Hopefully, I'll have better luck with this than I did with the electronic issue I had over the weekend...

I was stuck in traffic this afternoon (parking lot on the highway , when I noticed my temp. gauge climbing. It got above 220, and I got a little concerned when I didn't hear the fan cut on. Rather than run the AC or defrroster (& put more of a load on my motor with an electrical quirk), I just cranked up the heat full blast, which seemed to cool it off slowly. My question is; what is the stock setting for the fan, and if it's around 230-240, how can I determine what's wrong? I just replaced the relay (in front of the left headlight bucket) a couple of months ago, and the fan comes on when I kick on the AC or turn on the defrost (which kicks in the AC compressor), so, I'm pretty sure it is good.

Thanks,

Hajii

Your gauge may not be accurate and reading higher than actual or your fan switch may be be bad. You can test the switch by pulling the connector off and shorting it to ground while the key is in the on position.

-John

Thanks, John. Just for clarification; the fan switch is on the intake, right?

Dave

It's on the intake near the thermostat housing (V6 engine). The stock fan switch is suppose to turn the fan on around 220 degrees. Don't go by the car's gauges as they may be off by several degrees.

gotcha. I tested the switch, and I had power to the connector,but when I grounded the connector, the fan didn't turn on. Although, it does come on when I turn the AC on (but, as I found out a few minutes ago, not when I turn on the defrost), so I'm guessing I need to replace that relay again...

Haji,
I guess because of it's location, that relay is prone to get damp, which leads to arcing and just poor reliability. I've taken the covers off a couple of them, and just cleaned them up. If you have the single speed fan & relay, they are cheap enough, but the 2 speed relays on my 84's are pretty expensive, so I always check 1st before I go buy a new one. Use some silicone to seal it back up.

not sure if you used the right connector in your test. The fan switch connector is only 1 wire, and is a simple ground only switch..

The V6 sensors in the manifold, left to right ECM temp sensor, radiator fan switch, and cold start injector switch:

[This message has been edited by Jncomutt (edited 06-09-2004).]

The '84 uses a two speed fan with a dual contact temperature switch in the manifold. My picture above shows the V6 manifold temp sensor arrangement. All power to the fan goes through the relays, but on an '84 it is possible to have one of the two sets of contactors go bad in the dual relay it uses. If the A/C turns on the fan, then at least on of the contactors in the relay is working, so the fan must come on eventually if only one of the two switches in the fan switch are still good.

JazzMan

Actually, it's a 4 cylinder, I grounded it to check the temp. light & fan, and only go the temp light. I'll try & clean up the relay, it's a single speed, so if it still doesn't work after that, it's only a $10 part around here.

Thanks for the help,

Dave

On the 4 cyl, the fan sw is horizontally screwed into the head, on the exh side, It is near #4 plug, and points directly toward driver's seat.

I stand corrected. well, I checked the switch, and the switch is bad. looks like I'm going to advance.

Thanks for your help, folks,

Dave