One mod I haven't done yet is lowering the fan turn-on temperature. I don't want to do the mods described in the tech section, because one of the switches is actually busted and leaking a little--I have to replace the switch. I figure I might as well replace both of them while I'm at it. The Hypertech switches look great, except for the price. So I was wondering, are there any less expensive switches out there? Maybe stock switches for other cars that would fit into a 350?

Thanks,
Jon88GTA

 

The fan switch for a 1987 Buick Regal VIN 7 brings the on temp down to 203degF, over 20deg cooler than your stock switch if I recall correctly.

Look on wrenchead.com or carparts.com for that application in a Borg Warner or Delco part and you'll be in good shape. Avoid the no-name stuff.

-Kevin

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1982 Z-28

See http://www.mycar.net/mafb/registry/detail.cfm?id=276 for details

 

Does that switch turn the fans on at 203 and off at what?? Around 180?? Are you sure that switch will fit in a V8?

 

I'm using one for a '93 GMC Suburban (350 TBI). It closes at 225*, which is alot better than the stock 243*. The connector for the 'burban switch is different, so some adaptation will be required.

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'87 IROC 5.7l TPI - original owner!

 

On temp is 203, off temp is ~190. In my application the switch only manages the aux fan, the ECM manages the primary fan.

I swapped one into my L98, no modifications necessary. Even plugged into the factory harness. Direct swap.

-Kevin

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1982 Z-28

See http://www.mycar.net/mafb/registry/detail.cfm?id=276 for details

 

Do you know of any lower temp switches, say around 190/180 on 180/170 off? I can't see spending $50 with S/H to get a Hypercrap switch again. The one I had went out after a few weeks. And it aint the driest thing to install eighter. And what is the part number to the GM 170 degree stat?

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1989 Iroc-Z L98 Original engine-58K miles!!

SLP 1 3/4 SS headers, Hooker Areochamber catback, no cat, BBK AFPR, Hypertech 160* fan switch, ported and gasket matched plenum, TB coolant bypass, relocated MAT sensor, screenless MAF sensor, K&N filters, Accel cap and rotor, Taylor SpiroPro 8mm wires, Bosch Platinum plugs, Mobil 1 Synthetic 15W50 motor oil, and more to come...
Best ET- 14.24@96.76MPH / 2.17 60ft on street tires with the crappy B/W 2.77 gears.

Homepage currently under construction: http://www.iit.edu/~wicktho/len

 

The 170-degree 'stat is AC Delco part number 10220957. You can order it from any GM dealership.

Jon88GTA

 

Any stat with a bit cooler range than 200-190

 

What is the "sensor" thats connected to the radiator??Its on the passenger side(on the tank)it seems like it goes to the fan relay..
Daz

 

I meant temp switchs with a lower range like closer to 190-180

 

MSI,

Autometer offers a fixed temperature switch that closes at 203°F and reopens at 187°F, part number 3246. I paid $20.99 for each of mine at the local speed shop. They might even be cheaper on-line or at an auto parts grocery store. They have a 1/2" NPT thread and no invasive sensing element to impede coolant flow. They're soo non-invasive that I was able to install an auxilliary switch on my '86 by drilling/tapping the water outlet without restricting flow from the thermostat. They should fit nicely in the right head opening.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

I just picked one up at the parts store for a late 80's mopar. It has a 1/2-14 NPT thread (fits into extra heater outlet on edelbrock intake). The fan goes on at 195-200, off at 180 (or so). It has 2 male spade terminals. i soldered "pigtails" to them and then epoxyied the pigtails in. It came oput excellent. I paid about $10 for the switch.

 

Is that only for dual fan cars or will it work on single fan cars too?


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1989 Camaro RS LO3 WCT5 "The Hose Queen" 0-60' 2.34 1/4 15.8@87mph
http://350.StreetRacing.org
ICQ: 61342629 AOL IM: BlackSunshineZ28

 

merf23, do you know what car that switch you got was for?

 

I am friendly with the guys at NAPA and they let me look through the books. It is a 1980's mopar. It is a 1/2-14NPT thread size with 2 spade terminals. They had 2 different ones listed with different temp ranges, but all were much lower than the GM ones i saw. I can stop down there this week and check if you cant find one. BTW, the discount parts stores (around here at least) dont have the books with pics and specs.

 

Did you find any info on that fan switch???