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02 jetta wagon 1.9 tdi a/c does not run and radiator fans

Customer Question
run continuously while engine runnig...
02 jetta wagon 1.9 tdi a/c does not run and radiator fans run continuously while engine runnig and after shutdown even when engine is cold?
Submitted: 2 years ago.Category: VW
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Customer reply replied 2 years ago
Also ac pressure good at 85 psi, no diagnostic codes . Thermal rad switch is working properly.
Answered in 14 hours by:
9/20/2015
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: VW
Satisfied Customers: 23,266
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

It sounds as if the compressor may be disabled due to a coolant temperature sensor signal issue. If coolant temperature is high or the ECM has identified that the signal is implausible then it will run the cooling fan all the time for protection and can disable the a/c compressor. If the cooling fan is running with the key off though that would indicate a failure in the fan controller or a short to ground on it's control circuit.

With the engine cold use a scan tool to compare engine coolant temp to ambient and intake temp. If the temperature is incorrect then you either have a failed coolant sensor or sensor wiring/connection issue.

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Customer reply replied 2 years ago
My scan tool does not read sensors can I test with vom
Customer reply replied 2 years ago
Fan module replaced ,either original or new module do same thing running after key off.
Customer reply replied 2 years ago
What do you mean by short in control circuit, in module or external.
Customer reply replied 2 years ago
I assume coolant temp sensor is a thermistor what resistance value can I expect at 70 degrees f.
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

If the fan runs after the key is off then the fan controller is bad or it's control circuit is shorted to ground. That should be separate from the a/c issue. Did the replacement do the exact same thing as the old one immediately when plugged in?

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Customer reply replied 2 years ago
it did exact same thing fans on all the time.fans shutdown if module 14 pin connector is disconnected ,then fans will cycle on/off on thermal switch when car idling.
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

With the key off if you unplug the ECM will the fans shut off?

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Customer reply replied 2 years ago
Do you have a temp to resistance to ck coolant sensor?
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

The correct way to check coolant temperature signal is by using a scan tool. Testing the sensor's resistance isn't that accurate and doesn't account for the wiring. At 85 degrees it should be 1500-2,000 ohms; however if the fan runs without the key on then the coolant temperature signal is no longer in question because you have a failed fan controller or shorted control circuit.

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Customer reply replied 2 years ago
Ok please elaBorate on troubleshooting shorted control circuit if you can? I will rate u very highly if we can get to bottom of this nightmare. Thank you for your help
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I asked this morning if the fan turns off if you unplug the ECM while they are running with the key off but never heard back.

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Customer reply replied 2 years ago
Either way you will get good rating.i do appreciate your persiverance.
Customer reply replied 2 years ago
I was out for a bit in garage now testing fan module i/o 's
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Does it stop running with the ECM unplugged?

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Customer reply replied 2 years ago
Where is ecm located on tdi
Customer reply replied 2 years ago
I'm accessing ecm now I'll get back shortly
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

Ok.

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Customer reply replied 2 years ago
After shutdown pulling ecm plugs DOES NOT SHUTOFF FANS
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

You mentioned testing the controller's inputs and outputs. What were the results there?

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Customer reply replied 2 years ago
Hello .fyi ac not running and fans running continuously were caused by same issue. The ambient temp switch had 1325 ohms at 70 degrees. I jumped plug and car is fixed I appreciate your help and will pay the , 28 dollars but the fan module test procedure I found on Web found the issue
VW Mechanic: sprinkles08, ASE Certified Technician replied 2 years ago

I'm glad you got it repaired.

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sprinkles08
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