Rad Fans Not Coming on Engine over-heats
Rad Fans Not Coming on Engine over-heats But when I turn on the AC the fans kick-in and is all ok. At this point I have to keep the AC on to keep the engine cool I read the in other forums that the PCM may be bad or the coolant temp sensor. If I remove the temp sensor plug and short the 2-wires and if the fans start running is this a good test. I do not want to buy a PCM before I check the cheaper fixes 1st.
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It really helps if we know what you are driving. I would replace the coolant temp sensor before getting a new pcm. I don't think shorting the sensor will work. It's not like an on/off switch for the fan. It tells the PCM what the coolant temp is, and the PCM turns the fans on.
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You could DISCONNECT the coolant temp sensor as a TEST. The fans should automatically turn on. This is a safety feature built into the PCM should it detect an open condition with the temp sensor.
Roy is correct though, we need to know what kind of car you have. |
Originally Posted by 2kg4u
(Post 1567710)
It really helps if we know what you are driving. I would replace the coolant temp sensor before getting a new pcm. I don't think shorting the sensor will work. It's not like an on/off switch for the fan. It tells the PCM what the coolant temp is, and the PCM turns the fans on.
At this point I have to assume all is ok with the fans and other electrical connections. Can I also assume it may be the sensor or the pcm. If I was a betting man I would say it's the pcm based on the fact I did replace the temp sensor on the olds and that did not solve the problem. |
It would appear that the system is working fine. Now, my question is, how hot is the temp gauge showing?
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Originally Posted by Mike1995
(Post 1567723)
It would appear that the system is working fine. Now, my question is, how hot is the temp gauge showing?
At this point I will run the van with the temp sensor unplugged and I also unplugged on of the fans to keep the drain on the battery and the wear on the fan ( at least on one of the fans) As I stated had the same problem the way I solved that problem was GM had a $1,000 incentive if you traded a junker car even-though it was in great shape less the over-heating) |
Now im thinking your thermostat is sticking closed.
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Interesting thing I did unplug the temp sensor wire as stated and now the temp gauge is not working. I gues the temp gauge uses the same temp sensor. I guess this is what happens when you tinker with stuff. At least I know the engine is not overheating. I also have a temp gauge I can install just to keep my eye on the system.
I would have changed the stat But what was GM thinking. How does one get to it. I am feeling for those poor car techs. |
I really hope your not running around with that sensor disconnected. I offered that as a test only. Just change the thermostat.
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Originally Posted by Mike1995
(Post 1567731)
I really hope your not running around with that sensor disconnected. I offered that as a test only. Just change the thermostat.
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