oz37k Posted April 23, 2012 Report Share Posted April 23, 2012 Hello All, I have been reading thru the threads and read about cleaning the grounds and air bubbles in cooling system that prevents fan to come on in time. I have replaced the radiator, t-stat, hoses including heater hoses, the coolant sensor under the manifold and repaired the wiring as it had stripped. I also used my Lisle spill free funnel to fill the cooling system following instructions. I also searched and cleaned the ground wires behind the headlights, Is there any other grounds I might need to clean? My problem is that that my primary fan turns on close to 235-245 temps and my secondary does not kick on. I do not know if my gauge is off but it seems to almost reach the red mark. It does not overheat and temps are cool while on the highway. Takes a while for it to reach the 235-245 temps but then the fan kicks in and brings it back down. I took my car to the A/C shop and they did not want to work on it cause they were afraid to overheat the car as they mentioned that the temp was climbing to high and fans were not kicking on in time. Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Schurkey Posted April 23, 2012 Report Share Posted April 23, 2012 My problem is that that my primary fan turns on close to 235-245 temps and my secondary does not kick on. HOW are you reading the temperature? Is your thermometer properly calibrated? Is it reliable? First Guess: It's not really getting as hot as you think it is. Second Guess: Defective temp sensor that turns on the fan. I took my car to the A/C shop and they did not want to work on it cause they were afraid to overheat the car as they mentioned that the temp was climbing to high and fans were not kicking on in time. They're boneheads. Don't ever go back there. Quote Link to comment Share on other sites More sharing options...
oz37k Posted April 23, 2012 Author Report Share Posted April 23, 2012 I was thinking sensor but I just replaced the sensor in December 2011. The only sensor I did not replace was the temp sensor for the guage (the one with green wire that goes to the head). I am confused, which one operates the fans, the one in the LIM (yellow and black wires) or the one in the head (1 green wire) also listed as temp switch on the autozone site. Quote Link to comment Share on other sites More sharing options...
Z34guy Posted April 24, 2012 Report Share Posted April 24, 2012 reminds me of a similar problem I had with my 95 Z34. Kept overheating. One of the fans wouldn't come on at all. Turned out that the motor shorted out and melted the wiring to the fan. replaced it with a junkyard fan and wiring to it and it was fine after that.. Check for shorts in the wiring. wiring shorts can cause all sorts of weird problems. Quote Link to comment Share on other sites More sharing options...
oz37k Posted April 24, 2012 Author Report Share Posted April 24, 2012 I don't know if this did the trick or not but I disconnected my battery to reset the computer in my Z34 during lunch at work and connected back when I was out from work and it seems that the fans are turning on 3/4 of the way on the temp gauge, way sooner than before. I let it idle once it cooled the first time and it turned them on when it reached the same 3/4 of the way on them temp gauge the 2nd time. I wonder if you have to reset the PCM after you refill the cooling system after servicing it or doing a repair involving messing with the cooling system. Quote Link to comment Share on other sites More sharing options...
carkhz316 Posted April 25, 2012 Report Share Posted April 25, 2012 How are you establishing the temp? Are you seeing it as reported by the PCM via a scantool, or are you just arbitrarily guessing as there are no numbers on these gauges (my 98 doesn't). Find out what the PCM is displaying for coolant temp, and go from there. When your gauge displays a "normal" reading, your PCM data should show roughly 195*, or whatever temp T-stat you have installed, with 195* being stock Quote Link to comment Share on other sites More sharing options...
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