Trying to trace back temp fan switch connection - Defender Source
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Old May 18th, 2011, 03:54 PM
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Matthew
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Trying to trace back temp fan switch connection

I recently became owner of a 94 D90 V8. Just north of the water pump on the hose there is a switch with a two blade male connection. There is nothing connected to in nor can I find anything disconnected that needs reconnecting. Roversnorth helped me identify that it's a temp fan switch. I'm curious to get into the cooling side because my truck temp gauge will go straight to high heat when at idle after about 20 minutes of driving. When driving, the temp gauge is cooler and I don't get any real heat off the heater either. I'm going to replace the thermostat and refill coolant but I wanted to see if anyone could help me with this plug issue.

thanks
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  #2  
Old May 18th, 2011, 04:11 PM
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That switch is used for the early AC systems to control the AC condenser fan.
if you don't have AC, it just sits there doing nothing.
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Old May 18th, 2011, 05:12 PM
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Charles Galpin
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Matt your symptoms indicate you could have a bad fan clutch. Search on the forums for details but it's easy to test and see, one way being to see if there is any resistance when hot by carefully sticking a rolled up newspaper into the blades while running. If it easily stops the fan, you need a new one.

hth
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Old May 18th, 2011, 08:33 PM
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Daniel Hayes
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Originally Posted by ECR View Post
That switch is used for the early AC systems to control the AC condenser fan.
if you don't have AC, it just sits there doing nothing.
Yes, I believe it is the high temperature cut off switch (normally closed) disengaging your compressor clutch.....essentially turning off the AC until the motor cools down.
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Old May 19th, 2011, 12:45 PM
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I concur with all of the above.

Sounds like a bad fan clutch is causing your overheating problem. However, if you're also getting no output from the heater..... then also consider the possibility of a big air bubble in the cooling system. "Burping" the cooling system is pretty well covered if you do a forum search.

The temp switch... all modern A/C switches use them one way or another However, if you do an electric fan conversion, it's a very convenient option. Though you do have to change it for that use as the factory LR switch is a bit high of a temp for cooling fans. The good thing is a number of VW's used the same size temp switch, and lower temp options are available. IIRC I'm running a 180 degree switch right now.

-Hans
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