Need some diagnostic help with overheating - Team Camaro Tech
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post #1 of 10 (permalink) Old Aug 27th, 18, 07:38 AM Thread Starter
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Need some diagnostic help with overheating

My 2002 Chevy S10 2.2 liter started overheating a few days ago. It gets up to around 230*. It used to run about 200. I have filled the reservoir but it hasn't gone down. Today I drained the radiator and it was almost empty. Why wouldn't it pull in from the reservoir?

I plan to flush it and replace the thermostat although I just took that out and tested it in a pan of boiling water and at 195* it opened. Not sure if it opened all the way. I don't know how they look when they are fully opened.

Another weird thing that might be related about the same time it started overheating my AC is always very cold. The temperature adjust doesn't change how cold it is. Related??
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post #2 of 10 (permalink) Old Aug 27th, 18, 07:53 AM
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Re: Need some diagnostic help with overheating

Check you radiator cap and you radiator hoses that may be collapsing.

If thatís all good and youíre still loosing coolant without seeing any leaks then itís possibly a head gasket.

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post #3 of 10 (permalink) Old Aug 27th, 18, 07:53 AM
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Re: Need some diagnostic help with overheating

As the fluid in the radiator heats up it builds pressure in the core and when it cools down the pressure drops sucking the fluid from the recovery tank. No fluid in the core, no or little pressure build up so it can't pull from the recovery tank.

Pressure test your core to see where the fluid went. If it doesn't seem to be leaking get a new pressure cap, fill the system and start fresh and watch things closely...

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post #4 of 10 (permalink) Old Aug 27th, 18, 07:58 AM
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Re: Need some diagnostic help with overheating

Quote:
Why wouldn't it pull in from the reservoir?
Because the pressure cap is defective.

Coolant is only good for two years. If you haven't changed the coolant it ceases working in terms of protection against freezing or over heating; and it attacks aluminum exposed to the coolant because it has become acidic. Might add most of your motor is made of aluminum so it is at risk of sever corrosion if not protected.

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post #5 of 10 (permalink) Old Aug 27th, 18, 11:04 AM Thread Starter
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Re: Need some diagnostic help with overheating

I'm in the process of flushing using Prestone Flush. I see a small puddle from a drip under right corner (pic 1). It is white foamy so I assume it's the flush cleaner. Come to think of it there has always been a very small drip at that spot on my garage floor. It's been that way for years. I've just kept it topped off. Guess I need to investigate what that is. The second pic is trying to spot where it might be coming from. What is that part it's running around? It's at the lower back of the radiator and looks to be electrical.
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post #6 of 10 (permalink) Old Aug 30th, 18, 11:56 AM Thread Starter
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Re: Need some diagnostic help with overheating

I picked up a radiator and cap tester at O'Reilly's. Anybody know how to use this thing? The instructions aren't very clear.
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post #7 of 10 (permalink) Old Aug 30th, 18, 12:00 PM
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Re: Need some diagnostic help with overheating

You put it on in place of your radiator cap and pump it up. Read on gauges and watch for leak down.


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post #8 of 10 (permalink) Old Aug 30th, 18, 12:43 PM Thread Starter
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Re: Need some diagnostic help with overheating

Well that was pretty simple after all. The cap from my S10 is a 15 psi. A couple pumps and the gauge goes to 15 then back to zero immediately. I took the cap off my 68 Camaro (16 psi) and one pump it goes to 16 and stays there. Time for a new cap.

Thanks for the tutorial link.
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post #9 of 10 (permalink) Old Aug 30th, 18, 02:28 PM
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Re: Need some diagnostic help with overheating

Good job, in fact, 'Atta Boy' award goes out.
Hopefully, a new cap will fix the malady at hand.

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post #10 of 10 (permalink) Old Aug 30th, 18, 04:51 PM
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Re: Need some diagnostic help with overheating

Quote:
Originally Posted by Vega$69 View Post
You put it on in place of your radiator cap and pump it up. Read on gauges and watch for leak down.

How to test radiator caps and radiators - YouTube
Nice video but the guy needs 3 hands or a cameraman LOL

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