head gasket

TOYOTA
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SOPHIE
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Hello i have a 1987 toyota 4x4 pickup with a 22r engine 15000 miles it runs very strong but boils the coolent out when i install a thermostat i tried 3 differant ones if i dont run one it is ok but winter is around the corner and i need heet i tried flushing the cooling system and did a presure test on the radiator cap and cooling system and all came out normal think it could be a head gasket??? thanks to any one who can help
Sep 26, 2007 at 6:26 PM
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RASMATAZ
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Try bleeding the air out might worked. See below-don't work we continue till we locate the problem.

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.
Sep 26, 2007 at 8:24 PM