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Author Topic:   Temp Problem
65_302
Gearhead

Posts: 240
From: Bixby, OK
Registered: Jul 2001

posted 07-19-2001 04:08 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
Its probably one you have heard before, but here goes.

We have overheating problem in traffic with the a/c. Its a new 302, new 180 deg stat, new hoses, Griffen 4 row no shroud. The Griffen is offset to the passenger's side about 3/4" to get it to fit. That means the fan is not exactly centered.

It goes about 3/4 of the way up on the temp gauge when in rush hour traffic with no a/c. Afraid to run it with a/c. When moving it runs below 1/2 way. I think my mixture is wrong because its almost 100% coolant.

The major questions are: 1) on a stock temp gauge what is the actual temps at certain points, 1/4, 1/2, 3/4? 2) At what temp is it be considered "bad" for the car to run?

Thanks for any suggestions/comments.

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MrXerox
Gearhead

Posts: 327
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 07-19-2001 04:45 PM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
I would buy a cheap mechanical gauge if I were you so you can at least see what your stock gauge references to. Also, get you some of that water wetter stuff, should be good for a 10-20 drop. Is your fan in a push or pull configuration? Try and wire it for a pull if it is not. That way you have the benefits of the moving car air as well as the pulling of the fan. There is no reason why that radiator should not keep that car cool unless something else is wrong...

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JAAZZY
Gearhead

Posts: 745
From: Bay Area, CA
Registered: Apr 2001

posted 07-19-2001 08:46 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote

A 4 row radiator is pretty thick. Air takes the path of least resistance. Your fan is probably pulling most of its air from around the radiator rather than through the fins, thus the coolant isn't losing much heat as it goes through the radiator.

You can try to experiment to see if it works better with a shroud by taking the car out for a drive and getting it good and hot and then coming home and making a temporary shoud out of cardboard. Let it idle in the driveway and see if it makes a difference. It should.

BTW, I also would suggest a gauge with an actual temp reading.

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Hamchuck
Journeyman

Posts: 19
From: Killeen, TX 76542
Registered: Mar 2001

posted 07-19-2001 09:29 PM     Click Here to See the Profile for Hamchuck     Edit/Delete Message   Reply w/Quote
Change out your anitfreeze/water ratio to something closer to 50/50, or even less antifreeze. According to an article in the current issue of Car Craft, water conducts heat 2.4 times better than ethylene glycol. Antifreeze raises the boiling point and lowers the freezing point, but at the cost of heat transfer efficiency. And I agree that some sort of shroud would definitely be a help also.

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65_302
Gearhead

Posts: 240
From: Bixby, OK
Registered: Jul 2001

posted 07-19-2001 09:45 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
Thanks for the suggestions.

Now. Anyone know where I can buy a shroud that will fit the Griffen?

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JAAZZY
Gearhead

Posts: 745
From: Bay Area, CA
Registered: Apr 2001

posted 07-19-2001 11:55 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
I'm not even sure there is one but call Griffen thy may have something. You can also have your local sheet metal shop or a metal fabricator make one if you give them a template. I'd probably have one made out of aluminum and then spot weld a couple of brackets to hold it to the radiator. I've always made templates out of cardboard and the local sheet metal shop has never given me any problems replicating them at a reasonable price. Once you start looking you'll probably find a lot of places tht are willing to do it. Good Luck.

quote:
Originally posted by 65_302:
Thanks for the suggestions.

Now. Anyone know where I can buy a shroud that will fit the Griffen?


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65_302
Gearhead

Posts: 240
From: Bixby, OK
Registered: Jul 2001

posted 07-18-2001 07:24 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
Thanks Jaazzy

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JAAZZY
Gearhead

Posts: 745
From: Bay Area, CA
Registered: Apr 2001

posted 07-18-2001 08:15 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote

I was just thinking...(yeah I know it's a mistake ) You could go down to the salvage yard and find one that's close and modify it a bit to work. Might be a lot easier.

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65_302
Gearhead

Posts: 240
From: Bixby, OK
Registered: Jul 2001

posted 07-18-2001 10:33 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
I had thought about doing that, but the fit on a shroud has to be pretty close. I would not even know what year to go for since the radiator is not stock. I guess I could just measure my rad, and go find one that is close and modify it. I may just try that. I could use some cabinet mounting brackets to attach to the shroud, but how do I mount the other end to the rad? Can't drill holes in the rad. Ok you engineers out there, what's the answer?

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