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Old 03-04-2006, 02:07 PM
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air in cooling system

It appears that I have air getting into the antifreeze / cooling system.
The temperature gauge keeps going (260*) up but the actual water temperature is not that hot.
I can see bubbles rising in the overflow tank. Can you get air in the system if the intake manifold is leaking. The mechanic I brought it to seems to think that's where the air is getting into the system and causing all the problems.
He thinks I should replace the intake manifold gasket and that **might** solve the problem.
Any thoughts on wether this sounds right or not. If not where would the air get into the system from?

Thanks, Mark

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Old 03-04-2006, 02:22 PM
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Head Gasket is the likely cause.
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Old 03-04-2006, 02:28 PM
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Or a generic coolant leak. The radiator pushes excess coolant to the catch tank, then when it cools down it sucks coolant back in. If you're leaking somewhere it will suck a bit more in from the recovery tank each time until its sucking air back in.
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Old 03-04-2006, 02:30 PM
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The tank level is always the same so I don't think there's a leak.
Wouldn't there be water in the oil and oil in the antifreeze if it was a head gasket.
Everything looks fine in the oil and coolant
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Old 03-04-2006, 02:39 PM
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No, just because a head gasket is bad doesn't mean water in the oil. It depends on where the gasket when bad. Bubbles in the cooling system tank, and radiator if you took the cap off is a sure sign of a head gasket. Your putting pressure into the cooling system and the only place it can come from is the cylinder.

There is no pressure in the intake, only vacuum. If you had an intake leak you'd either be sucking antifreeze INTO the intake and blowing white smoke, or oil into the intake, blowing blue smoke.

Worst case is your block is cracked.
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Old 03-04-2006, 04:34 PM
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Doc here,

First line of defense:

Park or jack the car up on a slight front incline..

Open the cap and fill the system on a warm engine (just shut off) Being careful as you open the cap..until the water spills over the top of the filler tube.

Get a low pressure cap..about 5 or 10 lbs if you can find one.

Place that on the radiator and start it up , observe the coolant recovery tank..as it heats up you should have bubbles, and water blasting in and out..(be sure the tank is full) What this does, is expels air trapped in the system, and replaces it with coolant.Burping the system.

If the system won't burp or have activity in the recovery tank on the low pressure tank, check your hoses between it and the radiator, It may be leaking sucking air back.

If it burps, then shut it down, replace the cap, and test drive it.

If you still have problem, Second line of defense:

Get a radiator / Cooling system pressure tester, and pressurize the system. It should hold pressure at the maximum PSI , Do this warm, with the T'Stat open.

If not, get some dye from the local radiator shop that tests for exhaust gas in the water and run that test.

If you had manifold leaks or head gasket leaks, you'd have performance issues..you should be able to note right off..

Doc.
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