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Dan
Dan, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 1311
Experience:  Dealer Auto Technician
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What will cause your check engine light to be a on and your

Customer Question

What will cause your check engine light to be a on and your car to overheat I change my water pump my thermostat did the test No head problem change spark plug valve cover gasket 99 Cadillac Deville Northstar
Submitted: 10 days ago.
Category: Cadillac
Expert:  Dan replied 10 days ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 10 days ago.

What are the codes causing the engine light to stay on have you had this scanned?

Customer: replied 10 days ago.
Is said the purred sensor but it just wasn't hooked up I hooked it up the check engine light is still on
Expert:  Dan replied 10 days ago.

Make sure the cooling fans are coming on and working. Also this engine is common for head gasket problem.

Customer: replied 10 days ago.
Had the head gaskets tested they are 180 what about the heating core that's the only thing I haven't had changed
Expert:  Dan replied 10 days ago.

Does it blow hot air from the vents with the heat on?

Customer: replied 10 days ago.
but the car started back running hot again and the cooling was bubbling but it didn't come out
Expert:  Dan replied 10 days ago.

A blown head gasket would cause bubbling in the cooling system as well as an overheat problem. You need a cooling system pressure tester, and make sure the system holds pressure. Also can run engine with gauge installed to see if pressure rises from combustion gases entering cooling system.

Customer: replied 10 days ago.
Already had the test my head are good change the gasket out they're all at 180
Expert:  Dan replied 10 days ago.

Try flushing the cooling system you might have a clogged radiator or heater core.

Customer: replied 10 days ago.
Brand-new radiator new coolant but I have them put a new heater core on
Expert:  Dan replied 10 days ago.

Also make sure the cooling fans are working.

Customer: replied 10 days ago.
Both of them are working there turn it on when the car crank up
Expert:  Dan replied 10 days ago.

Make sure the is no air in the cooling system by performing the bleed procedure.

Customer: replied 10 days ago.
that will cause your car to overheat
Expert:  Dan replied 10 days ago.

Yes

Customer: replied 10 days ago.
I won't be able to see about getting that done until tomorrow
Expert:  Dan replied 9 days ago.

Ok

Expert:  Dan replied 9 days ago.

Let me know

Expert:  Dan replied 4 days ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.

Thanks