Getting Hot?

[ZMAN_DIEHL!!!]

I have a cooling problem in the 95 Z
the water level is fine i changed the waterpump, thermo, and jumpered the fans they all work
the radiator is fairly clean. For some strange reason my cooling fans do not come on except when I turn on the AC.
Is there something I missed . The low coolant sensor is bad also I have a low coolant light when the car reaches temperature
I would not think that would have anything to do with it .
I thik the enhine cooling fan is not coming on at all and the AC fan is the one doing all the work. HELP?

[N20LT4Bird]

There are two fans there and only one is working with the AC on right? Could be many different things ranging from a bad fan relay, bad wiring or the ECT sensor giving eroneous readings to the PCM.

Check to see if you are getting power to the relay after the car reaches 225 degrees. Or swap in a different relay in order to check it. If the relay has power on both sides then check the wiring to the fan.

Or splice in a new relay and a switch for the dash and be done with it because the PCM lets the car get too hot anyways!

[Injuneer]

There is only one pair of fans, and they serve both the A/C and engine cooling. If the fans come on with the A/C, they are healthy.

What coolant temperature are you seeing on the dash gauge? Stock PCM settings turn the 1st fan on (or low speed in the later models) at 226degF, and the 2nd fan on (or high speed in the later models) at 235degF. Is your coolant getting that warm?

You may need to check the coolant temp sensor. The one in the drivers side head only feeds the dash gauge. There is another sensor on the water pump housing that feeds the temp to the PCM. If that sensor is faulty, it should set a trouble code. Make sure the wire is connected. You can check the sensor with an ohm meter.

[ZMAN_DIEHL!!!]

if i sit there running the temp will climb up above half and keep going so if i turn on the AC the fans come on and it starts cooling properly
so you think the sensor in the waterpump is possibly the culprit?

[ZMAN_DIEHL!!!]

i have already played the mix and match game with the relays for the fans

[SteveH37Formula]

Bleed the cooling system by opening the two bleeder screws on top near the water pump. Also check the condition of the radiator and the A/C consenser is clear. Also the baffle around the radiator. There should be no leaks of air going around the radiator.