Question about Chevrolet TrailBlazer EXT

2 Answers

When air conditioner pump clutches ingage and disengage the RPMs drop up and down... bad gas mileage... stalled once when i was at a four way stop and went to go... when temperature was all the way down and off then it was fine. HeadLights has dimmed in and out while driving.

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 4,803 Answers

Well, lets see...
The engine RPM going up and down when the A/C clutches engage and disengage sounds like it could possibly be caused by an Idle Air Control (IAC) that cannot properly control engine speed.
The headlamps dimming on the other hand, leads me to think that you may have charging system problems - loose cable connections, bad alternator diodes, shorted cell in the battery, etc.
Then again, if the engine is not idling correctly due to a bad IAC, it can cause the headlamps to fluctuate if the A/C is kicking on and off at idle.

So here are my recommendations:
First, get your charging system load-tested. Correct any problems found and see if this fixes your problem with the stalling and the dimming headlamps.
If a load test does not identify any problems with the charging system, try replacing the IAC.

Also please review this article: What Else Could Be Wrong?

Posted on Apr 11, 2011

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have a 1995 hands civic with a 1.6l vtech. The car idle goes from about 1.5 to about 1 constantly. So basically when I'm in natural the idle won't stay in one spot any solutions?

Posted on Apr 11, 2011

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I tried to add freon to my air conditioner but the gear won't kick in

make sure all the electrical plugs are free of corrosion and pluged has to have a certain amount before the pump clutches will ingage the pump. pump could be bad also.

Jul 24, 2014 | 1999 Saturn Lw 4dr Wagon

3 Answers

97 honda accord rpm drops to zero while driving

Possible Low Fuel Pressure I Would Test The IAC (Idle Air Control Valve) First

Nov 06, 2013 | 1997 Honda Accord

1 Answer

Hyundai air conditioner always on

The AC will come on when the DEFROST is on.

The AC Compressor has a Clutch on the front. You can see if it is engaged or disengaged

Apr 10, 2013 | 2006 Hyundai Azera

1 Answer

My 1993 Olds Cutlass Supreme drives great most of the time. But after putting gas in it, as I am tooling along within the next 1/2 hour, if I slow down to turn or stop, the car begins to shudder and...

The problem is " The Torque Converter Clutch, (TCC) solenoid" is what actually causes the TCC to engage and disengage. When the TCC solenoid receives a signal from the ECM, it opens a passage in the valve body and hydraulic fluid applies the TCC. When the ECM signal stops, the solenoid closes the valve and pressure is vented causing the TCC to disengage. If the TCC fails to disengage when the vehicle comes to a stop, the engine will stall. This is a common problem with older GM vehicles.

Oct 24, 2010 | 1993 Oldsmobile Cutlass Supreme

2 Answers

Runs fine then it just stalls. Wait awhile and it runs fine then stalls again

Sounds like a crank sensor. That would be my starting point

Nov 11, 2009 | 1991 Pontiac 6000

1 Answer

I have a Mistubishi eclipse GS 2.4 four cylinder the car idles extremely low and sometimes dies when i am sitting at stop lights out of gear or when i come to a stop and have it in nuetral. But when i turn...

your idle speed too low.take it to a dealer.they have to reset should be 600-800 rpms.when you turn on air conditioner.the computer steps up idling to keep engine from stalling .your curb idle too low.

Jun 22, 2009 | 2001 Mitsubishi Eclipse

1 Answer


Easy fix... Take a gallon of gas and a clean cloth or shirt. Soak the cloth in the gas and wipe all the interior down with the gas.

Then poor some of the gas all over the engine, making sure to soak it really good

After doing this, take a match and burn that f**ker..
Mine was doing the same thing, I burned it and blamed it on Islamic jihad to my insurance. Never looked back

Mar 24, 2009 | 2005 Chevrolet Cobalt

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

133 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8210 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides