I am looking at purchasing a 1993 audi 90cs quattro with 200,000 miles. my window problem seems to be similar to those posted except it seems that only one window doesn't work... the rear passenger side.
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I remember doing this years ago. Remove thermostat from the car and drop it into a pot and then pour boiling water over it. If it's good you will see it change shape as the bellows function. If this doesn't happen replace it. Just bear in mind that the Audi can't be driven without a thermostat, so if you have no other transport see if you can buy a replacement thermostat on a sale or return basis!
faulty thermostats show as two things
stuck close --overheating with in 10 minutes of driving
stuck open--- not reaching operating temperature with in 20 minutes of driving
the test is to remove it have test it as per instructions for testing thermostats
Are they blinking from the moment you start or only after it's overheating? Replacing the relay as well as addressing any other obvious stuff would be the first step. Check coolant level and condition, assure the pressure cap is good and there's no leaks.
First of all check the fan fuse to c if it's ok if it is then replace your fan switch on the side of the radiator cause that tells the fan when to come and it's a common fault on most vw cars if all else fails u will need to test and c if the fan is still working,u can check that by either putting direct power to the fans wiring if it does work then change the thermostat
I would definitely check the fuse panel (left side of the dash next to the driver's door). Inside the panel should be a list of fuse locations and ratings. Do you have an owner's manual? It should have the list, too. If this is not the problem, please post a comment here!