Question about 1991 Chevrolet C1500

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Heater want get hot

Heater wont get hot. changed thermostat ,heaterhoses the engine get up to normal temp it just dont get hot inside the cabWhen I switch my heater on it only blows cool air the hoses to the heat exchanger are getting hot the thermostat is new. The AC works fine but when I switch over to heat it keeps on blowing cool air out of the vent and bottom openings.

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  • Poellas Dec 11, 2008

    Water pump is new to, endinee does not get overheated goes up to normal operating temp.

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Hello,

Sounds like the valve (flap) inside the dash is not going to the heater side to direct the air. You should hear a softer "clunk" sound when the heater is turned on and the valve (flap) switches.

I don't remember if the system in this vehicle is vacuum...you might want to check any vacuum lines to make sure that they are not leaking/disconnected.

Hope this helps you...

Posted on Jan 07, 2009

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Are both the inlet and out let hoses to the heater core hot... the same temp (by feel).

Robert

Posted on Jan 07, 2009

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If the 2 hearter hose that goes to the heater core are hot our suppose to have heat if only 1 is warm the heater core block remove hose pas water hose on both side if the 2 hose are hot with no heat the trap under dash doesnt move pierre

Posted on Dec 11, 2008

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Check whether the switches or the controls which lets you the hot air is in the correct position.check whether the hot air is pumped through the tube to the inside air port.thank you

Posted on Dec 11, 2008

  • JITHIN ANTONY Dec 11, 2008

    a blown off hating element may cause the system not to work properly

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Check out the heater core and if want to replace The heater core should be located on the passenger side just below the dash. There should be a plastic cover over the core that will have to be removed first.
But, before you remove the heater core, make sure to drain the cooling system of antifreeze and add NEW antifreeze after completing the repairs.
First, drain the cooling system. Then, trace the 2 black rubber lines from the water pump to the firewall at the heater core and disconnect them. now move to inside of the truck and locate the heater core cover and remove it (carefully though, these things will crack easily). You should then be able to access the heater core and remove it ( there will be a couple of metal straps that hold it in place...just remove one of the small mounting bolts for each strap).

Posted on Dec 11, 2008

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Hi first make sure the coolant system has no air in it, it could be the water pump (does it get hot when driving the car) or last it it be the heater core matrix, Hope this helps

regards Steve

Posted on Dec 11, 2008

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