Question about 1999 GMC Envoy

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I have just fitted a new radiator on my vauxhall astra 1.7 TDLS MK4 1999. There seems to be an air lock as the expansion bottle is releasing pressure through the expansion cap every 20 seconds or so when the engine gets to normal running temperature. Also the heater will not blow hot air only cool air. Where do i bleed the system to release the air lock or is it self bleeding? Thank you Alan.

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Look on top of the thermostat housing or anywhere in the system that sits up high as it has to be a high point to bleed off any trapped air. usually there is a small relief valve that you unscrew until fluid runs out. sometimes youmust do this several times to get the job done.

Posted on Jun 02, 2010

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