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Failure Rad Fans

Austins01GP

Austins01GP

New member
Car 2005 Comp G

Well the car needed a new thermostat, so I picked up a 180 thermostat, and some green anti freeze to get the amazing dex-cool out of the car. Flushed the system, got the thermostat installed, fired it up and properly removed the air from the cooling system. Car sat perfect right at 180* (I have a scan gauge watching engine temp) took it out for a drive on the high way then in town. On the high way it's perfect. In town not so much. Temp creeps up. Got her home and opened the hood. Temp went from 185...190...195...200...205...210 (I shut down the engine at this point) but prior to killing the engine, I checked the fans, they never turned on as the car heated up. Knowing that the ac system uses those fans, I turned it on. The fans fired up on full speed and cooled the engine off to 183 with in a minute or so. So where are my fans otherwise? I don't know where to start with this.
Thanks for the help
 


you should of gotten a 195 degree thermostat. that is the right temp for the car. the fans kick on between 210-212 degrees. check and replace your relays and temp sensor. i had to replace my temp sensor to get my fans to kick on. it wasnt sending the right temp to the fans to kick on at 210-212. since i replace them it works fine. Make sure there is NO air in the hoses because that will make it run hot. Make sure there is NO anti freeze leak around the intake gaskets
 
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Austins01GP said:
Car 2005 Comp G

Well the car needed a new thermostat, so I picked up a 180 thermostat, and some green anti freeze to get the amazing dex-cool out of the car. Flushed the system, got the thermostat installed, fired it up and properly removed the air from the cooling system. Car sat perfect right at 180* (I have a scan gauge watching engine temp) took it out for a drive on the high way then in town. On the high way it's perfect. In town not so much. Temp creeps up. Got her home and opened the hood. Temp went from 185...190...195...200...205...210 (I shut down the engine at this point) but prior to killing the engine, I checked the fans, they never turned on as the car heated up. Knowing that the ac system uses those fans, I turned it on. The fans fired up on full speed and cooled the engine off to 183 with in a minute or so. So where are my fans otherwise? I don't know where to start with this.
Thanks for the help
Click to expand...


and it will run that way till the fans are tuned to come on sooner. my fans come on at 180, my car has a 195 in it it, ive not seen over 195 yet, it was at 180 for most of the winter. now that its a warmer out its 195.

without the fans tuned, it will creep up to 210 and more mark, its where it wants to run from the factory. fans dont come on till 212 stock.
 
lifedeerhunter said:
you should of gotten a 195 degree thermostat. that is the right temp for the car. the fans kick on between 210-212 degrees. check and replace your relays and temp sensor. i had to replace my temp sensor to get my fans to kick on. it wasnt sending the right temp to the fans to kick on at 210-212. since i replace them it works fine. Make sure there is NO air in the hoses because that will make it run hot. Make sure there is NO anti freeze leak around the intake gaskets
Click to expand...
No reason to replace temp sensor or relays. A\C uses the same relays and it works. He's also monitoring the temp via a scan gauge which uses the same value the PCM uses.
 


Thanks for the quick info guys, I guess I just assumed that they would come on ~ 10 degrees over what it should run at. 212 just seems high to me. LIM gaskets look good, I'm gonna be changing them to metal this summer as they are racking up miles on them (130000). I'm also probably gonna get an overkill pcm soon
 
lifedeerhunter said:
Fans wont kick on if the car has a bad temp sensor.
Click to expand...
Correct, but he doesn't have a bad temp sensor.

The PCM uses the temp sensor to monitor the engine's temperature and turn the fans on accordingly...He is using a scangauge to monitor the temperature so he is seeing what the PCM see's...It appears to be accurate since the fans aren't on and he's below the temperature where the fans should turn on, and the temperature is rising like a normal engine would.
 
Austins01GP said:
Thanks for the quick info guys, I guess I just assumed that they would come on ~ 10 degrees over what it should run at. 212 just seems high to me. LIM gaskets look good, I'm gonna be changing them to metal this summer as they are racking up miles on them (130000). I'm also probably gonna get an overkill pcm soon
Click to expand...

Thermostats are not an electrical piece. They are purely mechanical. The car has no idea what temp thermostat is in it, or would have no idea if it was removed so the fans are still going to come on at the temp that the ECU is set for.
 


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