Question about 1990 Ford F150
Run engine from cool, with rad cap off & heater on heat (not AC) and watch for circulation through rad when engine reaches normal operating temperature. Rev engine slightly from time to time for a couple of seconds, to increase flow & help bleed air out of system. Let it run for a while, and watch for increased flow in rad 2 or 3 times. Probably see air bubbles at same time.Hot coolant from engine comes in top, and back out bottom to engine after cooling in rad. The increased flow in rad ,indicates thermostat is opening & circulating cooler liquid back into engine. After 2 or 3 times put cap back on & fill return bottle only to line specified as warm/hot engine level.
Posted on Feb 20, 2009
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Posted on Jan 02, 2017
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