vauxhall vectra b 2.0i 16v possible over heating problem?

my vectra is doin the same, when im in traffic or standing still my water starts to boill and steam strart to come out. can you help?

ste
January 2010

I assume the gas test was a "sniff test" for hydrocarbons (exhaust fumes) in the coolant. The negative result would suggest it's not head gasket failure, but it might be still worth doing a compression test as steray suggests. (Easy for me to say as I have the tools, so it doesn't cost me.)
If it was my car I'd check the radiator for blockages. Take it off and give it a good flush with a hose. Remember to run the water through in both directions.
How did you check the water pump?
Is your coolant mixture correct, when was it last changed? Anti-freeze raises the boiling point as well as lowering the freezing point.

murf
July 2009

hi mathew, have your car compression tested on each cylinder it may be the head gasket best of luck

steray
July 2009