Radiator Overflow Spilling Over!!
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Radiator Overflow Spilling Over!!
hey everyon....im just about to post some pics of the successful 5.0 build i did in my 87 f150 when i can get this one bug fixed!
long story short, pulled motor, new cam, heads, high flow water pump, 160 degree t-stat, roller rockers, oil pump, double roller timing chain,...ect.
well the first few times i ran the truck the temp gauge stayed nice and low (barely in the normal range cause of the 160 degree t-stat i guess).
the last few times ive been driving it around, the coolant will fill the overflow resevoir, and spill out the top. then i shut it off and the overflow stays full, but the radiator is low (cant even see coolant in it).....ive filled the radiator back up and burped the system but it keeps doint this, and last night it heated up pretty high, so i shut the truck down while i was cruising, and then as soon as i shut it off, the temp gauge dropped, and i fired it back up and drove for 20 min. with no prob! when i got home,,,,,,,,overflow full, and radiator low??
any help would be appreciated
forgot to mention i put a new oem replacement radiator in it too.
long story short, pulled motor, new cam, heads, high flow water pump, 160 degree t-stat, roller rockers, oil pump, double roller timing chain,...ect.
well the first few times i ran the truck the temp gauge stayed nice and low (barely in the normal range cause of the 160 degree t-stat i guess).
the last few times ive been driving it around, the coolant will fill the overflow resevoir, and spill out the top. then i shut it off and the overflow stays full, but the radiator is low (cant even see coolant in it).....ive filled the radiator back up and burped the system but it keeps doint this, and last night it heated up pretty high, so i shut the truck down while i was cruising, and then as soon as i shut it off, the temp gauge dropped, and i fired it back up and drove for 20 min. with no prob! when i got home,,,,,,,,overflow full, and radiator low??
any help would be appreciated
forgot to mention i put a new oem replacement radiator in it too.
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Joined: Jan 2003
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From: Munroe falls, Ohio
If the engine didnt overheat before you upgraded it, then its one of your upgrades except the new radiator.
Why a high flow water pump?
How old is the rad cap?
Also why do you have a 160* thermostat? If you engine is computer controlled, it will never get out of open loop (rich fuel mixture), even its its a carb setup 160* will not heat up the engine enough to burn off the water and fuel buildup in the oil.
Why a high flow water pump?
How old is the rad cap?
Also why do you have a 160* thermostat? If you engine is computer controlled, it will never get out of open loop (rich fuel mixture), even its its a carb setup 160* will not heat up the engine enough to burn off the water and fuel buildup in the oil.
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i thought the cooler the better? no it didnt overheat before, the cap is a few years old, but even with the 160 degree tstat, shouldnt it open sooner and give less chance for the coolant to boil into the overflow? maybe it is my cap! doesnt the cap prevent the coolant from going to the overflow until a certain pressure is given? thanks
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From: Munroe falls, Ohio
The cap has two functions. It has a pressure valve to allow coolant to exit the rad @ whatever psi the cap is rated for, this is for the expanding coolant due to heat. Then it has a vacuum valve to allow the rad to suck in the coolant from the overflow tank after the coolant has cooled down.
No, overcooling is bad. The computer is looking at water temp to determine if its should go into closed loop, in closed loop the ecm starts reading the oxygen sensor and varying the fuel mixture. With your 160* thermostat, the ecm is staying in open loop longer, thus burning more fuel.
Having too much cooling also effects the oil in that the fuel and condensation that builds up in the oil will not be burned off during engine operation.
No, overcooling is bad. The computer is looking at water temp to determine if its should go into closed loop, in closed loop the ecm starts reading the oxygen sensor and varying the fuel mixture. With your 160* thermostat, the ecm is staying in open loop longer, thus burning more fuel.
Having too much cooling also effects the oil in that the fuel and condensation that builds up in the oil will not be burned off during engine operation.
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I second handsomerob. But if not, I have seen aftermarket waterpumps with the blades going the wrong way for the application. Also without insulting you, are you sure the tstat isn't in backwards. The symptoms sound similar to a stuck tstat.
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