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Old 06-14-2013, 06:05 PM   #1
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95 z28 overheating again.

I know I've posted about this several times and I apologize, so here we go. I have a 95 z28 and the damn thing keeps overheating. Everything that's been replaced: both cooling fans, radiators been flushed, 3 all new fan relays, new waterpump, both temp sensors, new Rad cap have been replaced. I pulled the temp sensor on the front of the engine and both fans kicked on at high speed. It overheats at idle I would appreciate any advice. The A/c has no freon, I think I read somewhere shobox that the fans wouldn't come on without freon in the system? Someone correct me if I'm wrong thanks.
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Old 06-14-2013, 06:17 PM   #2
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I deleted my AC and my fans work. Are you following the proper filling procedure. You have to make sure there is no air in the system.


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Old 06-14-2013, 08:32 PM   #3
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Re: 95 z28 overheating again.

What I said was the fans won't come on with the a/c, if the a/c is not charged and compressor operation is inhibited by lack of pressure. This does not affect fan operation otherwise.

OP, give more details on "overheating".
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Old 06-15-2013, 10:55 AM   #4
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Re: 95 z28 overheating again.

It'll just overheat at idle like stop lights or just sitting around. Both of the fans came on after I pulled the front Temp sensor. It gets up to the 260 line on the gage. Would a fan switch and 160* theremostat help?
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Old 06-15-2013, 11:21 AM   #5
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Re: 95 z28 overheating again.

That would be putting a band-aid on a screwed up system. Might fix it, might not. Fix the system.

There has to be a reason the fans are not operating when they are programmed to come on. Use a scanner to determine the coolant temp the PCM is indicating from the sensor in the water pump. Could be a wiring problem.
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Old 06-15-2013, 11:23 AM   #6
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Re: 95 z28 overheating again.

Previous threads for reference:

Overheating Problem

95 z28 Overheating
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Old 06-16-2013, 11:18 AM   #7
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Re: 95 z28 overheating again.

How would I go about going to check the sensor
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Old 06-17-2013, 08:37 AM   #8
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Re: 95 z28 overheating again.

Quote:
Originally Posted by Jake Guzman View Post
How would I go about going to check the sensor
4th Gen LT1 F-body Tech Articles
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Old 06-17-2013, 11:38 AM   #9
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Re: 95 z28 overheating again.

Run a switch from fan to the inside of car fans on camaros really chevys have that problem the rely tells fan to cut on to late this will keep engine cool
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Old 07-08-2013, 12:33 PM   #10
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Re: 95 z28 overheating again.

If your fans end up working correctly......Check for headgaskets leaking, hook up a coolant system pressure tester and see what happens, check for coolant getting into cylinders. Thats what i did to mine when it was overheating after checking out everything else. Headgaskets ended up being bad..they were leaking, car would hit 260 and puke out coolant from overflow bottle.
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