Overheating
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Joined: Feb 2005
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Overheating
1992 F-250 4x4, 5sp manual, a/c, rebuilt 7.3 diesel w/banks turbo: Driving home from work I noticed my heater did not work (temp gauge riding). Temp was indicating higher than normal by the time I arrived home where I then observed coolant overflowing from my "overflow" tank. Top of radiator was cold, bottom was hot. Figured it must be the thermostat. Just replaced the thermostat (figured out the old one opens at 200 degrees rather than 195 it's rated at, but it opens) and when I started it up, it pumped cold coolant out into the overflow tank immediately. Radiator cap is a 7psi cap and the engine/radiator and all associated rigging has about 25,000 mile on it. Ideas??
I've done a few searches and don't find anything that gives me a hint as to where to go from here. I assume the water pump is okay because it pumps the coolant out to the overflow tank................I'm just feeling special today, boy oh boy, I get to keep workin on my truck!
I've done a few searches and don't find anything that gives me a hint as to where to go from here. I assume the water pump is okay because it pumps the coolant out to the overflow tank................I'm just feeling special today, boy oh boy, I get to keep workin on my truck!
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
Likes: 14
From: West Cornwall, CT
If your radiator cap is good and holds pressure, there is no way the water pump could put out enough pressure to lift the cap and pump coolant to the overflow tank.
This sounds like it might be an exhaust gas leak into the cooling system. I hope not!
Try posting this problem in the diesel forum so that the real experts can help you out.
Lou Braun
This sounds like it might be an exhaust gas leak into the cooling system. I hope not!
Try posting this problem in the diesel forum so that the real experts can help you out.
Lou Braun
