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Discussion Starter #1
So Ive decided to go electric fans. Im doing the volvo/bmw temp switch setup. What I want to know is which switch to get. One has a 180/195F switch. The other has a 195/210F switch. I was going to use the low temp to trigger the low speed fan and the high temp to trigger the high speed fan. Which would be better for the stock t-stat?

Also am I going to have any problem with my ac? New fans come on as soon as you turn the ac on correct?

Any help would be great. I already have the fan and volvo controller just need the temp switch and an adapter.
 

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higher option is better

if this is for a fox mustang..........
 

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I'm currently running this on my daily driver....no issues at all. I run the 195 setup (thermo and switch).

Pm me your number and I'll shoot you a diagram on how i wired it.
 

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Discussion Starter #4
It is for a fox mustang. A 1990 5.0. ANd i was leaning towards the higher option espicially with the stock thermostat. I have a wiring diagram for it from another forum. Its storming outside so Im going to order the rest of the parts and hopefully I can get it all wired up soon.
 

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Discussion Starter #5
Well I have the parts on the way. Now I'm trying to decide if I should put the temp switch in t stat housing or in one of the radiator hoses? I've heard that if it's in the housing then it won't read true until it opens.

Also is there a way to figure out how to turn the high speed fan on by temp or when the Ac is turned on?
 

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Well I have the parts on the way. Now I'm trying to decide if I should put the temp switch in t stat housing or in one of the radiator hoses? I've heard that if it's in the housing then it won't read true until it opens.

Also is there a way to figure out how to turn the high speed fan on by temp or when the Ac is turned on?

won't read true? what is that supposed to mean?

there is a way to figure out the a/c or temp

I found a way to figure out.
 

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Discussion Starter #7
I do remember you saying something in another thread about installing a pressure switch in an ac line i believe that triggers the fan. Atleast I thought it was you that posted that. Ill have to go back and search and try to find it.
 

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I did.

that is how mine is controlled.
 

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Discussion Starter #9
Well I got my fans hooked up. Started to car to check for leaks and correct wiring. I didn't notice the ac on low. Needless to say the purge valve on top of the compressor sprayed before the low fan even came on and scared the crap out of me. According to the stock gauge which is all I have to go by the needle never goes above half (where it was with the mechanical fan). Also the low speed fan is enough to cool it. The high speed hasn't even been activated yet. I drove it hard and let it idle about 20 mins and the Lowe speed kept it cool. Now just have to do clean up some wiring.
 

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that is not a purge

its a relief

you lost charge
and possible relief is done
 

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Discussion Starter #11
Ahh well I'll look into it and fill the system back up if it needs it. As far as I know the car has the stock thermostat which is what like 192? And the temp switch I have has the fan kick on at 195. So I wouldn't haven't thought it would have blown the relief valve :( but I gotta have the ac so I'll fix it.
 

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you will need to pull the charge, re weigh the correct amount,.

and I suggest you replace the relief, it usually can reset, but sometimes not.

What does t-stat temp matter here?

the fan needs to be triggered by discharge pressure.
 

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Discussion Starter #13
Yeah I have the stuff to recharge it. Vacuum pump, manifold gauges and all. Ill look into the relief valve replacement.

And what I meant was I don't understand why then valve popped now but it didn't before when I had the mechanical fan on there that's all. I knew it was based on pressure just thought maybe that pressure was swayed by temperature.
 

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relief blows at ~450psig

therefore, your fan is not good enough, or it didn't come on, or you pressure switch is faulty
 

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Discussion Starter #15
Ah it must not have come on soon enough. The fan comes on and the low speed cools the engine enough so that the high has never even kicked on. I'm going to find a place tomorrow that will install a port on the ac line.
 
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