Hey N2o Mike ??? Derale 16926 cool in stop and go but high on the highway???

N2o Mike hope all is well. Have the derale in the 65. Cools great during stop and go. Running a 160 thermostat, fan comes on at 150, Car runs 180-190 in stop and go. NOt to bad. On the highway it runs at 200-210? It seems like it would run cooler on the highway at higher speeds but it in fact runs higher? Any idea why? Turning about 2700 rpms on the highway at about 75mph. Imparting some wisdom would be greatly appreciated.
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BUT NOS cools even more!!!!!!!!!!!!![img]/phpBB/images/smiles/icon_bicker.gif[/img]

KID,JUST MESSING with you in all your post!! Ran347nosgt,YOUR GOOD FRIEND!!!![img]/phpBB/images/smiles/icon_smile.gif[/img] Let me know when that alternator arrives and be sure to get it to the shop to change that front seal!!![img]/phpBB/images/smiles/icon_tup.gif[/img]

<font size=-1>[ This Message was edited by: ran347nosgt on 4/13/04 7:58am ]</font>

I believe that the symptom you're describing comes from air going around the radiator instead of through it. In stop and go traffic, the fans are capable of pulling the needed air through the radiator, but, when you're at highway speeds, the air is forced around the radiator.

Check all the gaps between the body and the radiator.

Your problem should lie in there.

Have a good day!
Michael

Does it do this with the fan on? If so, airflow should not be the problem.

An engine builds more heat when it is producing more power. It produces more heat running down the road at 70mph than in traffic. The extra airflow from the speed usually takes care of this, but not always.

My car use to overheat on the highway when it had the stock 2-core radiator. Replacing it with a larger one (with no other changes) brought the temps right into line.

The stock 2-core radiators were borderline with the factory engines. If your car still has the stock rad, replace it with a larger one.

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The other thing on my mind is... Are you sure the fan is blowing the right way? If you hook up the wires backwards, the fan will push air out the front.... and it will cool just fine when sitting, but when moving, the fan will FIGHT the natural airflow, and the car will overheat. (Don't ask me how I know this) It's a long, entertaining story involving beer, nitrous, a harmonic balancer that slung it's inertia ring and broke the water pump, and a buddy who volunteered to change it while I was at work. [img]/phpBB/images/smiles/icon_smile.gif[/img]

Good Luck!

_________________
Mike Burch, 66 mustang real street
302 4-speed 289 heads, 10.63 @ 129.3
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
http://www.fortunecity.com/silverstone/healey/367

<font size=-1>[ This Message was edited by: n2omike on 4/13/04 9:09am ]</font>

Mike, currently I have a three core radiator not the original 2 core. Will probably switch to an aluminum. Wondering how much difference. I assume that the fan is running on the highway since it is relayed to come on at 150 and automatically when the air is on.
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N2o MIke the fan blows air toward the engine not toward the radiator. The fan is mounted between the radiator and the engine.
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