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Old 04-03-2013, 05:39 PM   #1 (permalink)
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Cooling fans not coming on at the right time

Hello
I am new here wonding if someone knows about this problem. I have a 95 impala that is over heating. The cooling fans are coming on but not until it starts to over heat. I took the car into a shop and the guy at hte shop says the fans turn on at 229 degrees and shut off at 219 degrees. It looks like its over heating but its not. Thats what the guy at the shop told me and it didnt sound right to me can someone help

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Old 04-03-2013, 07:15 PM   #2 (permalink)
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This is the wrong section, but to answer the question the mechanic is right. GM tuned our cars very high for the fans to come on just short of the red mark. Why is beyond me, but its perfectly normal. You can retune for the fans to come on at a much lower temp. My tune has the fans to cut on at a little over 180-190 degrees. HTH...

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Old 04-04-2013, 07:05 AM   #3 (permalink)
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Thank you

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Old 04-04-2013, 11:01 AM   #4 (permalink)
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Thread moved.

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Old 04-04-2013, 12:25 PM   #5 (permalink)
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You might want to check your cooling system pressure, you might have an internal-engine leak and with the lower pressure it may not work quite right.

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Old 04-04-2013, 12:37 PM   #6 (permalink)
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The guy at the shop did that he said it was fine. I was thinking should I hook up a manual fan switch? Or put a thermastat that runs cooler like 160 degrees?

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Old 04-05-2013, 11:41 AM   #7 (permalink)
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Best bet is a tune to turn the fans on at a lower temp.

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Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
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16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 04-05-2013, 12:39 PM   #8 (permalink)
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Crime Scene

yeah i was talking to Crime Scene about that im going to give it a go and see what happens ill keep you all up to date and thanks again.

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Old 04-05-2013, 09:25 PM   #9 (permalink)
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I posted on the moved thread already, but on these cars, if it is coming on just as the needle hits the red, the fans are working right. You can tune it to come on earlier.

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Old 04-09-2013, 09:10 PM   #10 (permalink)
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So I got the new thermastat in today and it made a difference but I wish I could do some more to get the fans to kick on sooner.

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Old 04-10-2013, 10:49 AM   #11 (permalink)
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Tune is it man.

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Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 04-10-2013, 06:22 PM   #12 (permalink)
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Cool

If I am not mistaken, changing the stat to 160 is not going to make a difference unless you tune your PCM.

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Old 04-11-2013, 07:26 PM   #13 (permalink)
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No, it will make a difference, because you are opening the coolant flow earlier, thus helping it cool sooner.

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Old 04-12-2013, 11:28 AM   #14 (permalink)
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Only if you're moving, at idle it won't matter. It's like doing half the job.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 04-13-2013, 08:13 PM   #15 (permalink)
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The primary fan should come on just above the 1/2 way mark, then shutoff just under the 1/2 way mark. the secondary won't come on until just before the first red mark. If all is working correctly, you should never see the sec. fan come on. ....meaning , it should never get that hot. Just becauce the prim. fan is turning doesn't mean it moving enough air.

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