Question about 1996 Chevrolet Impala SS

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Heating problem The heat in my 96 impala does not come out hot and as I drive becomes colder. I have changed the water-pump, the heater core, the radiator and had the coolant system flushed out twice. The flow logic is right coming through the hoses had that tested. I cant seem to figure out the problem. Had the heater core tested removed lower panel to see if heater core gets hot and it does. It seems as if to much cold air is coming through the blower. Please give some feedback I would like to resolve this problem Thanks.

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  • Anonymous Nov 24, 2008

    I have the identical problem and have changed the thermostat 3x to no avail. The water temp gage will go to normal temp at idle but drops to cool if the car is in motion. In cold wx I have blocked 3/4 of the radiator core and the engine temp still runs cooler than I normal. There is a air bleed screw on the thermostat housing and I have used this screw to purge air from the system - purging might have helped a little, but only for a short time. Also there is a plastic restrictor on the heater inlet hose and I have drilled this several drill sizes larger - I haven't noticed any difference.

  • Qwik96 Dec 31, 2008

    Same her, no heat when the temp drops below freezing...

    Has anyone found the solution yet?

    Joe :-)

  • fhern Jan 11, 2009

    I have the very same problem. I have changed the thermostat and the water pump. I have had the system flushed to include the heater core. All to no avail, the heater still doesn't work. I will check the vacuum lines from the going and coming from the heater controls...

  • laholland Jan 15, 2009

    i have 96 impala ss got it tuned up now heat doesn't work changed thermostat, flushed radiator, checked hoses, checked vacuum lines need help tuned up now the heat doesnt work changed thermostat, flushed radiator



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Does the defrost work.

Posted on Oct 22, 2008

  • butch welch Oct 22, 2008

    I think your heater has a bypass damper that sends the air around the core and I am almost sure it is a vaccum diaphram. Maybe the hose came off or the diaphram has burst. The damper is just a flapper that sends the air thru or around the core. You could also check the vacuum lines going and coming thru the heater controls.


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But have you changed the thermostat in the engine, you are describing a sticking thermostat.

Posted on Oct 22, 2008


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