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Fan relay (cooler engine)

Joined
Mar 26, 2002
Messages
812
Location
Midlothian, VA
Corvette
1981 white/blue interior automatic
Hey everyone. I remember a few posts about some sort of fan relay that you can buy from Mid America that will turn your fans on at a lower temp., however I cannot find the part in the catalog or online. Does anyone have a link for the part? Also, how hard is it to install? Thanks for all replies.

-Tatortot
 
D

Dave L.

Guest
It is located in the right front (passenger side) cylinder head (between the back two cylinders). It is a sensor,not a relay. Factory fan switch would activate at 238. The replacement will activate at 205 and cool to approx 190.
I researched my paper work and found I purchased mine from Mid-America (www.madirect.com)
in 2001. The part number is (was) 601972 and I paid $19.Call them to see if it is still available,I'm pretty sure it is. It does not come up on there website parts directory. Its very easy to install. You'll have to drain your rad to lower your coolant level. Hope this will help you out.
 
Joined
Mar 26, 2002
Messages
812
Location
Midlothian, VA
Corvette
1981 white/blue interior automatic
Thanks Dave! It helped a lot. I couldn't find it online either, so I guess I'll have to call them. About how much will I have to drain out do you think?

-Tatortot
 
D

Dave L.

Guest
22229stingray81 said:
Thanks Dave! It helped a lot. I couldn't find it online either, so I guess I'll have to call them. About how much will I have to drain out do you think?

-Tatortot

I'd just drain the whole thing. Just unscrew the drain plug (bottom of RH radiator tank) and let it drain for a couple minutes. After installing the switch,when you refill it,let the engine run with out the rad cap on and turn on your heater for about 15-20 minutes. This will ensure you have no air bubbles in your cooling system. I'm pretty sure when I called Mid-America (1-800-500-1500) about a year ago they still had that sensor in stock.
 

Low drag - High speed

Well-known member
Joined
Oct 24, 2003
Messages
201
Location
Okla-Frikkin'-Homa
Corvette
1995 and 1984 Red Coupes and grey 2007 GMC Sierra
My '84 has essentialy the same set up and I had, essentially, the same cooling problems. Even after I installed a new temperatrure switch, the car would overheat in traffic and over time I had to put in a new radiator and fan and relay and then the whole circuit went on the fritz and I was down to looking for shorts and bad fusible links. Never did get it fixed, but I just jumped the whole, overly complex and unreliable circuit and put in an on-off switch for the fan. Works like a champ and it's never overheated again.
 

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