Need Help! Overflow Overflowing!!
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Senior User
Joined: Dec 2004
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Need Help! Overflow Overflowing!!
hello, i recently went through my 5.0 in my 87 f150 longbed aod....i did cam, heads, roller rockers, oil pump, high flow water pump, 160 degree t-stat, new radiator, new goodyear hoses.
everything great except my cooling system.
at idle the truck heats up into the lower normal range, and i can let it idle all day long and it stays nice and cool.........but as soon as i start driving it, the overflow fills up, spills over, and the truck starts heating up. i though i had a bad radiator cap, so i got a new 13lb cap yesterday, and it seemed to help at first but then started doing the same thing.
my theory is that the high flow water pump (which i know i probably shouldnt have installed now) is creating a lot more pressure and is blowing past the cap into the overflow......does anyone know if ford makes a cap with a higher psi rating that will fit, or should i go another route instead of a different cap??
any help would be appreciated
everything great except my cooling system.
at idle the truck heats up into the lower normal range, and i can let it idle all day long and it stays nice and cool.........but as soon as i start driving it, the overflow fills up, spills over, and the truck starts heating up. i though i had a bad radiator cap, so i got a new 13lb cap yesterday, and it seemed to help at first but then started doing the same thing.
my theory is that the high flow water pump (which i know i probably shouldnt have installed now) is creating a lot more pressure and is blowing past the cap into the overflow......does anyone know if ford makes a cap with a higher psi rating that will fit, or should i go another route instead of a different cap??
any help would be appreciated
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Joined: Aug 2005
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Doesn't 5.0 engines with serpentine belt system turn the water pump different direction than older v belt pulley ones? Are you sure you have the correct water pump for your application. Maybe call the water pump co. and verify yours. I also think you need a 180 d thermostat. I think napa has 15-16 lb cap for your vehicle. Don't get the cheapies.
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yeah i know i got the right water pump cause the engine gasket set for the 5.0 has 2 different water pump gaskets. one is for the carb water pump, and the other is for the reverse rotation efi water pump.
i will call napa tomorrow and mess with it......i am also curious cause a friend told me he thinks it might be my t-stat not opening enough. and when i browse through summit, i see regular t-stats, and high flow t-stats. i wonder if i need a high flow t-stat to match my water pump??
thanks for the help
i will call napa tomorrow and mess with it......i am also curious cause a friend told me he thinks it might be my t-stat not opening enough. and when i browse through summit, i see regular t-stats, and high flow t-stats. i wonder if i need a high flow t-stat to match my water pump??
thanks for the help
