Question about 1994 Ford F150 Styleside Supercab

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Runs hot when rad cap is tight

Prob is in cooling system with rad full when i tighten cap an drive for 10 miles gage will go to hot i stop an release presure temp will go back to normal i can drive another 5 miles i have repeat presure release it goes back to norm i can repeat this several times before adding water if i leave cap lose i can go 50 miles or more i have change caps i have removed thermostat do u think i might havea head gasket prob engine runs an idles good the engine 5.0 auto trans; thanks mhj

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With the cap off when you start the car does the water shoot out? if so the head gasket is blown and when the cap is tight the water is pressurized by the leaking head gasket and will cause to overheat from pressure blowing all the water out of the overflow. or the head gasket leak is boiling the water in the head and causing the water to overheat.
this is my guess or you have a coolant leak somewhere over the exhaust and it isnt making it to the ground from evaporation.
check for swollen hoses. if you have swollen hoses ill bet they are covered in oil this will break down the rubber and weaken the hoses keep all oil leaks from getting on your hoses at all times as this will destroy them.if you need to replace the cap then the pressure release in the cap is worn out or stuck and the pressure isn't reaching the over flow. replace cap and see if problem is resolved.overheating isn't usually caused by a cap.
but cars differ in design and the thermostat may need the pressure to release properly.
if that doesnt work try replacing the thermostat it is responsible for releasing hot water from the engine to the radiator to be cooled by the fan then close off so the water can cool in the radiator. if this cycle doesnt work properly then the thremostat is usually the culprit.
replace as nessesary.
good luck

Posted on Jun 02, 2009


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