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Old 08-20-2011, 09:53 PM
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Cooling Problem

I have a 67 GTO, with matching numbers 400 4bbl. I can cruise all day on the x way or regular roads and stay at 190 to 195 degrees. When I get into traffic (stop and go), the temp rises to close to 240!! I have a shroud, and, the aux. fan doesn't help much. I have the original 4 core radiator which I just had re-cored....Any other suggestions?

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Old 08-20-2011, 10:21 PM
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In general, high speed cooling problems are due to insufficient radiator capacity, while low speed problems are due to insufficient air flow. Are you using a stock metal bladed fan with a thermostatic clutch? It should be a 6 or 7 blade fan that is about 17-19" in diameter, and it should extend about halfway into the shroud. You should use a heavy duty or severe duty fan clutch.

I had an old HD fan clutch on my truck and it worked fine as long as weather was moderate, but it did not really kick in the fan until about 220. I bought a new fan clutch of the same type and I can hear it start to kick in at about 200, which keeps the temps at a max of about 200-205 in traffic.

Bruce
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Old 08-20-2011, 10:45 PM
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I am going to try a spacer on the fan first (to move it in closer to the rad.......The clutch was my next thought....thanks for the reply!
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Old 08-21-2011, 01:04 PM
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Quote:
Originally Posted by jsgoatman67
I am going to try a spacer on the fan first (to move it in closer to the rad.......The clutch was my next thought....thanks for the reply!
Moving the fan up inside the shroud is not going to help. Best efficiency is with the fan blade tips 1/2 in and 1/2 out of the shroud (as you view the fan and shroud from the side), and with about 3/4" clearance between the outer tip of the fan blade and the shroud (as viewed from directly behind the fan, as if looking towards the radiator ).

If I was gonna take a WAG at this w/o seeing it, given what you've said I'd say the fan clutch was shot or the initial timing was too low.
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Old 08-21-2011, 03:18 PM
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The fan is only about 1/3 the way in, but, I am thinking it is the fan clutch too. Thanks for your response!
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Old 08-21-2011, 03:28 PM
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Quote:
Originally Posted by jsgoatman67
The fan is only about 1/3 the way in, but, I am thinking it is the fan clutch too. Thanks for your response!
1/3 is OK, but if the clutch isn't working as it should, well- you know!

You might be able to buy the new clutch assembly w/a shaft length that'll place the fan exactly where you want it, otherwise get one w/the same shaft as the one you now have, it'll work fine at 1/3-2/3.
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