03 Overheat?
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Freshman User
Joined: Feb 2004
Posts: 30
Likes: 0
From: California
03 Overheat?
When pulling a hill, I get a check engine light, High temp, and once and awhile the motor goes to half power. The dealership cant identify the problem. They have had the truck 2 weeks. They installed the BLACK BOX and said they got different codes, but cant find a problem. They also dont have a dino. The truck, I think, Needs to be put under load. Wat do you think. Have 30k on truck and has been in three times for the same problem. Who can I contact? 
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Well, diagnosis isn't really that difficult....I'd go looking for another dealer who knows what there doing.
If there is a cooling system problem under load, it would lead me to believe the EGR cooler is failing. During these incidences, is coolant spewed severly out of the degas bottle cap? The reduced power is from defueling/derate due to high ECT.
There really isn't that many potential things that can cause this issue. The head gaskets could be faulty, the EGR cooler could have failed...other than that, only a bad water pump or a stuck thermostat will cause severe overheating, and if it were one of those two the truck would exhibit symptoms even with no load.
If it was my truck, number 1 priority would be to ensure the EGR cooler wasn't busted/melted. Second would be headgaskets- let the dealer know that a compression leakdown test isn't worth a damn if this is the case, because they will only fail under high load and reseal once the engine is cooled, since they are multi-layer steel gaskets. Make sure they check for exhaust gasses in the water jacket and cooling system-if they are present, it is most certainly either the cooler or the gaskets. Generally it is acceptable by Ford to replace both at the same time if exhaust is present in the coolant.
Is the cooling fan engaging when this happens? You'll know it if it does, the fan is extremely loud. If not, the vistronic fan clutch and wiring may be an issue to be looked at as well.
If there is a cooling system problem under load, it would lead me to believe the EGR cooler is failing. During these incidences, is coolant spewed severly out of the degas bottle cap? The reduced power is from defueling/derate due to high ECT.
There really isn't that many potential things that can cause this issue. The head gaskets could be faulty, the EGR cooler could have failed...other than that, only a bad water pump or a stuck thermostat will cause severe overheating, and if it were one of those two the truck would exhibit symptoms even with no load.
If it was my truck, number 1 priority would be to ensure the EGR cooler wasn't busted/melted. Second would be headgaskets- let the dealer know that a compression leakdown test isn't worth a damn if this is the case, because they will only fail under high load and reseal once the engine is cooled, since they are multi-layer steel gaskets. Make sure they check for exhaust gasses in the water jacket and cooling system-if they are present, it is most certainly either the cooler or the gaskets. Generally it is acceptable by Ford to replace both at the same time if exhaust is present in the coolant.
Is the cooling fan engaging when this happens? You'll know it if it does, the fan is extremely loud. If not, the vistronic fan clutch and wiring may be an issue to be looked at as well.
Elder User
Joined: Dec 2000
Posts: 654
Likes: 0
From: Michigan
Ford just replaced my engine 2 weeks ago because of overheating. That warpped the heads and scored one of the cylinder walls. I was overheating and loosing coolant through thr fill cap. There is a TSB on this that has been discused in another thread in the 6.0 forum. Have them check it out.
Jim
Jim
