VW Eurovan Cooling Fan Inoperative

This is a 2003 Volkswagen Euro van that came in with air-conditioning not working. Vehicle didn’t have any engine temperature problems just blowing warm air from the AC. After checking the manifold pressure’s seeing that the freon was not the problem and the AC compressor is working good but there is excessive high pressure on the high side. This tells me that the condenser is not working and easy enough cooling fans were not coming on when you turn the air-conditioning on. Now to diagnose the cooling fan circuit. Volkswagen uses track wiring diagrams which are pretty confusing to try to read.  If you run into this problem go directly to the fan resistors they are probably burned up replace them before you try to diagnose any other cooling fan electrical problems. Otherwise power will backfeed and you will get weird test results that will confuse you. It’s as simple as  jumping across the resistors with a jumper wire and the fans will come on right away but don’t run them too long there’s no resistance, they will get hot  running full speed. Here’s  a pic of what the burned up fan resistors look like.  Thanks for reading and good luck fixing your vehicle.  Contact us to schedule an appointment for questions please comment below cheers 😀

VWFanResistors

Burned up VW cooling fan resistors

This post was written by: Martin Hand

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Martin Hand

About Martin Hand

ASE Certified L1 Advanced Mastertech. Martin Hand has over 15 years experience in Asian and European Import Auto Repair. Specializing in electrical diagnosis, engine performance, AT/MT transmission repair/rebuild. Martin is also pursuing a degree in Computers Science & Information Systems starting at Portland Community College while he plans to transfer to OIT. Certified in Java application level programming, experienced with other languages such as PHP, Ruby, JavaScript and Swift. Martin has future plans of automotive diagnostic software development.

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