Switches on the thermostat housing - Defender Source
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  #1  
Old April 29th, 2009, 10:58 AM
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Switches on the thermostat housing

I have 2 (switches) on my thermostat housing. ones got a red dot and one a blue dot. I'm assuming I can use one of these to control my electric fan? I figured red was the hot, and blue was the colder, but I am pretty clueless.
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  #2  
Old April 29th, 2009, 02:55 PM
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sounds custom- defender 200 engines didn't use those. They should be marked somewhere as to what the temps open and closed are.
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  #3  
Old April 29th, 2009, 03:17 PM
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There are spots for two. AFAIK, one is meant to be for turning on the A/C cooling fan. I put my electric cooling fan sensor there.

Follow-up Post:

Found green and yellow...
http://forums.lr4x4.com/index.php?sh...2&#entry362632
Quote:
Yellow PRC3505 f100/94c
Green PRC3359 L115/109c

The yellow one is for the AC fans - the one closer to the engine, the one with a normally open contact. In theory, the contact closes at 100C and gets opened when temp drops bellow 94C.
(the green one has a normally closed contact and when it opens it breaks the circuit for the compressor clutch => it disables the A/C).
One turns on the electric AC fan, the other disables the AC system. Check the sides of the switches carefully. The temperature ranges may be marked.
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  #4  
Old April 29th, 2009, 03:18 PM
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Yeah, those are the temp safety switches for the AC. It is possible to run an AC without them, but better to do it with, for the added protection.
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Old April 29th, 2009, 03:40 PM
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While we are on the topic.... The threads should be 1/2" BSP, like the rad plugs, etc..... if you want to replace with something else.
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Old April 29th, 2009, 04:36 PM
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I swapped them form the 2.5, I want to run my electric rad fan from one of them, I assume the red one, But I will look for the temp range on them to check.
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Old April 29th, 2009, 04:41 PM
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I suspect the temp ranges will not be suitable - the low one will probably run the fan too often, and the high one will probably only turn the fan on after you are already f*&ed.
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Old April 29th, 2009, 04:46 PM
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thanks Jim
That makes sense, now I just have to find one in the middle if possible.
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Old April 29th, 2009, 05:05 PM
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No, you don't want the one in the middle, you want one that turns on at, say, 200 degrees. You just have to decide what that threshold is and then get the appropriate switch. I don't know if there is a stock rover switch that will do the job for you, but I'm sure there is a good solution that will bolt up.

Many BMW's have electric fans, and I know that some people swap out the switches to compensate for an old cooling system with decreased capability, hotter climates, etc.
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  #10  
Old April 29th, 2009, 09:12 PM
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Tom, i have a thread with very similar subject.

In my case (300Tdi), it's PRC3541 (F96/91C)
and PRC3366 (L104/98C).
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  #11  
Old April 30th, 2009, 11:31 AM
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Have a look first.... The 96/91 would be fine. That is about where I control my fan and it works well. The stock thermostat opens at 88C (190F) and closes at 83C (180F).
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