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Nov 10, 2003 | 06:06 PM

3Vettes@Home

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Melting Slicks

Joined: Sep 2000

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From: Milton, West Virginia

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Need Help.....Please

I have a friend who owns a 94 Corvette engine code "P". His water pump went out (car was not driven after finding out, and still had coolant). Water pump was replaced, now car is overheating. He's had two different "Techs" bleed system, car still overheats. Tech also replaced a relay to the fans. With relay unpluged car does not overheat, with relay plugged in and fans working car overheats!..any Ideas will be greatly appreciated. Also what is the proper bleeding technique of the coolant system, Thanks!

[Modified by 3Vettes@Home, 7:00 PM 11/10/2003]

Nov 10, 2003 | 08:16 PM

iceman_t1

Pro

Joined: Sep 2003

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From: Houston TX

Re: Need Help.....Please (3Vettes@Home)

Did you check the radiator cap to make sure it has the correct spring? If the cap spring is too tight, it might not let the system work properly. I got a 15lb cap from GM and it fixed my slight problem. Also check the radiator hoses a couple hours after the car has been run. If the hoses are compressed, that could also be a sign that the cap is not the right one. Hope that helps.

Nov 10, 2003 | 08:22 PM

3Vettes@Home

Thread Starter

Melting Slicks

Joined: Sep 2000

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From: Milton, West Virginia

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Re: Need Help.....Please (iceman_t1)

Thanks! I'll have him check the cap :cheers:

Nov 10, 2003 | 10:29 PM

autotech

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Joined: Oct 2003

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From: Midland Texas

Re: Need Help.....Please (iceman_t1)

The relay thing makes no sense to me. How could that be unless its just effecting the temp. readout? Anyway, I am not familiar with the year model but some have an air bleeder, usually near the thermostat, to get the air out. I doubt you have that. Some later models, any make, after about 1990 had problems when refilling coolant systems will get an air bubble in the system making it difficult th fully refill the coolant system. I found a tool thru Snap-On that pulls a vacuum on the coolant system when empty. It does 2 things, lets you know if you have any leaks and then draws the fluid into the system eliminating any posibility of air bubbles. I've been using it for years and it works great...Good Luck... :thumbs:

Nov 10, 2003 | 10:35 PM

autotech

Racer

Joined: Oct 2003

Posts: 273

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From: Midland Texas

Re: Need Help.....Please (3Vettes@Home)

One last thing - Since the tool is a little expensive, you might take the vehicle a radiator shop as they should have the tool and could do it for you. :thumbs:

Nov 11, 2003 | 05:57 PM

CFI-EFI

Race Director

Joined: Sep 2000

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From: The Top of Utah

Re: Need Help.....Please (3Vettes@Home)

Quote:

Tech also replaced a relay to the fans. With relay unpluged car does not overheat, with relay plugged in and fans working car overheats!..any

To me, there is only one possible explaination. Either the new relay is the wrong part, or it got wired incorrectly. The d.c. fan motor is wired with reverse polarity and turning backwards. That's the weirdest deal I've heard of in a long time, but it's the only explaination, given the facts. Good luck, and...

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