97 Camaro Z28 Cooling Issue.
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Newbie
Joined: Sep 2010
Posts: 9
97 Camaro Z28 Cooling Issue.
Hello,
I am trying to help my brother with an overheating issue on his Camaro and am getting no where. I figured it wouldn't hurt to get peoples opinions and input.
The car simply overheats and starts to boil over because the elctrical fans never trigger.
This is what i have done to remedy the problem as well as some observations...
1. Replaced Cool Temp Switch.
2. Tested (3) Fan Relays which all are functional.
3. Traced CTS wire to ECU and checked connectivity. OK.
4. Both Fans operate with AC on.
5. With no CTS connected, fans come on ? normal ?
Any suggestions would be appreciated.
Pete
I am trying to help my brother with an overheating issue on his Camaro and am getting no where. I figured it wouldn't hurt to get peoples opinions and input.
The car simply overheats and starts to boil over because the elctrical fans never trigger.
This is what i have done to remedy the problem as well as some observations...
1. Replaced Cool Temp Switch.
2. Tested (3) Fan Relays which all are functional.
3. Traced CTS wire to ECU and checked connectivity. OK.
4. Both Fans operate with AC on.
5. With no CTS connected, fans come on ? normal ?
Any suggestions would be appreciated.
Pete
April 2011 ROTM
Joined: Mar 2009
Posts: 22,023
From: Tokeland, Washington
ROTM Winner's Club
test temp sensor
http://www.shbox.com/1/4th_gen_tech2.html#ect
check here to
http://www.shbox.com/1/4th_gen_tech2.html#cooling
http://www.shbox.com/1/4th_gen_tech2.html#ect
check here to
http://www.shbox.com/1/4th_gen_tech2.html#cooling
Thread Starter
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Newbie
Joined: Sep 2010
Posts: 9
I appreciate the reading material crabby, i will take a look at it later today and let you folks know soon.
Does someone know if unplugging the sensor completely should trigger the fans on as it has in my situation ?
Thanks
Pete
Does someone know if unplugging the sensor completely should trigger the fans on as it has in my situation ?
Thanks
Pete
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
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Newbie
Joined: Sep 2010
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Using a multimeter i back probed the CTS to watch its impedance as the car is running to see what the computer is actually seeing using the above linked chart.
What i found out is that the temperature/resistances make sense when the car is off. As soon as i insert the key or start the car the multimeter reads OpenLoop or Megaohms on another meter, which doesn't make any sense or does it ?
I also followed the proper bleeding procedures to make sure that air is out of the system appropriately.
Ideas ? ?
Pete
What i found out is that the temperature/resistances make sense when the car is off. As soon as i insert the key or start the car the multimeter reads OpenLoop or Megaohms on another meter, which doesn't make any sense or does it ?
I also followed the proper bleeding procedures to make sure that air is out of the system appropriately.
Ideas ? ?
Pete
April 2011 ROTM
Joined: Mar 2009
Posts: 22,023
From: Tokeland, Washington
ROTM Winner's Club
yes. i had my memcal in wrong and it didnt show a ses light. did show a ecu code. the obd2 will store confirmed codes (3 or more occurrences) and passive codes (one or two occurrences)