Question about 1993 GMC Sierra

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93 gmc sierra heater not working

I have a 93 GMC Sierra 2500 diesle and the heater is not blowing warm air just a few days ago the heater was blowing hot hot air now nothing

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  • chevyhpdude Feb 21, 2009

    I have a 93 GMC Suburban 1500 5.7 TBI.It stop blowing hot air.I checked coolant.It was low 1/2 gal. I refilled while engine was warm and running (thermostat open).I topped off radiator with idle up and put cap on.Radiator,hoses,thermostat,waterpump,oem flex fan and fan clutch is new.Worked fine for 4months now blows luke warm or cold.

  • Anonymous Mar 16, 2014

    Gas gauge and heater quit working

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THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER

Posted on Jan 04, 2009

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What is causing the heater in my 2002 GMC Sierra to blow cool air when in idle? It sometimes takes 15 minutes or longer to blow warm once I'm driving but it still doesn't blow hot, just a little warm. ...


It could be a few things. First try to see if all of the vacuum lines are connected. It there is a leak the system will not work properly. It could also be the heater switch causing the problem.

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Check to make sure the motors are moving hot to cold. The blinking control panel means it has self diag mode. Google how to get the heater control panel to go into self diag mode and when you get codes goggle them too . Prob bad control panel switch or unit

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Inside air temperature sensor? Does your Sierra have automatic temperature control for the heater/air conditioner?

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I own a 93 GMC and I have had this happen a few times, First its a chevy they are cold blooded take a bit to warm up and get heat. That and im sure the oil had not warmed up and gotten up to the top end. Let it warm up then try it out.

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1 Answer

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you have a couple of problems first of all your drivers sd=ide heated heat pad is probably faulty, for your heating problem you may have to get the hvac doors recalibrated.

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