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Pressure in radiator

R

roccap

New member
I have a 968 sport, which keeps building up a lot of pressure in the cooling system.
It also appears if I get caught in traffic to keep spraying its coolant around the engine bay.
My initial thoughts were head gasket, especially as I seem to get a bubbling noise if I take
the radiator cap off listen.
Took it to local performance garage, that does quite a few porsches, and they did compression
tests etc and said headgasket is ok and they reckon its borking coolant because of trapped air.
I could understand this if pressure in system was only there when warm, but once engine has warmed
up, pressure will stay in the cooling sytem if if I wait 24 hours to get it really/truly stone cold.
Any ideas?

Paul

ps I would say its down on power, it gets to 100 pretty quick, then drags getting to 120
and seems to top out about 130.
 
I'd guess it's a very similar setup to the 944 cooling system, and they do get airlocks. Needs to be bled parked facing uphill, I had exactly the same symptoms once on arrival at my indie and it took him no time to fix.
 
Thanks for the response.
I can understand the problem with trapped air, expanding and causing a problem while the car is warm.
What I can't understand is how the pressure remains once the car has cooled down and the air pockets have returned to their original volume.

Yours baffledly.

P.
 
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