Two new radiator caps leak. Why?
Thread Starter
Senior Member
Joined: Mar 2003
Posts: 523
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From: Marion, Iowa
Car: 92 Camaro
Engine: ZZ4 Crate Engine w/Hot Cam
Transmission: Rebuilt 700R4 with Transgo and MW 3
Axle/Gears: 3.73 Eaton Posi
Two new radiator caps leak. Why?
My radiator cap seal is not sealing against the radiator properly. When I squeeze the lower radiator hose I can see air and coolant going into the overflow bottle. I've tried TWO brand new 16lb caps from two differnt auto parts stores. Neither one seals at all.
What is going on here? Is it not supposed to seal when the engine is cold?
What is going on here? Is it not supposed to seal when the engine is cold?
Joined: May 2004
Posts: 2,262
Likes: 1
From: houston
Car: 83 POS monte carlo 2015 chevy P/U
Engine: 92 5.7 tpi 5.3
Transmission: 700r4 6L60E
Axle/Gears: 2.42 too high
it should seal at all times, hot or cold.
down inside of the neck where the radiator cap goes there is a place where the bottom seal of the cap seats, look very closely at it, there should be a small ridge that runs around it. if there are any places on the ridge part that are not smooth & even, thats your problem.
down inside of the neck where the radiator cap goes there is a place where the bottom seal of the cap seats, look very closely at it, there should be a small ridge that runs around it. if there are any places on the ridge part that are not smooth & even, thats your problem.
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