Question about 2003 Chevrolet Suburban 1500

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I removed the radio and heat/air controller and

I removed the radio and heat/air controller on my 2003 suburban and now it will not idle correctly. Why?

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Did you cap off the vacuum line for the heat/Air controller? Vacuum leaks will mess with your engine's sensors, particularly the Manifold Absolute Pressure Sensor, therefore messing up your mixture.

Posted on May 26, 2010

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I have a 2003 chevy tahoe Lt the air works in front and with back controls but heat is only working in the front it blows with back controls but puts out no heat what causes this?


Your climate system can only cool or heat but not both. The temperature has a big effect on this. The cooling needs the compressor.

Apr 02, 2015 | 2003 Chevrolet Tahoe

1 Answer

How to take the dashboard of my suburban


remove the radio and find the vacuum hoses / wires to the vent controls/module that have become dislodged during the radio fitment.

Jun 03, 2014 | 2003 Chevrolet Suburban

1 Answer

1993 gmc suburban rough idle, stall in reverse


Idle air control (IAC) control rpm idle during idle.

Test it on idle with ALL electrical on full force.
RPM should increase.
If RPM remain the same then IAC is question.

Jan 13, 2014 | 1993 GMC Suburban

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My 2005 suburban AC is blowing hot air; one minute it was blowing out cool air and then it started blowing as if the heat was on....


If you touched any of the A/C controls within 45 seconds of starting your Suburban (after the battery change), you messed up the 'calibration mode' of the HVAC.

Pull the HVAC fuse (10amp) under the hood, and pull the two adjacent fuses (30 and 10amp) under the dash listed as 'climate control' in the manual.

Push the fuses back in, restart your car, but DONT TOUCH ANY of the A/C controls for 90 seconds.

I bet the A/C starts working again normally.

May 06, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

My 2003 suburban has a rough idle sometimes. It


No way to be specific for all the ground leads.... Follow the main lead off the battery and obviously look for any connectors that are connected to the frame/chasis and check for corrosion!!

Mar 23, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

Replaced t-stat and water pump and sill no heat at idle ????


Do you have heat while driving? If you do, it sounds like air is in the system. 1st check the coolant level to make sure it's correct, as low level will cause no heat at idle, and eventually no heat at all along w/ engine overheating.

Dec 10, 2009 | 2001 Chevrolet Suburban

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2003 suburban idles to low.


the idle speed is computer controlled and not adjustable, slow idle is caused by a dirty intake, do the following.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 30, 2009 | 2003 Chevrolet Suburban 1500

1 Answer

2003 suburban rear air works fine but won't blow heat.


This problem is caused by what is called the air temp control blend door, either the door is sticking in the duct or the electric actuator that moves it is defective, the actuator is the common part that fails, the bad news is the dash assembly must be removed to replace the parts.

Feb 11, 2009 | 1999 Chevrolet Suburban

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