I have a 95 f250 with a 460. I had coolant come out of the overflow bottle after sitting for a couple minutes. Has only happened one time but dont want to chance harming the engine. New water pump and thermostat 700 miles ago. Truck doesnt overheat. Drained oil to check for coolant, no coolant in oil. No oil in the radiator. Took radiator cap off and let run for about 25 minutes to get air out. Then replaced thermostat just to be safe along with letting it run with no cap on for about 25 minutes. I have pressure tested the coolant system and it held strong. Needle didnt drop at all. No leaks anywhere, and doesnt use coolant. Any Ideas ?? I am thinking maybe a head gasket but it doesnt leak, doesnt have white smoke, doesnt blow coolant out with the radiator cap off while idling. The only thing I am unsure of is, if the fan clutch works. Help before I tear in to replace the head gaskets.
I tried to get a combustion tester, didnt have one. Will try tomorrow. I think I am going to get a new fan clutch cause I am sure it is the original. By the way truck has 120,000 so I am sure it is in need of a new one anyway.
I have had two last over 150k and several that failed between 100k and 150k. Most of the Fords I replaced because the fan bearing was noisy, loose and/or not engaging. The GMs tended to lock up. Mopars were good but I haven't had a high mileage RWD Mopar.
I like electric fans but they fail too. The wife's Caprice has an electric fan and a fan clutch. I have installed electric fans as aux units to increase the performance of A/c units and transmission coolers in stop and go driving but would install two if I was eleminating the mechanical fan.
Tested the coolant with a block tester (combustion fluid test). It passed and stayed blue in color.
Replaced the radiator cap to rule that out and am going to tomorrow for a new fan clutch.
After I replace those I will update but at this point I am going to rule out the head gasket and hope that I am right.
Thanks for all the help and will post after I get the clutch fan replaced.