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2002 Chevy Trailblazer Overheats, Coolant Evaps?
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shade963
New User
Aug 7, 2012, 7:09 PM
Post #1 of 3
(9120 views)
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2002 Chevy Trailblazer Overheats, Coolant Evaps?
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So the other day when I was driving home from work in the afternoon my car started to overheat and the gauge was all the way in the red. I pulled over and read in the manual to try leaving it in park and revving the engine to hold the RPMs at about half the idle RPMs. This worked and I drove the rest of the way home with no problems. When I got home and let it cool off I checked the overflow tank and saw that it was empty so I filled it up with water. The next day the same thing happened. When I got home I opened up the hood and saw that the water in the overflow tank was boiling. After I let it cool off, I came back out to look at it and saw that the overflow tank was empty. I checked the radiator line and saw that it was low (I couldn't see any water under the cap) but not empty (I didn't have to fill it up very much).
I used a pressure tester when the engine had cooled off and couldn't find a leak. I left the pressure tester on with water in the radiator for about an hr and came back outside and the water level hadn't gone down. I changed the thermostat and the problem still persists. I will hopefully be able to use a block tester soon to find out if it is leaking into the exhaust. I have checked the oil level and it hasn't changed.
Anyone have any ideas on what could be wrong? I would think if there was a leak I would lose water while driving and not after it has cooled off. It only overheats when driving home in the hot afternoon (been 100+ degrees outside at that time lately) and after being in traffic for about 40 mins. I can always turn the heater on full blast or rev the engine in neutral/park to get it to cool off when this happens. The water in the overflow tank is always boiling after it overheats. I always lose all the water in the overflow tank and some of whats in the radiator after turning off the car and letting the engine cool off.
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nickwarner
Veteran
/ Moderator
Aug 7, 2012, 9:14 PM
Post #3 of 3
(9067 views)
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Re: 2002 Chevy Trailblazer Overheats, Coolant Evaps?
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You ran it until the gauge was pegged and then RAN IT MORE! The reason the gauge has a red line is to tell you to shut the thing off. As HT beat me to it, I agree. I hope your credit rating is higher than your vision when you look at the dash because only if you are incredibly lucky will you not need a new motor. Do your cooing fans work? When it was running insanely hot and not shut off like it should were they blowing hard? Don't ever ever ever F**king ever do that again unless you don't like money.
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