Question about Nissan Pulsar

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My pulsar gtir has a froth developing on surface when leaving the radiator cap off!is this an airlock issue is it something more serious?i think its an airlock due to the fact that the expansion bottle rises dramatically and there is no creamy substance in water or engine oil cap to imply that the head gasket as gone!you could here a gurgle sound on starting up the engine and switching off the engine!please help!!thanks!

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Taken the cap off expansion bottle put the heater on full start engine then the bubbles work there way out

Posted on Feb 09, 2010


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It sounds like you have a radiator leak, and that you are therefore low on coolant, and the engine is overheating. With the car stone cold, open the radiator cap and top off the coolant as full as you possibly can, then replace the cap. While you have the cap in your hand, inspect the rubber gasket that seals it when it is installed. If that gasket is not in good shape, the normal operating pressure will force coolant into the radiator excessively, leaving not enough to cool the engine.

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