Cooling fan does'nt kick on - Maintenance and Repair Forum
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I have a 1995 cav. recently replaced the pcm using my orginal eprom since its obd1, crank sensor, and gm did a recall repair to the starter involving a couple wires to the starter and a relay ,prior to all this my cooling fan worked fine now it wont turn on when it should, checked the relay its good, cooling temp sensor is good and fuse and gounds are all good, jumped a wire from relay the fan turned on also when pulling the plug at the cooling temp sensor the fan kicked on but the car idled down and died , at this point cant figure out where to check next ? would appreciate any help at a roadblock at this point Thanks
I even did a quick visual inspection of the wiring harness the runs underneath the front bumper, everything there looked fine
It could have two temp. sensors. One just for the gauges, and a separate one for the PCM and fan.
Another idea is that mine doesn't kick on either, but according to the dashboard it may not really need to.
If the auto parts store could read the OBD temperature when you take it by there that might be a way of knowing for sure if the fan was
supposed to be on?
Or what does your dashboard gauge say when you expect the fan to kick on?
Usually you can hear the fan kick on when it goes a little over the half mark on the gauge, the book shows there is only one coolant temp sensor by the thermostat, would there be a possibility the fan motor could be bad even if you could jump it from the relay?
If you're jumping the relay then the relay is bad, but the condition requesting the relay to flip on would have to be there first of all.
I don't notice my fan either, and the gauge goes slightly to the right of the middle sometimes. So either I have a similar problem, or
it's just not really supposed to kick on that soon.
maybe a picture of the temp. gauge would help
I didnt jump the relay itself I pulled the relay and used a wire at the box I connected 30 and 87 to see if the fan would turn on and it did to make sure it was functioning, Iam curious with a new pcm could there be anything going on there not turning the fan on since it seems everything else checked out so far
It could, I guess. I don't know, but here is a pic of mine, just idling on a cool night, sometimes it runs a little further to the right, and still no fan.
I had this same problem although given yours does sound worse then mine. I had to replace the motor on the fan as it would burn fuses every time it was turned on for over 30 seconds. never had a problem since.
I am looking for struts for my newly aquired Eibach pro-kit performance coils, If anybody has some?
Sounds like the relay to me. Grab a volt meter and see if the trigger wire for the relay has power when it should, whatever temp that maybe.
- Your not-so-local, untrained, uncertified, backyard mechanic. But my @!#$ runs
I really don't expect my fan, until it's much closer to the dotted line, and my daily driving doesn't make it that hot.
That's what I don't know, I don't know where on the gauge the fan should kick on.
I pulled the relay out of my 98 cav. and put it in the 95 no luck on that part still didnt kick on but cant figure out why car would sputter and die when you unplug the coolant temp. sensor? but the fan did kick on once i unplugged it!
Update cooling fan now works but seems like the gauge hits 3/4 of the way before it kicked on didnt cool it to the half way mark,and only turned on once while idling in driveway, went and replaced the fan motor and ignition control module since and when the car stays at 3/4 on temp gauge car stalls and dies wont restart until it cools down, this one got me already stuck all types of parts in it cant figure this one out Thanks
just but a new electric fan and hook it up to a switch and turn it on whenever you feel as if it needs to be on. there problem solved and its better than wasting a bunch of money trying to figure out the problem.
if you uplug the CTS by the thermostat the fan should kick on within a few seconds
if not then bad relay or fan motor
faulty CTS will cause no or delayed fan kick on
the PCM uses info from the CTS to decide when to kick the triger wire on to the fan control relay
its pretty simple really
-96 cavalier 2.2 auto 143k miles
I am wondering if it could be a wiring issue because the pcm is new and the cts has been replaced for the second time swapped out the relay with the blower relay because I now that one worked, really doubt the new parts would br a issue, bad part Im not very good with wiring issues Thanks
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its got the same issue.