can anyone help with a photo and part numbers for the switch in the passenger side head? I've got a 1988 5.7 IROC and the switch in mine has a two pin plug and all the ones I've found online are a single pin which I suspect is the one in the block near the knock sensor in earlier models

 

This is what the one in my car looks like





This is what the sites say will fit

 

The single is "correct" the dual wire is a replacement.

 

Heres the part numbers and fan"on"temperatures.
Part # TFS8 = 204 on
# TFS4 = 213 on
# TFS1 = 224 on
You should be able to have these part numbers cross referenced if necessary.


You can still use the stock 195* thermostat with these switches.


There are switches available from Jet Performance = # 60600 at 195* on and 185* off.
also
Hypertec = # 4028 at 200* on and 185* off.


I would use a 180* thermoset with either of them.

 

What was the part number for the grand national fan switch that is a direct bolt in for these cars? I think it comes on at 204 F which is what I would want before 220 on primary and 238 on secondary fans.

 

Hypertec stuff = was discontinued.
looks like they switched suppliers for 1 of the switches b4 they discontinued them.

http://www.summitracing.com/parts/rfw-ar34/overview/

 

What's wrong with the one 204 * "on" switch that I listed in the post above.

 

That may be one of them. I found this one I was looking for. ts-138 standard motor products.

 

How much is that switch ?


Summit Racing has it for around $83.00