tie_one_on

The original auxiliary fan switch that screws into the right hand side of the block is set to turn the fan on at 235F.
Is there a switch that would turn it on at something lower? Like maybe 200F?

rodj

Ecklers and others have switches with various on / off settings
Exp
http://www.zip-corvette.com/Zip/prod...D05DA93F138BAA

hbarclay

I also have an 85 and had the same issue. I installed a switch that turns on at 200 and off at 185. The good news is that it solved my original problem of the switch never turning on, the bad news is that it is often switched on when I don't really need it. I suspect the temp in the head is unlikely to ever get below 185 once warmed up, so once it switches on it is on for the duration.

I'm now trying to decide whether to try to find a switch with a slightly higher turn on setting, or just putting in a manual switch to turn it off when I don't need it.

Anyone know where to find a switch that turns on at about 220 and off at around 200?

Demonic85

You can have the prom in your ECM tuned to turn them on sooner which is the easiest way if your doing mods anyway. If you have a completely bone stock car I wouldnt bother messing with anything like that.

Muffin

Not sure how easy it is to reprogram the 85 chip. Nor do I know many folks who do it. I do know, as the Demon said, unless you are big into mods stock works very well. I but a manual overide on my 85, haven't used it yet.

tie_one_on

Is it a good idea or bad to put a 160 thermostat and a 200 cooling fan switch in a 1985?

What are the pros and cons of each?

For the pros I would think running the engine at a cooler temperature would be better for longevity.

cumbercr

Personally, I thought 160 was a little cool for the thermostat. I went with a 180. I then installed a new fan switch that comes on at 195 and off at 180. I tied both fans to the switch, eliminating the need for a chip change. I am also using a Dewitt high performance radiator. So my temperature rarely reaches 200. My 85 has a factory oil cooler, so the lower water temp lowers the oil temp. That's a benefit.

rodj

The lower thermo only means engine takes longer to reach operating temp. More cold running / more wear on engine. Once the themrostat is open it has no affect on engine running temp unless temp goes below.
http://www.corvetteactioncenter.com/...-180-a-14.html
or if you have some time to kill
http://www.corvetteactioncenter.com/...-vs-180-a.html

powerpigz-51

On my 85....I have an adjustable switch that I ordered from JC Whitney, it works just like a thermostat so you can set it wherever you want. Mine comes on at 200 ,(not sure when it shuts off) I have a 185 thermostat with two 1/8 inch holes drilled in it. My aux fan comes on at stock temp 235 I believe.

tie_one_on

powerpigz-51. Do you have a part number or link to this part?

kenmohr

Went to auto zone and got a Camaro switch # BW TFS4 or FS4 (same one). Turns on 215* off 205*. Works great. Only runs when it is needed and doesn't run the fan needlessly

powerpigz-51

jcwhitney.com http://www.jcwhitney.com/autoparts/I...D:100000178925 part #zx378602b

tie_one_on

hey kenmohr, what year eand engine camaro was that switch from?

hbarclay

I have the same question. My local Autozone could confirm that is a good part number, and even had a picture of the switch, but they did not have it and supposedly could not get it.

After going home I looked up a 1990 IROC-Z Camaro on their web site and the radiator fan switch looks like the same part. They show it is available for special order at $5.99. That's cheap, if there is any chance this is the right part that would be worth trying anyway.

kenmohr

If I said autozone that was a misquote. It was Advavce Auto.

Auto zone couldn't help me so I went to Advance.

Borg Warner site info

http://www.bwdbrand.com/web_app/catalog/bwd_bgBulk.aspx

SemiDryChicken

How did that work out? Using a Fan switch for a Camaro? What year Camaro did you pick for it? Didn’t throw any check engine lights?

kenmohr

A GM tech told me I was wasting my time. He was right. The main fan keeps the car under control and the aux never turns on.

85WHITEZ51

I just wired in a toggle switch that grounds the relay for the aux fan. When I get stuck in traffic I flip the switch and then turn it off when I can get moving again. Just helps keep the car cool while sitting still with the AC on in a 100+ degree day.

Some info on how to do that here:
https://tech.corvettecentral.com/201...modifications/

playsdixie

Interrupt the wire from the sensor in the block to the fan....run the wire to a grounded three way toggle switch......it'll turn on when you want.....however.....I live in S Fl.....I see no difference when it's on.......on my 85..