I took heater core cover off again and discovered top band was not tight and bottom band on heater core was not fastened at all. This resulted in about a 3/8 inch to 1/2 gap between the heater core and the flat plastic it was to secure up tight to, therefore allowing cool air to cirulate around it while it was trying to warm the air coming to it. Does this make sense? Should it not have some type of insulation around it where it sits up tight with the two metal bands on top and bottom of core? Thanks Just put new therostat in it, and all vacuum control working fine.
yes it should have a foam insulation which it sets in...the bands should hold it there.
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