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Heat goes cold at stop signs - Acclaim Plymouth Cars & Trucks

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Have cooling system flushed properly which should improve circulation through heater core at idle, or low rpms. I usually flush heater core with C.L.R. (calcium, lime, rust remover) from hardware store before re-filling cooling system by removing hoses to core at firewall, and hook up to a small drill driven pump (also available at hardware store for approx$10). I use that to circulate it through core, and reverse hoses and pump it through in both directions, then let it sit in core overnight if at all possible, just for better cleaning. Drain it next day after circulating a little more, and re-fill cooling system. Be sure to leave rad cap off and heater turned on when re-filling coolant, and allow rad fan to come on and off 2 or 3 times before topping up and putting rd cap back on to be sure all air out of system. Should see improved heat at idle.

Posted on Feb 01, 2014


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Posted on Jan 02, 2017


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