Running hot
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Joined: Jul 2002
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From: waco
Running hot
I have a 73 swb F100 that I put a 460 and c6 in. Driving 50 MPH or less it stays at 190 degrees. Anything over 50 mph and temperature goes from 200 to 205. I have replaced the thermostat, the hoses, and upgraded to a heavy duty clutch for the fan. I went out and ordered the radiator that came as part of the towing package, supposed to be the biggest available. I bought a shroud for it. I have the proper 50/50 mix of antifreeze and water. The water pump does not leak, and it appears that the bearings are good. I hope someone has a bright idea, cause I'm fresh out.
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Joined: Dec 2001
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From: Louisville,Ky.
Possibly running too lean or the timing could be off. 205 isn't bad to run at. Your clutch on the fan usually releases at highway speeds and most of the cooling is done by the air being blown thru the grill.
A worn waterpump could also cause cavitation at higher speeds. The impeller may be worn and it isn't moving as much water. Radiator hoses are sucking shut at higher rpms are they?
A worn waterpump could also cause cavitation at higher speeds. The impeller may be worn and it isn't moving as much water. Radiator hoses are sucking shut at higher rpms are they?
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Joined: Sep 2001
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Speed requires power and the more power produced in the engine the higher your engine temp will go because of the limited heat exchanger capacity of the cooling system. Your engine's cooling system temp will depend on flow capacity, surface area. airspeed, ambient temp, water flow rate and temp, and heat to be dissipated. It is a balancing act. 
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From: waco
I did install the big radiator. It made no change to the temperature. I went and got hoses with the springs inside so that they cant suck shut at high RPM's. My carberator is actualy running a little rich at this point, and timing is correct. Only thing I know to do is put a water pump on it.
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From: waco
OK. I see. I didn't realize they run that warm naturaly. I had a 390 in the truck before the 460, and it very rarely got over about 185 to 190. When I looked down and was running 200 on up, I got excited. Will I be able to add A/C to my truck with out over heating?
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Junior User
Joined: Jul 2004
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From: houston, tx
adding a/c should not be a prob. if you do you should also add an oil cooler. this will give your engine a little more cooling power
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I had the same problem with the water pump belt squealing and glazing under load. Annual or less on fan belts on infrequently driven motorhome. New radiator helped but did not cure. Abandonded thermostatic stock fan for stainless after market. I have not had fan belt problems, squealing or overheating since. 100 plus degrees on a grade in Baja last month and only got to half of gauge. Runs normal at slightly less than half.
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Originally Posted by velella
I had the same problem with the water pump belt squealing and glazing under load. Annual or less on fan belts on infrequently driven motorhome. New radiator helped but did not cure. Abandonded thermostatic stock fan for stainless after market. I have not had fan belt problems, squealing or overheating since. 100 plus degrees on a grade in Baja last month and only got to half of gauge. Runs normal at slightly less than half.
