Question about 1993 GMC Sierra K2500

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Heater not working

I've changed the heater core,thermostat but when i turn the fan on it blows cold air. i take the radiator cap off the the antifreeze is down about one third then goes up and down

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  • 52 Answers

If a radiator and heater core flush doesnt fix the problem then it will be a blend door actuator located on the inside under the dash somewhere in between the middle to the passengers side. Test each one with a vacuum pump until you get heat; the one that causes heat to come out will be the bad actuator.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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stevensj83
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SOURCE: heater wont work

is the thermostate coming from your intake any good its located were your upper radiator hose connects to your intake.under the water inlet housing. if its bad it wont close, if it doesnt close the water doesnt stay in the engine block long enough to heat up. if your a do it yourselfer remove the upper hose from your water inlet. now there should be two bolts holding down the water inlet they should either be 12mm or 1\2 inch remove these bolts. you will need a new gasket once removed or silicone. after removed you will see the thermostate. pop it out . it might be a little stuck, dont worry a little pressure it should just pop out. after you get it out check to see if open's by dropping it into a pot of boiling water for about 20 to 30 min.you should see were the two disks on the bottom come together,should be seperated(if good) if there not seperated you need a new one. just follow these steps in reverse to replace dont forget to clean were the inlet sits on manifold before applying new gasket. and definatly DO NOT OVER TIGHTEN BOLTS just a few turns crisscrossing until nice and snug

Posted on Dec 14, 2008

  • 1 Answer

SOURCE: My 2000 GMC Jimmy has been blowing cold air. We

airjoc does not have a clue to your problem, I take you want to have warmer air not cooler ac. check the control system, if you have a vacum system tou may have a leak, if it is controlled by voltage, check the control panel and the control box. Also open the hood, place the heater on high but not on any defrost setting preferrably on just the floor setting. Start the engine and see if the ac compressor is running. If it is, the control panel is bad.

Posted on Oct 09, 2009

  • 1857 Answers

SOURCE: Heater blowing cold air changed thermostat still

you have a blend door actuator that may be bad. Its a little motor that can be a bear to swap out. Unless your pretty mechanically inclined and have the right tools you may want a shop to diagnose this to be sure.

Posted on Dec 29, 2009

  • 3 Answers

SOURCE: Heater doesnt work blows cold air, replaced

This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.

Posted on Jan 29, 2010

  • 975 Answers

SOURCE: no heat blowing from air

GMC? this is backwards,top hose should be hot,bottom cold,sure it's not a reverse rotation pump,98-99 used 'em, not sure what year you have but the reverse pump will bolt up to any of 'em .Just a thought

Posted on Feb 08, 2011

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