Air lock in coolant system
2000 Vauxhall Vectra 1.6 8 valve

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ianb
Driver
3 points

Problem added: Oct 29, 2007 (13 years ago)
My son has had a problem with cooling on his vectra and it then had to have the head gasket replaced. He still has an airlock in the system and has tried everything suggested by his Hayes manual and other sources but to no avail any ideas would be appreciated. Would it be possible that the head is warped and causing a problem?

Any ideas and help would be much appreciated.

Many thanks Ian

Car details
Car: Vauxhall Vectra
Variant: 1.6 8 valve
Model Year: 2000
Category: Engine & Drivetrain
Replies and Fixes
Avatar
fluffyduck
Top Fixer
271 points

Oct 29, 2007 (13 years ago)
Hi, If the head was warped then it would be mixing the water with the oil and causing all sorts of problems, how do you know its an airlock? what symptoms is the car displaying?

Avatar
ianb
Driver
3 points

Oct 29, 2007 (13 years ago)
"Hi, If the head was warped then it would be mixing the water with the oil and causing all sorts of problems, how do you know its an airlock? what symptoms is the car displaying?"

Hi

I will get my son to log on later and post any answers to your question that might help in us resolving the problem .

Many thanks Ian
Avatar
ianb
Driver
3 points

Oct 29, 2007 (13 years ago)
Hi,

I have been trying to bleed the system using all of the methods that I can think of (forcing water in with a hose pipe, unclipping hoses to let air out, you name it I have tried it.). When I let the engine run and the temperature gets to about 90 the radiator is still stone cold. And because of that the fan never kicks in. It is a brand new rad bought about 8 weeks ago. I have had people suggest that either the head is cracked or warped, or that the thermostat is broken. All of the hoses get hot eventually, although the 2 connected to the rad only heat up once the engine temp reaches at least 90.

Any help would be much appreciated.

Thanks Richard.
Avatar
fluffyduck
Top Fixer
271 points

Oct 29, 2007 (13 years ago)
Hi,

You are taking the wrong approach to bleeding the system.
Here's the procedure for bleeding the cooling system.

1.Loosen the air bleed bolt in the thermostat housing, then fill the radiator to the bottom of the filler neck with the coolant mixture. (different mixtures for different vehicles) 2.Tighten the bleed bolt as soon as coolant starts to run out in a steady stream without bubbles.
3.With the radiator cap off, start the engine and let it run until warmed up (radiator fan comes on at least twice). Then, if necessary, add more coolant mix to bring the level back up to the bottom of the filler neck.
4.Put the radiator cap on tightly, then run the engine again and check for leaks.

In your case if the engine isnt getting up to temp then you more than likely have a thermostat problem. get it changed first as they are usually cheap and easy to change.


Of course this is just my opinion and in no way should be deemed as professional advice.


Hope it helps though.



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