Posted: Tue Dec 18, 2012 9:51 pm Post subject: Very Slow to Warm Up
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.
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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