pushing coolant issue
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pushing coolant issue
Hello all. im at my wits end here!!! i have a 90 bronco with a mild build 302. im pushing coolant out my over flow bottle. the veh hasnt over heated yet, i catch it before it gets in the red. no coolant in the oil and im not burning it. but i pulled the heads, had them cleaned magnifluzed, pressure checked and remilled. the guy said he couldnt find a problem. i assembled the engine with new felpro gaskets ( installed the right way) and arp bolts. still pushes coolant. i replaced thermostat, water pump, hoses. took out old radiator and installed a new used radiator. it stopped for a day, now its back to pushing coolant again!!! please help!! tomarrow im going to get a coolant check to see if it is a head gasket. ive checked the fan clutch, it feels fine but??? please help!!
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yes ive replaced the radiator cap. also it will sit and idle without any issues. ive tried reving it up while it sits and it wont push the coolant out. only when i drive it and its put under a load.
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i had this IDENTICAL THING HAPPEN TO ME when i did a mild build on my 87! new water pump, cap, radiator, and would push into the overflow! after trying a bunch of stuff i think what my problem was, was that i put a high flow water pump on the truck when i did the build, but a regular flow t-stat.
i didnt know they made high flow t-stats till i was browsing in summit one day! i installed it, it pushed one time after, and hasnt done it since! this was in spring, and ive made it through the extreme heat, and now the cold with no problems......ill never run a high flow water pump again! my truck stays cool, the needle barely gets into the normal range, even in 95 degree weather! it sucks cause my heats not as hot in the winter,
anyway hope this helps,,,,good luck
i didnt know they made high flow t-stats till i was browsing in summit one day! i installed it, it pushed one time after, and hasnt done it since! this was in spring, and ive made it through the extreme heat, and now the cold with no problems......ill never run a high flow water pump again! my truck stays cool, the needle barely gets into the normal range, even in 95 degree weather! it sucks cause my heats not as hot in the winter,
anyway hope this helps,,,,good luck
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mine did the same thing....could let idle for an hour with not problems! but as soon as you put it under a load (driving) it would push coolant out and start to overheat! i drove around hoodless for a while after the build, and could see it bubbling out of the overflow!
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il have to go back and look at what water pump i got from napa, i know i baught a new one made by true flow. i put a 180deg thermostat in when i did my head gaskets but later went back to the 195 thremo with no real change. on a side note. there is a slight difference in water pump backing plates between the truck and the mustang. the truck backing plate has a more rectangle inlet outlet while the mustang backing plate has a round inlet outlet. but the timing chane cover that the water pump bolts to is the same between the truck and the mustang. iam using the truck water pump. hope i didnt loose anyone! thanks for the ideas guys
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i remember running a 160 degree regular tstat at first (like a fool), but when i got the hight flow, i went back to a 195. and it still runs cool! i learned the hard way.... good luck
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Cargo Master
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From: NE Texas
I would do a cylinder leak down test, or maybe just use a connection to pressurize each cylinder through the spark plug hole and don't bother with the gauge.
Apply pressure and LISTEN! You will mainly be listening or watching through the radiator filler neck. Pressurize each cylinder and listen/watch for bubbles at the radiator. Once you find a cylinder or two, the leak is on that bank. Pull the head on that bank so you can see if it is a head gasket or a crack.
Apply pressure and LISTEN! You will mainly be listening or watching through the radiator filler neck. Pressurize each cylinder and listen/watch for bubbles at the radiator. Once you find a cylinder or two, the leak is on that bank. Pull the head on that bank so you can see if it is a head gasket or a crack.
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ok so i dont have exhaust gasses in my coolant. i had that tested today. thats good cause i dont want to pull those off again. talking with the mechanic he thinks im not getting the air out of the system properly and the air is super heating and pushing out the coolant. so tonight im going to reburp the cooling system. man ill feel like a tard if turns out it was just air in the system causing my issues!!! thanks again guys ill keep you updated.
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i think i have it figured out!! Bob i think you hit it on the head with the high flow t-stat. its bene in the single digits here weather wise, so i put a piece of cardboard in front of my radiator. sence then i havent pushed any coolant out. i think keeping the temp up ( which is between the N and the O in normal ) keeps the t-stat open and the coolant circulating. the stock t-stat must not be able to keep up with the flow??? so this weekend im going to change t-stats.
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