Question about 2003 Chevrolet Tahoe

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MY 2003 CHEVY TAHOE'S HEATER IS BLOWING COLD AIR WHY IS THIS?

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You need a new thermostat or your thermostat is stuck.  Go to the auto parts store and pick you one up for cheap.  Their fairly easy to install if you got the tools and are somewhat handy.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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SOURCE: blowing cold air

I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Posted on Feb 27, 2009

  • 507 Answers

SOURCE: 2003 chevy tahoe no rear heat

I know the earlier tahoe's have two heater lines running from the engine compartment to the rear under the vechile. Those lines could be clogged or pinched shut. What you do is get two hose locking pliers. Go under your truck, they are two metal lines that turn into rubber and back into metal again farther down the line. First, checked for pinched lines. If none, find where the rubber hoses are, clamp them off, remove from metal lines and drain. Use garden hose to flush fresh water through. When water comes through at high pressure and pretty clear, it should be done. Reconnect hoses, top off radiator fluid and it should be fine.

Posted on Feb 21, 2009

  • 270 Answers

SOURCE: 1996 Chevy Tahoe air conditioning not blowing cold air

That "thing" is part of the compressor clutch. When it’s spinning the clutch is engaged, when it stops the compressor is off. If it’s constantly cycling, you probably don’t have enough freon in the system. But remember, however the gas escaped before, it will escape again, unless you fix the leak.

Posted on Jul 15, 2009

  • 54 Answers

SOURCE: 2004 chevy tahoe, dual climate control, blowing different temps

Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck

Posted on Jul 29, 2009

  • 4336 Answers

SOURCE: grand cherokee heater blows cold air

Check the coolant level, sounds like you may be slightly low....Be sure heater is on high when filling the system....Look for any air bleeds...

Posted on Dec 06, 2009

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Passenger side blows cold air--what part could it be


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Flush out heater hoses.Could get clogged up after a while.If you don't use coolent in the cooling system.

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1 Answer

My 2003 Chevy Tahoe is blowing a/c from the two vents that face drivers side, but are blowing heat from the passenger (2) vents (while a/c is on not heat). I was told that there is a way to re-set the...


Hello: You have a temp actuator that has failed. Set the temp for 90 degrees then check and see which side is blowing cold, the actuator for the driver side is on the center bottom of the heater case, the actuator for the passenger side is on top of the heater case (the dash has to be removed to replace) There is no re-programming for 2003 and back. After replacing the failed actuator you will have to re-calibrate all doors. One other item you can check is open the passenger side front door, remove access panel on end of dash and make sure all connectors are fully connected.

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Start by flushing your coolant system and replacing your thermostat. You may later find that you have a clogged heater core.

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is the car over heating? if so the coolent system has an air block take collent cap off and run till gauge shows warm make sure you turn the engine off the minute the coolent stops bubbleing our ur gonna get very wet! hope this helps. jezza

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That "thing" is part of the compressor clutch. When it’s spinning the clutch is engaged, when it stops the compressor is off. If it’s constantly cycling, you probably don’t have enough freon in the system. But remember, however the gas escaped before, it will escape again, unless you fix the leak.

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Its probably the temperature actuator located in the right rear interior

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