Symptoms of a Bad or Failing AC Control Module, Signs of a Bad or Failing AC Compressor Relay, How to Troubleshoot a Broken Car Air Conditioner, Boxed end wrench or ratchet wrench set(s). Before you complete the test drive or fully test the operation of the air conditioning, it's important to start the vehicle and clear any error codes that previously were downloaded. The most popular service booked by readers of this article is Evaporator Temperature Sensor (Switch) Replacement. Discussion Starter • #1 • Sep 29, 2016. There are three good youtube videos showing the dashboard disassembly.Shortest service time video: Longest service time video following Ford instructions (by the book): Workaroundon a similar vehicle (Lincoln MKZ): Did you make this project? It is a part of the vehicle’s AC system, and as its name implies, detects and monitors the temperature of the AC system’s evaporator. Replace the thermistor if the resistance readings are off by more than 10 percent. The pictures show the resistor assembled. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. If you want to bypass it you will need to go right to the sensor connector or back on the wiring as far as you can go to the sensor and bypass there. Question Once you've removed the old sensor, the replacement steps are in direct opposite order. If you've read these instructions and still don't feel 100% confident in completing this repair, please contact one of YourMechanic’s local, ASE certified mechanics to complete the evaporator temperature sensor replacement for you. Since it's very difficult to reach, this job is typically completed by ASE certified mechanics or larger repair shops with extensive resources at their disposal. Finally, remove the instrument cluster and any electrical cluster harnesses. If this is the case, simply press the clip onto the back of the sensor. Most sensors are screwed into the AC condenser and held onto the sensor by a secondary clip. Seems to be staying in place just fine for now. Following your service manual instructions, replace dashboard components in the exact order you removed them. Most of the time, the sensor is located towards the rear of the condenser (or closer to the rear of the vehicle as opposed to the front end). $3 instead of $900 to Ford! We use cookies to give you the best possible experience on our website. This rapidly depressurizes the refrigerant, causing its temperature to drop dramatically. If this is your case, the wires must be chopped off in order to guarantee the good resistance measurement. Screw the new sensor into the AC condenser, turning it to the right. Works perfect. I found advice on how to cut the HVAC housing to gain access to the sensor which eliminates the need to remove the entire dash!! Evaporator Temperature Sensor (Switch) Replacement Cost, The statements expressed above are only for informational purposes and should be independently verified. Do the wires need to be cut going to the old sensor? I assume that would only be true for cars with the automatic temperature controls. I cut the wires going to these pins and installed it. The evaporator temperature sensor or switch is a component commonly found on many road going vehicles. 1 year ago. When using AC on very cold days, the evaporator may ice, in this case you have only to shut the AC off and let the ventilation working. In order to gain access to the EVAP temperature sensor, you'll have to remove the dashboard and many supporting components. The evaporator temperature sensor tells the PCM or ECM the temperature of the evaporator and keeps the evaporator core from freezing .It is usually located inside the hvac case underneath the dash, mounted on the evaporator core. I put the resistor in to fix the ac problem and read a post that someone lost the heater after doing so. Am I missing something?Anyway, thanks for the info. Worked perfectly, 2008 Fusion 2.3 fwd. It should easily snap into place. Tried this on my 2007 Ford Fusion that has manual environmental controls. If there is power then the compressor is bad. Pull the center console and remove the center trim panel. Want Answer 0. Want to bypass evap temp sensor with resister. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics. I put a DPDT switch in so I could run ac thru the resistor in summer and flip the switch to run thru the original sensor for the winter. Extremely polite, came early, fixed the problem fast and was extremely tolerable when I was having difficulties with my bank. I have easy access to the connectors behind the glove box. Check here for special coupons and promotions. and cycles the compressor to keep the evaporator just above the freezing point. Set the temperature at the lowest possible temperature. Step 9: Reinstall the electrical harness on the new sensor. Looking the backside of the connector blue or green (wire side), the pins will be the third and fourth from left to the right on the up row. Made with ♥ in Silicon Valley. If there is not... evaporator temperature sensor replacement. After the clip has been removed, you can unscrew the sensor by pressing down and turning the switch to the left. Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. The exact steps for removing each of these components will be noted in the vehicle's service manual and should be followed exactly to ensure that other electrical or mechanical components are not damaged and are reinstalled correctly. Darth 2: a 3D Printed Animated Darth Vader Helmet. Ford recommends the replacement of this sensor, to do that, the complete dashboard removal is mandatory. Step 4 Mechanic's Assistant: Have you checked the connectors on the sensor itself? Now a cold gas, the refrigerant passes through the evaporator, causing that part's metallic core to become extremely cold. Also, did it screw up your heater at all, as others have talked about? Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. The good resistor is shown on the chart. After the … I can’t find a wiring diagram that identifies the two pins used by the sensor. Thanks, trying to fix my kids A/C without breaking the bank. Fast, free online quotes for your car repair. In some cases, you'll have to reinstall the support clip on top of the sensor. In some cases the thermistor will open (resistance=infinite) in others it will show the problem only when moisten, it will cause the AC compressor shut down. I have a 95 LeBaron convertible where the evaporator temperature sensor must have failed and was jumpered/bypassed at the connector. Step 3: Get detailed instructions on removing your vehicle's dashboard. Let it warm up to operating temperature. I do not see why with manual controls I would have an issue with the heater or overworking the compressor. Step 1: Test start vehicle. Pay special attention to reattaching electrical harnesses in the correct position and to the right attachment. Typically this component is installed directly on the AC evaporator, as it accomplishes its job by monitoring the temperature found in this component. Also if I just slide the resistor in with the wires and pull it out when it starts to get cold will that work? I could not get the wire to come out so I ended up just pushing the wires from the transistor in as far as I could. I started up my car and was thrilled to see that my once super chilling A/C was again pushing out frigid air. This little blue and white box is the A/C evaporator temp sensor assembly. The control module will determine if the evaporator core is too cool, too warm, or just right. If the refrigerant is full then the problems is more than likely electrical or the compressor failed. Share it with us! sensor. Inspecting your car AC yourself before having it repaired can save on cost. Remove the center pull tray and unplug the cigarette lighter harness. Workaround that avoids the replacement of the AC evaporator sensor from all Ford Fusions up to 2012. on Introduction, I have a 2006 Ford Fusion it does it have the second wire on the hardest which one should I connect to, Question As the air passes the sensor, it reads the temperature and compares that reading to the setting on your thermostat. No cold air from the AC system: Usually when a vehicle has a coolant leak on a closed loop system or is running low on refrigerant, the air conditioning system slowly stops blowing cold air into the vehicle. The majority of this time is spent removing dashboard and interior components and reinstalling them. 2011-16 Ford f series ac fix bad evaporator temperature sensor Disassembly of the glove box pressing it on both sides. Remove the center shifter cover and the shifter (while removing the shifter from the linkage). Clicking this will make more experts see the question and we will remind you when it … If you don't feel comfortable with this, do not attempt to complete this job. As you can see by reading the steps above, once you gain access to the EVAP temperature sensor, the replacement job is really simple. - an Electric Go Kart Homeschool STEM Project, Concrete & Wood Counterweighted Mic Stand. I did a quick check and I think you are looking for P/N 4644919, which is for-sure discontinued. 2021 Order A/C Evaporator Temperature Sensor for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. on Step 4, HelloI am trying to follow as instruct but in my car ford fusion se 2012 there is no cable in the third pinI attach photo describing problem, Question 2 years ago, I'm pretty sure it would work but it's probably still going to freeze up because it's not going to get an actual system temperature reading, Question Press the Up/Down buttons... Hello. Step 4: Remove the dashboard. Question To remove the sensor, you'll need to remove the support clip first. I installed a 37k ohm resistor between pins 13 and 14. On most domestic and foreign cars, trucks, and SUV's the AC condenser is located deep inside the vehicle's dashboard and behind the firewall. The AC compressor does not work: Another error code that commonly can be mistaken for an AC compressor failure is P-0533, which indicates that the circuit to the AC compressor is too high. If this occurs, you'll have to replace the sensor. The air conditioning system has an evaporator temperature sensor that fails when there is no cold air or the air conditioning is inconsistent. Step 7: Perform a road test. 1 year ago Repairs covered by 12-month/12,000-mile warranty. )I noticed some people discussing concerns that they would not have a working heater in the winter or that the compressor would be running constantly and never getting a break. It is possible that this could be related to your mass air flow sensor on your 2001 Honda Passport. In this case, the sensor will occasionally send correct data, causing the AC system to work fine. The cycling switch or the evap. You might try moparpartsgiant.com and enter your vehicle data. on Introduction. However, the job itself of replacing the sensor is incredibly simple (once the dashboard has been removed).Common vehicles that experience failure of this component frequently include the Ford Focus from 2003 to 2008; however, it can fail on any vehicle over a period of time. Clear error codes with scanner. It's commonly located on the passenger side on most cars, trucks, and SUV's. Great information. Did the heat still work? The service costs around U$ 600 and the sensor around U$ 20. © This video will show you how. Thanks for all the info on the ac evaporator sensor problem. When this sensor fails, it does not send accurate information to the ECM; which triggers the error code and, most of the time, will disable the AC system. The former converts gas to fluid, while the former converts fluid to gas while absorbing hea… I bought a new sensor from the dealer but it is not like the one in my 2006 2500 quad cab. A car air conditioner can stop working for different reasons. Step 11: Reinstall the support clip. A problem that Ford should take care in guarantee considering the poor quality of the sensor used and because it is a recurring problem on several v… The operation of this luxury feature is controlled by a very small sensor called the evaporator temperature sensor or EVAP temperature switch. If it does, you should shut the vehicle off and complete a diagnostic scan. Did you try this and if so how did it work? Locate the vehicle's battery and disconnect the positive and negative battery cables before proceeding. Want to know how to get the air working without removing the dash to change the sonsor Posted by bfinn89 on May 21, 2012. Step 2: Start the vehicle. Sensor: Workaround that avoids the replacement of the AC evaporator sensor from all Ford Fusions up to 2012. So no other circuits are effected. If the sensor detects that the temperature is approaching high temperatures, the AC system increases flow through the system to increase cooling. It's advised to purchase this manual and look up the exact instructions for removing the dashboard. 2 years ago As the air is sucked through the return vents, the air passes by the sensor and the coils. Step 6: Verify that hot air is blowing into the cabin. 7 months ago, I have a 2012 ford fusion SE with a blue connector. I have a light blinking on my AC control panel and my mechanic told me the code is "bad evaporator temp sensor… Tip: Most service manuals indicate that this job takes between 5 to 7 hours to complete. With all the variance of cable colors and pins being used, I wasn't sure exactly which ones to use. My ac is now putting out 57 degrees and 43 on ac max. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially vehicles made since 1996 up to present. Wires BU-BN (blue/brown) and VT-BN (violet/brown) are the wires connected to the temperature sensor (thermistor). Works fine cost less than 3 bucks. Take the vehicle on a 10 mile road test with the air conditioning set to its lowest setting and return home after verifying the AC works again. Step 8: Remove the old EVAP temperature sensor from the vehicle. Though generic, specific steps may vary depending on the make, model, year, and powertrain configuration of the vehicle. Also a 2 wire gray cable will come from this box and down into the evaporator box. It will also typically include removing the steering wheel from the assembly located underneath the floorboard. What if I put the motorcraft evap temp sensor under the glove box and connect it to pin 13 and 15 will it work instead of the 37 k ohm, so I do not have to worry about freezing the evap or the heater not working. The photo sensor is located at the right of defrost nozzle. on Step 4. This will give you a "clean slate" in which to test the new EVAP temperature sensor. In this case, the compressor itself is fine, but the usual suspect is the evaporator temperature sensor located under the dashboard. There is no 3rd pin, Question Basically, the A/C evaporator works in the opposite sense as the condenser. The evaporator temperature sensor or switch is a component commonly found on many road going vehicles. Once the tab has been depressed, you can easily remove the electrical harness. Expedited shipping availability may vary. What exactly did you mean when you said you used a 15k and 22k in series? Beyond completing an OBD-II scan, a bad or failing evaporator temperature switch will produce a few symptoms that can alert the driver of a potential issue that should be serviced. Which wires pins should I use? The functionality of the A/C evaporator temperature sensor is crucial to the proper operation of your HVAC (Heating, Ventilation and Air Conditioning) system. But heater blows ouside air temp, so I installed a DPDT switch so that in winter it will be hooked to evaporator senser and flip switch in summer to read through resistor. The ac works fine, but not that its getting colder I find the heater is not working regardless of switch position. LEARN MORE. To remove this harness, depress a small clip that is located on the back of it with a very small flat-blade screwdriver. Step 2. The EC light was on because of the evap sensor----wrong--the EC light was on because of 1241 low refrigerant level and the low refrigerant level produced a high evaporator temp which you thought was a bad sensor so you went out and wasted your money on a new sensor-----now you haven't solved the problem--- you have a leak--go to an AC shop have them evac the system and see if it will … YourMechanic All rights reserved. Most vehicle manufactures sell a service manual for each make, year, and model vehicle they sell. Mounted on the evaporator core, this thermal sensor measures the temperature of the evaporator core constantly, and communicates the temperature back to the air conditioner control module. These coils are inside your air conditioner unit. This component has a very simple job: simply monitoring the temperature of the inside of the vehicle and relaying this information to the vehicle's ECM, which tells the AC to continue flowing cool or warm air in the heater to achieve a desired temperature setting. temp. Any ideas?? thanks. (Any tips for dislodging the wires so I can more solidly connect the resistor wires legs to the wires would be appreciated. Howdy, I have a 2007 Jeep SRT8 and I'm having A/C issues and I'm trying to find out where the evap temperature sensor is located on my jeep, normally I'd just start taking everything apart until I found it but the jeep is a real pain so I'm hoping someone here knows the location and if there is an easy way to change the sensor out. I would check for power first at the compressor. Answer 7 months ago, Which wires did you use? Our certified mobile mechanics make house calls in over 2,000 U.S. cities. On many of today's cars, the driver has the luxury of setting a desired temperature inside the vehicle through the air conditioning control panel. It's important that they not be loose or corroded. However, the hard part is removing the dashboard, which should only be completed by a certified ASE mechanic. on Step 6. When the switch fails or has issues, it hinders the performance of the AC system and even causes it to malfunction. I saw that some people with the 2006 Fusion had used the 2nd and 4th pins on the top row so I did that. Step 7: Remove electrical harness from the old EVAP temperature sensor. Remove side dash panel, the door spill plates, and weather stripping, as well as the steering wheel from the center steering shaft. hi, im looking to bypass the evaporator air temp sensor on a 2009 ford fusion with single manual climate control. Warning: This job requires the removal of many electrical harnesses that connect to gauges and sensors underneath the dash. I can't find the 37k resistor either. 1 year ago, I have a 2012 Fusion I see how this works and all but is there a way to do this and still have heat come winter time? Any Chance this will work with a 2013 Ford Fusion Titanium? 1 year ago This location makes it very time consuming for a mechanic to reach as it will require the removal of most of the dashboard. When the remote start front defrost feature is turned on, your front defroster will begin operating when the engine is turned on via remote start. Switch is installed in glove box. Step 8: Remove the old EVAP temperature sensor from the vehicle. The OBD-II code (P-0535) indicates that an Evaporator Temperature Sensor failure has occurred. Keep the engine running and activate the heater function on the temperature controls and turn up to 80 degrees (if possible). The AC evaporator is typically located behind the firewall of the engine compartment, tucked in tightly behind the dashboard as well. Noted below are a few of the common warning signs that a problem with the EVAP temperature sensor exists. When When we are discussing ABS systems it is good to note the year and make of your vehicle because ABS systems have evolved quite a bit over the years, but you also have to know how the ABS system... Common reasons why a car AC system makes a rattling noise is due to a failing AC compressor, worn serpentine belt, or worn out AC compressor clutch.