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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Having a issue with my 1986 chevy 350 water is cold but

Customer Question

Having a issue with my 1986 chevy 350 water is cold but still over heating took intake off and put new lifter and push rods and I'm thinking I might have put gaskets in backwards or water pump because it build a lot of pressure in main collant lines
Submitted: 7 months ago.
Category: Chevy
Expert:  Roy replied 7 months ago.

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

Expert:  Roy replied 7 months ago.

ok, first, did you replace the head gaskets???

did you at least do a leak down test on the cylinders to confirm the gaskets are good??

the excessive pressure could be coming from a leaking head gasket leaking compression into the cooling system

Roy

Customer: replied 7 months ago.
First open radiator and let it run and didn't bubble or nothing then still had problem and got a block tear with the blue liquid nothing so I take it heads are fine
Customer: replied 7 months ago.
My worry is water pump but what a bad water pump cause that much pressure
Customer: replied 7 months ago.
a slight grind noise coming from pump
Expert:  Roy replied 7 months ago.

ok, I understand but you still may have a gasket issue. as I stated, the only way to confirm is a leak down test to confirm.

I will opt out of this and see if someone else can help you.

Roy

Expert:  GM Bob replied 7 months ago.

Hello my name is Bob.

Do you still need help?

All this happened after the lifters were replaced?

Customer: replied 7 months ago.
Would a bad water pump cause pressure in the lower and upper radiators hoes and cause engine to over heat
Expert:  GM Bob replied 7 months ago.

Yes If its not working properly.

Pressure builds up from overheating. If it builds up cold startup may have a bad head gasket?

Customer: replied 7 months ago.
Ok
Customer: replied 7 months ago.
I have done a block test and no exhaust gaskets
Customer: replied 7 months ago.
In coolant system
Expert:  GM Bob replied 7 months ago.

When does it overheat or build pressure?

Customer: replied 7 months ago.
After let it run for awhile
Expert:  GM Bob replied 7 months ago.

When you put the intake gasket on are the tabs to the front? The blocked out coolant passages to the rear.

Customer: replied 7 months ago.
I'm pretty sure I block back passages
Expert:  GM Bob replied 7 months ago.

Make sure you can see the tabs sticking out on the front of the intake.

Customer: replied 7 months ago.
They are
Expert:  GM Bob replied 7 months ago.

Did this start after your repairs?

Customer: replied 7 months ago.
Before
Expert:  GM Bob replied 7 months ago.

You don't think you have a air pocket?

If the pump is noisy may have a internal problem.

Was the pump replaced?

Customer: replied 7 months ago.
No
Expert:  GM Bob replied 7 months ago.

Did you replace the T-stat?

Customer: replied 7 months ago.
Expert:  GM Bob replied 7 months ago.

Can you tell me everything you replaced so far?

For the overheating problem

Customer: replied 7 months ago.
T state temp sensor
Customer: replied 7 months ago.
Pumps going to be next
Expert:  GM Bob replied 7 months ago.

When it overheats are you driving or idling?

If the radiator or fan is not cooling properly the pressure will build up.

You antifreeze in it not just water?