Possible thermostat problems
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Possible thermostat problems
I am in the process of narrowing down my 92 F250 4x4 7.3IDI overheating problems. I drained the cooling system to put fresh coolent with additive and new thermostat. My truck was at normal operating temperature when i shut it down. I waited 20-30 min. then opened the lower vaulve to drain the radiator. When the coolent started coming out I noticed it was very cool. I then open the upper radiator cap and the coolent was hot! What does this mean? Is this normal or do I have thermostat sticking problems or maybe waterpump problems. Thanks!
Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
My dad had the same problem on his 92. The problem problem turned out to be the thermostat in the end after changing the fan clutch and a few other things.
The frustrating part was the problem was intermittent, the truck would overheat some days and not others.
The root problem with the thermostat is that the 92' used a copper ring that was rubber covered and shrink fit onto the outside of the thermostat casing. This ring split on my dads truck and every once in a while would slide off the thermostat case and then block the cooling water flow even with the thermostat itself being open.
Once the truck cooled down the ring would slide back into its factory position and the next time you run the truck there would not be a problem.
This problem went away on the 93 with a new thermostat design that had the rubber directly attached to the thermostat casing.
The reason for the rubber ring I believe is to get a better seal on thermostat to prevent leakage so the diesel engine would warm up faster after cold starting.
Hope the above helps.
The frustrating part was the problem was intermittent, the truck would overheat some days and not others.
The root problem with the thermostat is that the 92' used a copper ring that was rubber covered and shrink fit onto the outside of the thermostat casing. This ring split on my dads truck and every once in a while would slide off the thermostat case and then block the cooling water flow even with the thermostat itself being open.
Once the truck cooled down the ring would slide back into its factory position and the next time you run the truck there would not be a problem.
This problem went away on the 93 with a new thermostat design that had the rubber directly attached to the thermostat casing.
The reason for the rubber ring I believe is to get a better seal on thermostat to prevent leakage so the diesel engine would warm up faster after cold starting.
Hope the above helps.
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Hamberger,
Sounds very similar to my problem. In the begining phases of overheating it was intermitent now, it is very consitent. I will not be able to get too the thermostat for the next couple of days to check it. I had to order a thermostat from the ford dealership ($25.00). I am also pulling the radiator and having cleaned out by a local shop. Hopefully this is my problem. I will let you know!
Thanks, Eddie
Sounds very similar to my problem. In the begining phases of overheating it was intermitent now, it is very consitent. I will not be able to get too the thermostat for the next couple of days to check it. I had to order a thermostat from the ford dealership ($25.00). I am also pulling the radiator and having cleaned out by a local shop. Hopefully this is my problem. I will let you know!
Thanks, Eddie
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1996 f-250 7.3L
1994.5 - 1997 7.3L Power Stroke Diesel
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Feb 19, 2010 12:11 AM
