Running hot and heater not working - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 14 (permalink) Old 09-06-2010, 05:40 PM Thread Starter
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Running hot and heater not working

I just bought a 95 z28 camaro with 170,000 miles. When I got it I had to replace the optispark and water pump. I have bled the lines multiple times. It is still running hot.... At idle it will get pretty close to the red then the fans will kick on And take it down to the middle mark. When driving it is usually half way between the middle mark and overheating but it can get hotter. Also when I was bleeding the lines with the heat on I noticed I was getting just Luke warm heat. I honestly don't know what to do now. Any help would be amazing! Oh and I also put in a new 180 degree thermostat.
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post #2 of 14 (permalink) Old 09-06-2010, 06:41 PM
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i think it could be the radiator cap on that one not keeping pressure could make it run hotter then usual.
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post #3 of 14 (permalink) Old 09-06-2010, 06:57 PM Thread Starter
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I thought that too so I checked it... Seems fine to me.
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post #4 of 14 (permalink) Old 09-06-2010, 07:00 PM
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hmmm does it go up and suddenly drop in tempeture? if so then the thermostat could be the problem just cause its new doesn't meen its not faulty
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post #5 of 14 (permalink) Old 09-06-2010, 07:28 PM Thread Starter
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No it rises and falls slow and steady. The thermostat I replaced only had 400 miles on it too
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post #6 of 14 (permalink) Old 09-06-2010, 07:37 PM
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i guess run the fans to switches since the temp drops when the fans turn on. that way u can turn the fans on at lower temps wen u want to.
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post #7 of 14 (permalink) Old 09-06-2010, 07:40 PM Thread Starter
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I thought about that but it stays realy hot when I'm driving at 60 mph.
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post #8 of 14 (permalink) Old 09-06-2010, 10:47 PM
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theres this additive that u can put into the radiotor fluid to keep the tempeture down a few more degrees don't remeber what its called but it should be at autozone. another thing try getting a 160* thermostat that'll help out a bit
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post #9 of 14 (permalink) Old 09-07-2010, 01:04 AM
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What about the heater core?

I've had a similar problem in the past with my '94 V6 Camaro and my '93 Ford Bronco. In the Bronco the heater wouldn't work very well at all and the engine would overheat all the time. I replaced the radiator, hoses, thermostat, switched to electric fans and basically bought a whole new cooling system. After all of that, I decided to replace the $40 heater core and BAM, the heater worked great and the truck never overheated again.

Try it!



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post #10 of 14 (permalink) Old 09-16-2010, 02:34 AM Thread Starter
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So.... I am nearly in tears from happiness. I went to autozone and a heater core was 70 bucks so instead I got some radiator cleaner... Didn't do anything... The return line to the heater core was cold so I disconnected the lines and put a garden hose to them.. After some work I got the lines cleaned and it runs amazing!!! It doesn't over heat at all!
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post #11 of 14 (permalink) Old 09-16-2010, 07:02 AM
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There are numerous threads about no heat and that flushing the heater core solved probably every one of them. It's a common thing on a 4th gen. So common that I have a flush procedure on my Tech Page. I would have suggested it, had I seen this thread before. At least you are happy, now.
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post #12 of 14 (permalink) Old 09-16-2010, 02:30 PM Thread Starter
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Two weeks on this forum and I never found another one... Two weeks of fighting with the car and never checked to see if the heat was actually working. Fml... Haha
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post #13 of 14 (permalink) Old 09-16-2010, 03:39 PM
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Quote:
Originally Posted by newbielt1 View Post
Two weeks on this forum and I never found another one... Two weeks of fighting with the car and never checked to see if the heat was actually working. Fml... Haha
That's why there is a search function. Most heater complaints come in the fall when the weather turns colder.
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post #14 of 14 (permalink) Old 09-17-2010, 05:39 AM
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Sounds like the heater core is stopped up. Then again running hot sounds like you didn't open the bleeders. Where the heater core has a air pocket in it.


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