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Very Slow to Warm Up

 
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Shredder
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2001 Chevrolet Impala


PostPosted: Tue Dec 18, 2012 9:51 pm    Post subject:  Very Slow to Warm Up Reply with quote

3.8 with 315k. The engine used to warm up after just a couple miles driving, now it takes 15 minutes or so. I'm on the third thermostat so that is clearly not the problem. System is full and bled. Also, it tends to run a bit hot when idling in traffic but is spot on when in motion. Any ideas? Thanks.
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topgun
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2005 Chevrolet Impala


PostPosted: Wed Dec 19, 2012 8:53 pm    Post subject:  warm up Reply with quote

so after a longer period the heat is as it used to be, nice n hot? Maybe heater core is getting partially blocked. How do heater core hoses feel after normal warm up time? Cool

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Shredder
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PostPosted: Fri Dec 21, 2012 10:34 pm    Post subject:   Reply with quote

Not the heat, but the temperature gauge. Very slow to come up to operating temp. I'm out of ideas.
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Lingenfelter
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1999 Yugo Tempo


PostPosted: Fri Dec 21, 2012 10:40 pm    Post subject:   Reply with quote

Since the thermostat is taken care of, I'd have to guess there is some blockage (sludge?) in the lines or rad somewhere. Not sure what the fix is... a system flush maybe?

When sitting in traffic, less air is hitting the rad so the engine will run somewhat warmer in traffic than on the highway, but it shouldn't exceed halfway up the gauge in most situations.

Also, make sure you're using the right coolant and that it is diluted if it came in concentrate format. Some guys will top up with water but it's bad policy to do that continually since it lowers your boiling point and increases your freezing point.

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2001Ls
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PostPosted: Sat Dec 22, 2012 1:12 am    Post subject:   Reply with quote

If you're getting heat before that 15 mins but its just the gauge not going up it could be a bad coolant temp sensor? Im just not cear if its only the gauge or your not getting heat .

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topgun
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PostPosted: Sat Dec 22, 2012 3:41 pm    Post subject:  slow gauge Reply with quote

could be the stepper motor for temp gauge getting flaky. Cool

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98ss
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PostPosted: Tue Dec 25, 2012 5:50 pm    Post subject:  Re: slow gauge Reply with quote

topgun wrote:
could be the stepper motor for temp gauge getting flaky. Cool


If you have a scanner go to the live data mode and check to see what the coolant temp that would confirm a bad stepper motor.
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