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Question

What psi should the radiator cap vent at. I had to replace the cap and it vents at 13 psi. I can not keep liquid in the it and it is not leaking.

Submitted: 206 days and 22 hours ago.

Category: Pontiac

Value: $9

Status: CLOSED

Posted by Ivan 206 days and 22 hours ago.

Answer

Hello XXXXXX, if the radiator cap is rated at 15 psi, it vents at 15psi, but it is venting to the overflow bottle. Since the system is airtight, it will push the coolant into the overflow bottle but draw it back into the radiator as the cooling system enters a vacuum.

Your JA Expert,
Ivan

206 days and 22 hours ago.

Reply

so the cap is not were the water is going

Accepted Answer

No, what is the year, make, model and engine size of this car?

Accepts:
Expert:	Ivan
Pos. Feedback:	100.0 %
Answered:	4/30/2009

ASE Certified Technician

ASE Tech w/ 18 years in the field. Self employed for 9 years. Member of AUTOLAB radio show.

206 days and 22 hours ago.

Reply

2001pontiac grand prix 3.1

Posted by Ivan 206 days and 22 hours ago.

Answer

If you have no external leaks, that leaves only 2 options, the first is leaking into the crankcase which would turn the oil into a milky consistancy. If that is not the case then it is being burnt in the cylinders within the engine. Now there is 2 options for this to happen. The first is that these engines had horrendous problem with intake manifold gaskets failing. This is almost a a certainty on these engines, but there is another far worse possibility, a head gasket. Neither option is cheap. To confirm either of these options require a trained eye and some techniques that can identify which way to travel. If this car has a lot of miles, above 150000, you may want to look for a replacement instead of sinking the money into this one, less than that maybe.

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Question

What psi should the radiator cap vent at. I had to replace the cap and it vents at 13 psi. I can not keep liquid in the it and it is not leaking.

Answer

Hello XXXXXX, if the radiator cap is rated at 15 psi, it vents at 15psi, but it is venting to the overflow bottle. Since the system is airtight, it will push the coolant into the overflow bottle but draw it back into the radiator as the cooling system enters a vacuum. Your JA Expert,Ivan

Reply

so the cap is not were the water is going

Accepted Answer

No, what is the year, make, model and engine size of this car?

Reply

2001pontiac grand prix 3.1

Answer

Related Pontiac Questions

Hello XXXXXX, if the radiator cap is rated at 15 psi, it vents at 15psi, but it is venting to the overflow bottle. Since the system is airtight, it will push the coolant into the overflow bottle but draw it back into the radiator as the cooling system enters a vacuum.

Your JA Expert,
Ivan