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Posted on Mar 14, 2010
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Replaced coolant sensor on my 2004 GMC Envoy XL 6 cylinder. I had to disconnect the battery and alternator. All was reinstalled,truck runs fine but when I turn on the a/c the truck turns off and idles roughly.

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Sounds like ac compressor is dragging.It might be that rpm is to low also.Step on the accelarator and if you have a tach bring rpm up to 700 to 800 in drive which is were it should run with ac on. With ac off rpm should read around 600 in drive.

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Sometimes when you disconnect the battery, the vehicle has to be driven for several miles for the computer to re-learn

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Related Questions:

0helpful
1answer

2004 Envoy xl 4.2 v6 PO302 cylinder 2 misfire which is the number 2 cylinder?
It's in order, from the front of the motor to the firewall. #1 is nearest to the radiator, # 6 is at the firewall.
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Mar 30, 2015 • 2004 GMC Envoy XL
0helpful
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Battery not charging indicator. What could be my issue?
Who did the testing & did both the
battery & alternator fail at one time?

Auto Zone has a repair facility & did the work?

What codes are present?

Did anyone look at a data base, to see what
the message your getting was & the solution?
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Aug 16, 2014 • 2004 GMC Envoy SLT
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What causes my 2004 GMC Envoy XL 4.2L to Intermittently Stall No Codes
Check the oxygen sensors.
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Mar 11, 2017 • 2004 GMC Envoy
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How to replace engine coolant temperature sensor
Drain coolant, remove alternator and bracket. Unscrew the sensor from the block after you have disconnected the wiring. Might as well replace your thermostat while your there and no coolant in the system, it's cheap.
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Jan 29, 2011 • 2004 GMC Envoy
0helpful
1answer

I have a 2004 GMC Envoy. I have a P0106 code that has been cleared and again returned. I have replaced the fuel cap and the MAP sensor. What should be the next thing that I look for?
Check the intake manifold for loose or leaking hoses. Also, clean your throttle body with throttle body cleaner, WITH the battery disconnected. After done, drive for 5 miles or so.
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Dec 28, 2010 • 2005 GMC Envoy Xl
3helpful
1answer

How to remove the alternator
On a 2004 GMC Envoy xl v6, the alternator has 3 mounting bolts, 2 on top, 1 on bottom. best advice is to disconnect the electrical circuits to the alternator first before removing the mounting bolts. then take off the bottom bolt, followed by the 2 on top. then just slide it out and your done.
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Dec 17, 2010 • 2004 GMC Envoy
1helpful
1answer

My "GMC Envoy 2003 XL SLT 4.2 liter 6 cylinder",check engine light came on.every morning i start the car to warm-up and it's o.k. but then when i put it on drive"It starts to shake when i step on the brake...
First thing to do is to clean the throttle body and throttle plate thoroughly. While performing the cleaning, disconnect the battery for about 30 minutes. This will force the PCM to relearn with a clean throttle body. See if this helps with running and the codes. Also make sure the gas cap is tightened properly.
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Sep 29, 2010 • 2003 GMC Envoy Xl
3helpful
1answer

Trouble locating cooling sensor on 2003 gmc envoy
4.2L Engine To Remove:
  1. Disconnect the negative battery cable from the battery.
  2. Drain the coolant from the engine.
  3. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation gm-04-42-1509.gif

  4. Remove the engine coolant temperature (ECT) sensor from the engine.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the engine. Torque the sensor to 12 ft-lb (16 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.
  5. Connect the negative battery cable to the battery.
5.3L & 6.0L Engines To Remove:
  1. Drain the coolant from the engine.
  2. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation removeect.gif

  3. Remove the engine coolant temperature (ECT) sensor from the left cylinder head.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the engine coolant temperature (ECT) sensor into the left cylinder head. Torque the sensor to 15 ft-lb (20 Nm).
  3. Connect the engine coolant temperature (ECT) sensor connector.
  4. Refill the engine with coolant.
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Jul 08, 2010 • 2003 GMC Envoy
0helpful
1answer

Service engine light is on
if its a 6 cylinder the sensor is located on driver side behind the alternator .the sensor alone is about 80-100 dollars. but it is difficult to get to if you dont know what you are doing. the shop should charge you 150 to have this done.
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Apr 19, 2009 • 2003 GMC Envoy Xl
28helpful
5answers

Check engine light on - 2003 gmc envoy XL
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.
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May 18, 2008 • GMC 2003 Envoy XL
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