2001 Montana-overheats-blows cold air

WAUSAUFRANK

MEMBER
2001 PONTIAC MONTANA

I have a 2001 pontiac montana, the other day coming home from work (I live in wisconsin and it is around 10deg.F)and the temp. Gauge shot up to overheat and cold air started coming out of the vents. I took it home and turned the radiator cap so the fluid went into the overflow and took it for a ride, it seemed to work thre was hot air coming out of the vents. I drove to a friends garage and his buddy said it was the thermostat.I said I did not think so but agreed it wouldnt hurt to change it. When I picked it up it was blowing cold air again, and overheated right away.(The head gasket was replaced about a year ago, and the symtoms seem different), fluid seems full(maybe a bubble)no radiator fluid in the oil.

2 Replies

SERVICE WRITER

MECHANIC
9,123 POSTS

My first impulse was an intake gasket, but that was done with the heads, my next thought is a bad t-stat, but you replaced it. Maybe a 2nd bad t-stat?

I know I know, it sound silly.

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Tuesday, January 30th, 2007 AT 7:54 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

You dont sound silly Paul, seen it a bunch. Those van are a little tough to get the air out of sometimes. There are usually 2 air bleeders, one at each end of the engine. See if you have air trapped in the system