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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Posted on Jan 04, 2009


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2 Answers

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.

Jan 08, 2015 | 2002 GMC Sierra 1500

1 Answer

K so I have replaced all of the blend air motors and then also have changed out the thermostat on my 93 gmc sierra and also have changed heater core out and it still blows out cold air I can switch where...

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

Oct 24, 2013 | 1993 GMC Sierra

1 Answer

What is the round perforated disk above the driver in a 03 gmc sierra 2500 it is about the size of a toonie .....

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

May 21, 2010 | 2003 GMC Sierra 2500HD

2 Answers

2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Jan 07, 2010 | 2005 GMC Sierra

1 Answer

It takes the heater a long time to heat up

needs a thermastat or your low on coolant

Jan 03, 2010 | 2004 GMC Sierra 2500

1 Answer

Went to start my truck Sun morning and it idled very sluggishly. When it was given the gas it hesitated. Applied brakes and it died but started right up. No warning hadn't driven it for a couple of days,...

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.

Nov 02, 2009 | 1993 GMC Sierra K1500

1 Answer

Heater not blowing warm air. Thermostat has been

Check the water control valve behind the engine close to the firewall. This valve opens and closes to allow hot coolant to enter the heater core. It is usually connected to the heater controls with a cable. When you adjust the heater control for heat, a cable activated lever on the valve should move and allow coolant to move through the valve. The cable from the heater control can come loose from the lever, or the valve itself can become corroded and hard to move.

Oct 16, 2009 | 1993 GMC Sierra

1 Answer

2005 gmc sierra 2500hd heated seat turns off

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.

Oct 05, 2009 | 2004 GMC Sierra 2500

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