Question about 2003 Chevrolet Trailblazer Ext

1 Answer

Cold only out of passenger side. Already replaced blend door and calibrated it. Thermostat recently replaced and system flushed with new dex cool put in. What else could this be? Heater cntrl mod?

Blend door actuator already replaced and calibrated (twice) so that can't be it. I had warm air first day, set temp cooler on a warm day, then tried to make warmer and it won't change now. Only on pass side. Fan speed also only works on 5, just ordered new resistor for that, haven't got it yet. Someone said do a temp relearn which I will try today. My system is manual with the dual controls

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  • John Pape
    John Pape May 03, 2015

    This does not have separate actuators for each setting like a suburban as someone suggested. There are only 3. 2 in front (pass/driver) and one for the rear controls. What I have learned is that EVERY time the battery in this truck is disconnected, EVERYTHING must be recalibrated and that sometimes causes things to go bad or stop working. My mechanic usually does not do these trucks anymore because of that. Chevy wants $85 to recalibrate it all with a Tech 2 but I did it all manually and it works now. The manual temp reset has all the blend doors working properly now, even the rear which I gave up on!

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  • Chevrolet Master
  • 14,585 Answers

Since you have dual control, you have two blend door motors.

Posted on May 03, 2015

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Posted on Jan 02, 2017

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chiquititas
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SOURCE: AC is blowing out HOT air... How to get to the Blend Door to check it?

No, you just need to fill freon gas.

Posted on Jun 25, 2008

aaangie220
  • 202 Answers

SOURCE: 2004 suburban rear a/c only blows hot air

ase mechanic:
there are separate actuators for the blend doors. one for heat and one for cool. they work opposite and in conjuction with each other, if that makes any sense. ones open, ones close, for each different climate. sounds like the the cold one isn't opening in the rear.

Posted on Jan 29, 2009

juncro
  • 467 Answers

SOURCE: 1999 Buick Century Replace Air Temp Control Blend Dr Actuator

yes its hard to reach, you must used an extension.

Posted on Jul 23, 2009

  • 1 Answer

SOURCE: 2000 Chevy Silverado 1500 The heater does not

Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

Posted on Oct 06, 2009

  • 1 Answer

SOURCE: Replace Blend door on 2004 Suburban

My problem is hot air on the drivers side, cold on Pass when the AC is on...2004 Sub

Posted on Nov 06, 2009

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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1 Answer

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It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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1 Answer

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
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