2001 Chevrolet Malibu back flowing through resevoir tank

TYLERSDAD1026

MEMBER
2001 CHEVROLET MALIBU
250,000 MILES

I have recently in the last week the thermostat water pump and bled the system and when im driving the car it does good when I stop the car back-flows through the overflow there is no water mixing with the oil and no smoke coming from exhaust

Friday, August 30th, 2013 AT 3:06 PM

5 Replies

SATURNTECH9

MECHANIC
30,870 POSTS

Does the gauge say its over heating when the coolant boils over? If not you might just have a bad radiator cap.

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Friday, August 30th, 2013 AT 6:53 PM

TYLERSDAD1026

MEMBER
3 POSTS

It doesnt have radiator cap it just has the expansion tank the only time that it shows its overheating is when water has gotten to low do to backflow

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Saturday, August 31st, 2013 AT 5:06 AM

SATURNTECH9

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30,870 POSTS

The cap on your expansion tank is your radiator cap sounds like most likely you have a bad cap not holding pressure will do that. There inexpensive I try a new cap.

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Saturday, August 31st, 2013 AT 9:46 AM

TYLERSDAD1026

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3 POSTS

When it boils over it sounds like it has alot of pressure so the cap would do this also

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Saturday, August 31st, 2013 AT 5:52 PM

SATURNTECH9

MECHANIC
30,870 POSTS

Ether the gauge is wrong you have engine compression going into the cooling system or you have a bad cap. A cap is a cheap easy thing to try before trying other things and testing other things.