Question about 2004 Chevrolet Suburban

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I have a 2004 Suburban, The second row seat controls works the rear heat and air correctly but the front controls do not.

I have replaced the rear control box thinking that was the problem.

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Posted on Jan 02, 2017

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SOURCE: 2001 tahoe front heater not working, rear heater blows warm air

Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

Posted on Jan 18, 2009

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SOURCE: 03 chevy tahoe

There are seperate blowers for the front and rear air. It is most likely either your blower motor or the resistor, both located under the passenger side dash. I got a blower from a salvage yard for $25, But ended up having to get the resister from the dealership for about $130. Hope this helps.

Posted on Jan 20, 2009

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

seans46
  • 161 Answers

SOURCE: 2004 Suburban rear blower motor not working !

You will have a blower motor resistor that controls power and the speeds to the blower motor it will be by the blower motor and is cheap new.

Posted on May 24, 2009

  • 1 Answer

SOURCE: Front heat does not work, rear heat does?

I'm just a regular diy'er, no training. Had same problem, 2001 Suburban, front blew cool air when heating, rear heat warmed up nicely. After reading other posts on other boards, took off the the heater hose clamps (make sure you remember which is which) at the firewall. With low pressure garden hose flushed left inlet/outlet first till I got good flow, then the right side, and back to left. Reattached hoses, started and tested. Heat blows just fine. I can't think of anything that could be damaged by this, but check with someone who know something first before trying it on your vehicle, but it worked for me. So far so good.

Posted on Oct 25, 2009

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There is a blower motor control processor for the back blower - it takes input from the front control and the rear control and decides the fan speed. That processor could be faulty, or the blower motor, or a 30amp fuse in the engine compartment.
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1 Answer

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.

Jan 27, 2009 | 2004 Chevrolet Suburban

1 Answer

Heat blowing cold air in 2004 chevrolet suburban


With coolant full and engine hot,make sure both heater hoses are hot. If not replace thermostat. If they are, check the blend door for proper operation. Otherwise you may have a bad climate control module. Check both front & rear units.

Jan 25, 2009 | 2004 Chevrolet Suburban

1 Answer

No heat or a/c from second row vents


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