Cchris1109

iTrader: (11)

not my car, but the same year as my car

Owner had only 2.5 qts of oil in it so i filled her up

also had to put in one gallon of radiator fluid in the resevoir

the car continues to overheat but i also notice the fan does not kick on at all, when i start the car *considering it had been over heating the fan would kick on since its past 225* I can hear the fan try to start but it just stops and doesnt turn on.

Is replacing a radiator fan on these cars hard or anything special i should need to know or any other ideas on what could be causing it to over heat, i dont believe its a blown head gasket or leaking radiator, no liquid is seen and no oil is being burned/seen spitting out

Revelation Z28

iTrader: (10)

thermostat, waterpump, and fan clutch or wiring may be bad.

Cchris1109

iTrader: (11)

forgot about those 2 will check em tomorrow

UnitZ28

did you bleed the cooling system?

anaik

Put the heater control on the A/C setting. If the fans don't come on then it's the relay, fuse, fans, or wiring.


@nthony, what's a fan clutch?

bmccrary

I had the same problem. GM has the fans set to come on at such high temps, and when the fans finally do come, they can't do much about it.

Does the car have good temps, when it is rolling down the highway..

If so, just have some one flash the fans for you. I had a guy set my first fan to come on at like 190 and the second, around 200. I still need to get a 160 degree thermostat, but my car doesn't get hot now. I can sit in traffic for an hour in Charlotte and the needle won't move.

Revelation Z28

iTrader: (10)

fan clutch is practically what starts/disengages the motor on the fans.

Charging TA

If you said you can hear them trying to turn then I doubt its the fan relay, but you can try swapping the fog light relay for the fan relay... (If I remember correctly).

Cchris1109

iTrader: (11)

checked the guys car again, fans do not kick on at any time

fan kicks on when the ac is on....so i guess something is wrong with the fan relay/switches?

anaik

If the fans work in A/C setting, relays and wiring should be OK. Could be the temp sensor that the PCM reads, the one in the waterpump. If it's not reading the correct temp, PCM won't command the fans on.

In case you don't know here's where it is; compliments of shoebox.

http://shbox.com/1/temp_sensor1.jpg

67SS&99SS

iTrader: (7)

I had this problem with my uncle's 94 Z/28. Fans would only come on when the A/C was on. First I replaced all 3 relays....nothing. Next, I replaced both coolant temp sensors, one on the drivers side head behind the #1 exhaust port, then the one close to the water pump....nothing. The opti took a dump next and when the mechanic pulled the water pump off, he said 1/2 the bearings were gone. So, with a new opti, new water pump and a stock temp thermostat, the car stays at 180*. I would replace the water pump and thermostat.

dhdenney

iTrader: (53)

These cars do not have fan clutches. Electric fans do not have fan clutches. That's why they're electric. Fan clutches are used on accessory mounted fans so as not spin the thing all the time.