Heat issues
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Heat issues
My '01 Super Duty 5.4 has an overheating/heater problem that the dealer can't seem to fix.
I noticed my heater was blowing cold then a few miles later it overheated pushing coolant out of cap. Next day drove fine to Ford dealer who replaced my heater core, thermostat, reservoir cap and a hose. Drove it for a day till the exact original symptoms occurred again with a gurgling sound in dash. Dealer kept for a week pressurizing system but no leaks found. Replaced my thermostat again and gave it back. I drove it 300 miles over a week before the exact same symptoms occurred. Brought back to dealer who said that air was in the system, added a bunch of coolant and supposedly got all the air out. Same symptoms still. Brought back to dealer that finally changed the water pump they said had a leak. Guess what, same symptoms. Heater will work fine for days then it will blow cold, then hot, then cold and sooner or later truck will overheat then just as fast cool down and heater will work again. Still hearing gurgling. Dealer said I don't have a HCV. Please help!!!
I noticed my heater was blowing cold then a few miles later it overheated pushing coolant out of cap. Next day drove fine to Ford dealer who replaced my heater core, thermostat, reservoir cap and a hose. Drove it for a day till the exact original symptoms occurred again with a gurgling sound in dash. Dealer kept for a week pressurizing system but no leaks found. Replaced my thermostat again and gave it back. I drove it 300 miles over a week before the exact same symptoms occurred. Brought back to dealer who said that air was in the system, added a bunch of coolant and supposedly got all the air out. Same symptoms still. Brought back to dealer that finally changed the water pump they said had a leak. Guess what, same symptoms. Heater will work fine for days then it will blow cold, then hot, then cold and sooner or later truck will overheat then just as fast cool down and heater will work again. Still hearing gurgling. Dealer said I don't have a HCV. Please help!!!
Mountain Pass
Joined: Dec 2010
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It sure sounds like a head gasket. Getting the air out is not easy if the engine is pumping more in.
I guess you already know this, but you get an air bubble in the engine, and then it changes places and gets in the heater. That is where the air bubble is when the heater is blowing cold air.
If the head gasket situation is not sucking water in, then you wouldn't expect to have any water consumption. You would instead expect it to overflow at some point. however, there is no predicting how much stuff is going back and forth through the leak.
I guess you already know this, but you get an air bubble in the engine, and then it changes places and gets in the heater. That is where the air bubble is when the heater is blowing cold air.
If the head gasket situation is not sucking water in, then you wouldn't expect to have any water consumption. You would instead expect it to overflow at some point. however, there is no predicting how much stuff is going back and forth through the leak.
Senior User
Joined: Oct 2007
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My guess would be the radiator. Run the engine until it gets warm, feel the radiator with your bare hand, if there is any ambient temperature tube between hot tubes, then your radiator is partially blocked, it must be replaced. Let us know what you find out.
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