I wrote about a month or two ago about how my 93 Camaro Z28 was having cooling fan problems. Just as a recap,

- the fan motors do work, I jumped them and they turn on just fine.

- They work when I flash my PCM

- They work when my AC is operating.

For now, I have some speaker wire and toggle hooked up to my Coolant Temp. Sensor and I use that to turn them on and off. I'm taking some automotive classes at my local college and since the end of the year is here, our instructor has been letting us use the equipment on our cars. I took my car for a spin with a scanner hooked up and I found out that my fans will turn on by themselves at 109 degrees Celsius. But on my guage for the coolant temp, it shows it at about 1/3 the way into the red. Yes, the red. Is that the correct time for them to turn on? On the guage it would be a little over 220 degrees. Also, before my radiator exploded (Which is when all these problems started), the temp guage would stay around half. Even in traffic during 100+ degree weather. Is it possible that my therm has screwed up? Now the heat in the engine rises all the way to red and I don't think the therm opens much. Any comments are much appreciated. Thanks in advance!

 

if you switch your heat control to either off the defrost settings when the temp is above 180 , with the fan on 4, the fans should come on.

I wish these cars had the old school fan that was not electric like my 88 caprice. IT never got hot in traffic .

Anyone know of a way to ditch the electric fans and go to a belt controled fan?

 

Yea, the fans do turn on when you do that. But it sucks if you live in Texas and gotta do it to get your fans to come on!

 

Stock fans come on at 226º. Your scan tool indicated normal operation. If your gauge does not read correctly, maybe you need to replace the sensor in the cylinder head.

 

The Coolant Temp. Sensor? I already did replace it. Twice....or is it another one?

 

There is a sep. switch for the gauge in the side of the head.. The computer uses' the one in the water pump.. go w/ Delco stay away from autozone type brands

 

Are they the same kind of switch? I have two coolant temp. sensors in my garage.

 

If you did not replace the one in the head, you did not replace the one for the gauge. Two different part numbers for the two sensors:

1993-1997 coolant temperature sensor for gauge ACDelco #213-77
GM p/n25037332

1993-1997 coolant temperature sensor for pcm ACDelco# 213-310
GM p/n15326386
(old # 12146312)