Engine overheats

XJSHEN

MEMBER
2003 PONTIAC MONTANA
71,000 MILES

Pressure inside of radiator abnormally higher than usual and coolant flow out from radiator mouth continuously when open the radiator cap. What is cause of the problem? How to remove those air inside cooling system? I tried normal air bleeding from left and right side, but it does not help to remove the air and reduce the inside pressure. I think that may be caused by intake manifold gasket problem.
Thanks for your instruction and comment.

8 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Can be a number of reasons. It can be a coolant leak into the cylinder and this can be checked with a head check, which is a simple chemical test to see if exhaust gasses are in the cooling system. Most work shops can do this simple test quickly. Other reasons can be a faulty thermostat a blocked radiator or a faulty water pump. If you get the radiator checked, have it removed and core cleaned, as a back flush will not do the job here. It may have a number of blocked core tubes restricting coolant circulation.

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Saturday, June 24th, 2017 AT 6:23 PM

XJSHEN

MEMBER
218 POSTS

Thanks a lot for your help!
Actually, I worked with conventional air removing method that was not effective to remove the air in the radiator and reduce the pressure in the radiator.
How to remove the air in the radiator? Is normal air removing method effective?
Thanks for your comment and instruction!

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Tuesday, June 27th, 2017 AT 1:10 PM

MHPAUTOS

MECHANIC
31,937 POSTS

Run with cap off air should make its way to the top, if you can have the front of the car slightly elevated as this can help

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Tuesday, June 27th, 2017 AT 7:19 PM

XJSHEN

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218 POSTS

Thanks! I did it but does not work!

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Monday, July 3rd, 2017 AT 4:46 PM

KEN L

MASTER CERTIFIED MECHANIC
48,505 POSTS

Hello and welcome to the site

It sounds like you have a blown head gasket, here is a test to help confirm the problem.

https://www.2carpros.com/articles/head-gasket-blown-test

Please run this test and get back to us we are interested to see what it is.

Cheers, Ken