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Give us the year, engine code, trans type, model your car is and we can give you service manual testing info.
This info above, thanks.


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At this point, any scan tool; would be better then nothing, see if there are any trouble codes. Most auto parts stores; will lend you a scan tool or scan your car for free.

Compression testing:


Here is the overall service manual online; if you want to look up info, on your own: (note the table of contents; on the left, scroll down and click on links, to drill down to info you need)

NOTE: this free manual site; typically, asks for a donation; just click outside the box and dialogue box will disassper, give you access to the service manual website, once again.


If you suspect, your fans and cooling system; is not working as it should, check out this thread, to diagnose your cooling fans:


If there is anything else, you want help with; ask and we will try to help! Thanks.
 

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2001 Beetle Sports Edition
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Discussion Starter · #27 ·
At this point, any scan tool; would be better then nothing, see if there are any trouble codes. Most auto parts stores; will lend you a scan tool or scan your car for free.

Compression testing:


Here is the overall service manual online; if you want to look up info, on your own: (note the table of contents; on the left, scroll down and click on links, to drill down to info you need)

NOTE: this free manual site; typically, asks for a donation; just click outside the box and dialogue box will disassper, give you access to the service manual website, once again.


If you suspect, your fans and cooling system; is not working as it should, check out this thread, to diagnose your cooling fans:


If there is anything else, you want help with; ask and we will try to help! Thanks.
Thank you so much!! 👍👍👍
 

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I was checking out a website and it has some info, that might match with your cooling fans, acting up and going on, off. This maybe the classic low speed fan failure mode; requiring fan replacement. That being said; I would check the fan testing link i posted before and also, the fan control modules, are known to malfunction and act goofy as well.


Overview

The VW Golf MK4 uses electric looking fans with two speeds, slow and full. The slow speed is required by the air conditioning system. It runs continuously while the air conditioning is on.
The cooling fan motors include a series power resistor within their casing to provide the slow speed. It is a common failure that this resistor breaks, leaving only high speed operation. Without any air circulation, the air conditioning condenser heats up enough to force the fan controller to turn on full speed fan operation.
The owner of the car only notices this problem when full speed fan operation starts and stops intermittently while the air conditioning is on.


Video going over common failure modes of the internal relay contacts, sticking closed and cracked solder joints, etc:


Another example of how a defective fuse box and bad connections, an cause odd fan behavior:

 
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