1990 Carat tintop Radiator fan operation with AC on

[vanjoe]

Can anyone please tell me how the radiator fan should function when the AC is turned on? What relays energize and the sequence that it operates. When I went on a trip in July the fan use to come on when I turned on the AC but now it doesn't. I installed a new resistor behind the headlight and new temperature switch in the radiator and that didn't correct them. The fan cycles fine during normal in town driving and AC not turned on. Any help is appreciated. TIA
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1990 VW Vanagon tin top weekender Carat
1998 Mercedes S420

"Why is there never time to do it right the first time, but there is always time to do it twice?"

"Back to the basics!"

[Farf]

Sounds like your 50 amp fuse (item 4) is blown, I'd start there.

https://www.thesamba.com/vw/gallery/pix/1673404.jpg

[crazyvwvanman]

There are several things that have to work before the rad fan will turn on by the AC on/off switch. First thing is, make sure the AC temp knob is turned to a cold enough setting.

Mark

[rmcd]

I found this helpful when trying to start troubleshooting.

http://www.gowesty.com/tech-article-details.php?id=74
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VW LT40 build. Like a Vanagon but 30% larger in every direction and 40% slower even in metric.
https://www.thesamba.com/vw/forum/viewtopic.php?t=749359&highlight=