Temperature Problems

[roadierfl]

My car is running at 3/4 guage - right on the white line. It started happening 2 days ago. I bought a new cap and tried that, didn't make a difference. The water pump is less than a year old, and upper and lower hoses are hot. It doesn't rise above the line,
but it only drops just below it when I'm moving.

Here's the strange part. If I run the defroster on the climate control, within 10-15 seconds, the temp drops to 1/2 guage.
As soon as I turn it off, it starts to climb to 3/4 guage again.


Thermostat? Temp switch?

[fast924S]

Sounds like both the fans are not comming on at the same time

[roadierfl]

I thought both fans only came on when the AC was on?

Only one fan runs without the AC, but both do when the AC is on. Is that normal?

[fast924S]

On mine both fans run when it gets hot, and I think both do when the AC is on, But Im nit sure since I removed my AC but Im sure someone else knows

[carsonmx114]

i know i sound like a broken record, but i had the same problem and i figured out after replacing several parts that i had a bad ground on the back of the motor. my car would never run in the red, it just started showing hoter on the gauge than it had been. try running a temperary ground from your negative post to the engine with a pair of jumper cables, and see if that effects your gauge.

[roadierfl]

Thanks for the suggestion......seems the first response was right though (but I'll DEFINATELY keep the ground thing in mind for when I pull the motor)...the second fan doesn't run.

I found the fuse, and the fuse is good. Is there a relay for each fan, or one for both? I haven't taken a good look yet so I don't know what I'm going to have to contend with. Do these fans go bad, or is it usually a switch/fuse/relay kinda thing?

Thanks

[carsonmx114]

unplug your thermoswitch (left side of radiator), one wire has constant 12v, one wire is low speed fan and the other is high speed fan. use a test light to find which wire is power, use a jumper wire to connect each of the other two wires to check the fan system. if both wires cause the fans to run then you know that your fuses, relays, and fans are good and you've got a bad thermoswitch. if you can't make the high speed fan run this way then start looking at relays and fuses.

[roadierfl]

Thanks for the tip - I'll get on to it during my lunch break and see what I can find out. I hope it's not a burned out fan.....lot of buck$ from what I've been led to believe

Thanks again,