How To Repair Evaporator Coolant Corola 2001

On many of today's cars, the commuter has the luxury of setting a desired temperature inside the vehicle through the ac command panel. Oft, this feature is available on both passenger and commuter sides. The operation of this luxury feature is controlled past a very pocket-sized sensor chosen the evaporator temperature sensor or EVAP temperature switch.

This component has a very simple job: simply monitoring the temperature of the inside of the vehicle and relaying this data to the vehicle's ECM, which tells the Air-conditioning to continue flowing cool or warm air in the heater to reach a desired temperature setting. Typically this component is installed directly on the AC evaporator, as it accomplishes its job by monitoring the temperature establish in this component.

The Air-conditioning evaporator is typically located behind the firewall of the engine compartment, tucked in tightly behind the dashboard likewise. This location makes it very time consuming for a mechanic to achieve equally information technology will require the removal of most of the dashboard.

If the sensor detects that the temperature is approaching high temperatures, the AC organization increases menstruation through the organisation to increase cooling. It reduces catamenia when it detects that the evaporator is cold to conserve power and prevent information technology from freezing over. When the switch fails or has issues, it hinders the performance of the AC organization and even causes it to malfunction.

Since it'southward very difficult to attain, this job is typically completed by ASE certified mechanics or larger repair shops with extensive resources at their disposal. Nonetheless, the chore itself of replacing the sensor is incredibly simple (once the dashboard has been removed).Mutual vehicles that experience failure of this component frequently include the Ford Focus from 2003 to 2008; however, information technology tin neglect on any vehicle over a menstruum of time.

Note: Since dash removal is extremely complex and specific to each vehicle make and model, all mechanics should refer to the vehicle's service manual for specific instructions on removing the dashboard.

Part 1 of 3: Determining the symptoms of a bad EVAP temperature sensor

Almost ac bug are related to a sensor or electric issue; especially in modern vehicles. In many cases, when the Ac stops blowing hot or cold air, it's due to a malfunction of the EVAP temperature sensor. The best mode of determining that this component is malfunctioning will exist to complete an error code download with a scanner. The OBD-II code (P-0535) indicates that an Evaporator Temperature Sensor failure has occurred. Across completing an OBD-Ii scan, a bad or declining evaporator temperature switch will produce a few symptoms that can warning the driver of a potential issue that should be serviced.

Noted below are a few of the common alarm signs that a trouble with the EVAP temperature sensor exists.

No cold air from the Air-conditioning organization: Unremarkably when a vehicle has a coolant leak on a closed loop organisation or is running depression on refrigerant, the air conditioning system slowly stops blowing common cold air into the vehicle. However, when this function stops instantly, it'due south typically due to a problem with the temperature sensor found in the Air conditioning evaporator. When this sensor fails, information technology does not ship authentic information to the ECM; which triggers the error lawmaking and, most of the fourth dimension, will disable the AC organisation.

Air conditioning temperature is inconsistent: On the lines of the warning sign to a higher place, inconsistent temperature is oftentimes an indicator that the sensor is starting to fail. In this instance, the sensor will occasionally send correct data, causing the AC system to piece of work fine. Withal, if the temperature raises and lowers often without adjusting the temperature setting on the commuter or passenger side, it usually means the sensor is starting to neglect. If this occurs, you'll take to replace the sensor.

The AC compressor does not work: Some other error code that commonly can be mistaken for an Air-conditioning compressor failure is P-0533, which indicates that the excursion to the Ac compressor is too loftier. In this case, the compressor itself is fine, but the usual suspect is the evaporator temperature sensor located nether the dashboard.

Part 2 of 3: Replacing the EVAP emissions control canister

Materials Needed

Boxed end wrench or ratchet wrench ready(s)
Flashlight
Flathead and Phillips head screwdriver
Replacement EVAP temperature sensor
Condom glasses
Specialized dash removal tools
Tip: Most service manuals signal that this chore takes between five to 7 hours to complete. The majority of this time is spent removing dashboard and interior components and reinstalling them. Make sure you lot requite yourself plenty of time to complete this task in one twenty-four hour period.
Alarm: This job requires the removal of many electrical harnesses that connect to gauges and sensors underneath the nuance. Information technology will also typically include removing the steering bike from the assembly located underneath the floorboard. If you lot don't experience comfortable with this, do not endeavour to consummate this job.

the evap temperature sensor located near the floorboard of the driver side

Step 1: Determine the location of the sensor. Each vehicle that utilizes an EVAP temperature sensor has a unique location and process for replacing this component.

By purchasing a service manual, you can determine where the sensor is located and the precise steps needed to supervene upon this component.

vehicles battery being removed

Footstep 2: Disconnect the vehicle'south bombardment. Locate the vehicle's battery and disconnect the positive and negative battery cables before proceeding.

Step 3: Get detailed instructions on removing your vehicle'southward dashboard. In guild to proceeds access to the EVAP temperature sensor, you lot'll accept to remove the dashboard and many supporting components.

Near vehicle manufactures sell a service manual for each make, year, and model vehicle they sell. Information technology'south brash to purchase this manual and look up the verbal instructions for removing the dashboard.

Step four: Remove the dashboard. The following are general steps that typically demand to exist completed, but you lot should follow the steps outlined in your service manual.

Pull the center panel and remove the center trim console. Remove the center pull tray and unplug the cigarette lighter harness. Remove the eye shifter cover and the shifter (while removing the shifter from the linkage). Remove side nuance panel, the door spill plates, and weather stripping, as well as the steering wheel from the middle steering shaft. Finally, remove the instrument cluster and any electric cluster harnesses.

The exact steps for removing each of these components will be noted in the vehicle'southward service manual and should be followed exactly to ensure that other electrical or mechanical components are not damaged and are reinstalled correctly.

Step five: Gain admission to the Ac condenser. On most domestic and strange cars, trucks, and SUV'southward the AC condenser is located deep inside the vehicle's dashboard and behind the firewall.

It's unremarkably located on the rider side on most cars, trucks, and SUV's. Most of the fourth dimension, the sensor is located towards the rear of the condenser (or closer to the rear of the vehicle as opposed to the front stop).

evap sensor being removed by hand

Step half dozen: Remove the EVAP temperature sensor. About sensors are screwed into the AC condenser and held onto the sensor by a secondary clip.

To remove the sensor, you'll demand to remove the support clip first. After the clip has been removed, you can unscrew the sensor by pressing down and turning the switch to the left.

Step vii: Remove electrical harness from the former EVAP temperature sensor. The EVAP temperature sensor has an electric harness attached that powers the unit and sends signals to the vehicle's ECM.

To remove this harness, depress a small clip that is located on the back of it with a very modest flat-blade screwdriver. One time the tab has been depressed, you can hands remove the electrical harness.

Stride 8: Remove the old EVAP temperature sensor from the vehicle.

Step 9: Reinstall the electrical harness on the new sensor. Once yous've removed the old sensor, the replacement steps are in direct opposite society.

The first stride in the installation process will exist to reattach the electrical harness to the new sensor.

successfully installed evap temperature sensor circles

Step 10: Reinstall the EVAP temperature sensor. Screw the new sensor into the Ac condenser, turning it to the right.

Footstep 11: Reinstall the support clip. In some cases, you'll have to reinstall the support clip on top of the sensor.

If this is the case, merely press the prune onto the back of the sensor. It should easily snap into place.

Step 12: Supplant all dashboard hardware, attachments, and electrical harnesses. Following your service manual instructions, supervene upon dashboard components in the verbal order you lot removed them.

Pay special attention to reattaching electrical harnesses in the correct position and to the right attachment.

Part 3 of 3: Testing the repair

Footstep 1: Test starting time vehicle. Clear mistake codes with scanner.

Earlier y'all complete the examination drive or fully test the performance of the air conditioning, it'south of import to start the vehicle and clear any error codes that previously were downloaded. This will give you lot a "clean slate" in which to test the new EVAP temperature sensor.

Footstep two: Starting time the vehicle. Permit it warm up to operating temperature

Footstep 3: Check the dashboard to verify that the check engine light does not come on. If it does, you lot should close the vehicle off and complete a diagnostic scan.

The error codes must be cleared on most vehicles after completing this service.

Step 4: Turn on air conditioning system. Prepare the temperature at the lowest possible temperature.

After about five minutes, check the vents on the Air-conditioning system to ensure they are bravado common cold air.

Footstep 5: Plough AC organisation off. Keep the engine running and activate the heater function on the temperature controls and turn up to 80 degrees (if possible).

Pace 6: Verify that hot air is blowing into the cabin.

Step 7: Perform a route test. Take the vehicle on a 10 mile road exam with the air conditioning set to its everyman setting and return dwelling afterward verifying the AC works again.

As you can see by reading the steps above, once you proceeds access to the EVAP temperature sensor, the replacement job is actually elementary. Withal, the difficult part is removing the dashboard, which should only be completed past a certified ASE mechanic. If you've read these instructions and still don't feel 100% confident in completing this repair, please contact one of YourMechanic'due south local, ASE certified mechanics to complete the evaporator temperature sensor replacement for yous.

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