Truck Overheating
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Joined: Mar 2011
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From: Cincinnati
Truck Overheating
Ok so I have completed the rebuild of the 302 in my 85 f150. I needed to run the engine for 20 minutes to break in the new cam. after about 8 minutes I noticed the temperature rising quickly. So I turned the truck off and the temperature continued to rise. I need help figuring out why it is over heating. The fan was spinning fine the belt was not slipping. The thermostat was brand new and I tested it in hot water before installing it. The water pump is brand new The radiator was flushed out. I will probably go to a 2 row radiator, but I'm not so sure that the radiator is my problem at this point. A
Any ideas what this could be and how to test for them?
Any ideas what this could be and how to test for them?
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Joined: Nov 2007
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From: Denver Metro Area, CO
First thing to come to mind is a wrong water pump - one intended for a Serpentine belt which spins in the opposite direction.
I think what I would do is let it cool off some, remove the radiator cap, start it up and see if you can see fluid circulating through the radiator.
Another possibility is a wrong fan - also one intended for a Serpentine system where the blades are angled to accommodate the "backwards" rotation.
I think what I would do is let it cool off some, remove the radiator cap, start it up and see if you can see fluid circulating through the radiator.
Another possibility is a wrong fan - also one intended for a Serpentine system where the blades are angled to accommodate the "backwards" rotation.
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From: Virginia
I am almost 100% sure you have air trapped in the engine block. Pull a sensor off the top of the engine that goes into the water jacket, and make sure coolant comes out. Then run it, and let it burp the remaining air out of it.
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From: Cincinnati
I just took the thermostat out and it does not have weep holes of any sort. I'm going to put a new thermostat in it and do what you said to get the air out. Then tonight I'll see how the temp is and hopefully get this cam broke in.
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