Cars & Trucks Logo

Related Topics:

D. Van
D. Van Posted on Aug 18, 2014
Be the first to answer

Why does my a/c not always work

A/c may or may not work when we start the engine but usually starts working after while and works good and cold.When not working the fan don't come on and there is a line through the snowflake on the control panel?

Answer This Question

4 Related Answers

Anonymous

  • 702 Answers
  • Posted on Aug 21, 2008

SOURCE: Fan speed switch only works on #5

Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.

Ad

Anonymous

  • 100 Answers
  • Posted on Feb 16, 2009

SOURCE: heater fan don`t work and the fuse is good

you need to check your wiring to the motor and ascertain if you have a positive and negative feed to your motor to see if your motor is ok, see if you can put a feed directly to the motor to prove it, if the motor runs you have a wiring problem elsewhere

johnjohn2

Johnny Brown

  • 5763 Answers
  • Posted on Jan 03, 2010

SOURCE: on my wifes 2004 yukon, the engine warms up and

iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.

Testimonial: "thanks a million. with your advice, im betting its the selector motor. i'll give it a shot. "

tuyen bui

  • 1025 Answers
  • Posted on Feb 24, 2010

SOURCE: 1993 gmc z71 blower fan cuts out & digital

check the ground.

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

0helpful
1answer

Miller Big 40 diesel will not start unless I use starting fluid. Then once it starts I can start all day long until I let it sit over night. Then I have to use starting fluid again. How do I fix this so I...
I am not familiar with the engine.

Indirect injection diesels need a cold start device in all but the most mild of weather conditions - mostly this is accomplished with the use of in-cylinder heater plugs but these might or might not be supplemented with an excess fuel device or an intake manifold warmer.

Direct injection diesels lose much less heat during compression and so an engine in good condition will usually start without aids in temperatures above freezing though most engines will incorporate an excess fuel device, manifold heater or in-cylinder heater plugs to cope with low temperatures.

The first thing a diesel needs for good starting is a good cranking speed and excellent compressions followed by good injector spray patterns and that is usually enough to ensure reliable starting of a direct injection type.
An indirect injection type is even more needful of good compressions and a good cranking speed and also requires good injector spray patterns but will also need any cold starting aid to be working properly.

I suggest you begin by learning about your engine.
Read full answer
Feb 08, 2020 • Cars & Trucks
1helpful
1answer

Heat problem. Heater only works sometimes. Blows out almost AC temperature majority of the time. No engine overheating problems. May or may not be related to actuator issue (vent always open)
Check to see if your heating system is properly filled. Air in system can often prevent the proper flow of hot coolant into the radiator core resulting in your issue.
Read full answer
Oct 20, 2015 • 2002 Chevrolet S-10
2helpful
1answer

2002 daewom lanos have 4 codes po118...1627..both duplicated but with pd at end of scan screen..tried to find temp scensor..b ut know go..both fans come on stay on even with engine cold ..a/c does not
Sensors should be in the bottom of the radiator.
Read full answer
Sep 12, 2014 • 2002 Daewoo Lanos
0helpful
1answer

Why does my a/c not always work
Have your A/C serviced just to make sure you have the proper amount of freon in the system. If you don't have the right amount, the system will work on occasion when the pressure is just right and won't be constant. The fan works on 2 separate systems. One is to prevent overheating of engine and the other is the a/c. If the pressures aren't right, it won't turn on either. The compressor pumps the freon into the condensor and it's under high pressure. The fan turns on to cool it off... If there isn't enough refrigerant, there's nothing to compress and it won't work. Hope this helps.
Read full answer
Aug 18, 2014 • 2003 GMC Yukon
0helpful
1answer

Dies when I first start have to restart a few times and dies at stop light unless it gets a little gas
This is usually a problem caused by a bad water temperature sensor. There are usually 2 sensors with one working the temperature gauge and the second working engine controls.

The "cold start" sequence is similar to a choke in old cars. It needs the signal from the water sensor to trigger the cold start sequence. The cold start sequence enriches the fuel charge, adjusts timing, and increases idle speed until the engine gets a little warm.

Now if stalling when warm, you have other issues. Manifold runners are a problem on some engines.
Read full answer
Feb 12, 2014 • 1999 Ford Taurus
0helpful
2answers

2002 nissan sentra wont start when its cold outside
NEED A BATTERY WITH MORE COLD CRANKING AMPS.
Read full answer
Jan 23, 2014 • 2002 Nissan Sentra
0helpful
1answer

99 rodeo starts hard after is has been warmed up. Starts fine after it has been sitting overnight. Almost starts like it is flooded. Have changed O2 sensors, coolant temp sensor. Cleaned IAC
Hello, I usually work on Ford family Brands. There are sometimes 2 temperature sensors on engines. One is meant for the dash gauge alone and the other is for the Engine management systems.

You could have one of several problems. A starter can sometimes fail becauseof heat. You would need to do a draw test when the motor has been run to duplicate your problem. Autozone, Advance, and Oreillys are some of the free test places.

The cold start cycle is like an Electronic choke. If the temperature info is not reaching the Engine management controls then the vehicle will always be set for a cold start.

Lean conditions also can lock an engine. In order to get good mileage the Camshaft timing is advanced. If the engine has worn timing parts, the firing may advance beyond specs. You may be fighting compression and experiencing vapor lock. Try going up a Grade in gas Octane.
Read full answer
Nov 18, 2011 • 2000 Isuzu Rodeo
0helpful
1answer

96 mercury mystique which has always had problems. this is my daughters car and she has had problems with it randomly stalling. there does not seem to be any pattern. if she leaves it sit for a couple...
Hello,


Something that you may want to check, or have checked is the, ( MAF ), " mass air flow ", sensor.
Some of the symptoms are, bad idle, loss of engine's power, stalling, and eventually preventing the
engine from starting, especially in cold weather.

This is usually easy to check;
This sensor is usually located in the air intake duct system, ( the duct system that the air filter is in )
between the air filter and the engine. Most have a plug with 4 or 5 wires. Very carefully disconnect
the plug. If the engine doesn't start either remove the battery cables and clean them very good, or try to jump start the engine. Once the engine is running leave the plug off and go for a short test drive to see if you notice the engine performing better.

You can drive while this is disconnected, but try not to do that too long. It can cause other sensors
to trigger the, " check engine light ", and over a longer period of time can damage the catalytic
converter.

Some handy people go to a parts store and get, " mass air flow ", cleaner. It does seem to work well, but you have to follow the instructions very closely.

I hope this helps you.
Read full answer
Feb 02, 2011 • 1996 Mercury Mystique
2helpful
1answer

1997 chevy astro van has poor starting problems after it sits all
hello ralph...check the coolant temp sensor. It acts as a choke to richen fuel mixture when cold. If it doesn't work correctly, hard starting will occur. Once engine reaches operating temp, the problem is usually non-existent. also....
Worn spark plugs.
Fouled spark plugs.
Worn distributor cap and rotor.
Old ignition wires.
Low engine coolant level.
Faulty MAP sensor...any of these will effect cold starting....

Good luck...i hope this helps.
Read full answer
May 17, 2009 • 1997 Chevrolet Astro
0helpful
1answer

ETC
You need to change the thermostat, it must be stuck open and the computer thinks the engine is always cold, hence the fast idle and smoke.
Read full answer
Sep 22, 2008 • 2000 Ford Expedition
Not finding what you are looking for?

View Most Popular

2003 Yukon

  • Cars & Trucks

Related Question

Miller Big 40 diesel will not start unless I use starting fluid. Then once it starts I can start all day long until I let it sit over night. Then I have to use starting fluid again. How do I fix this so I...

  • Cars & Trucks

64 views

Ask a Question

Usually answered in minutes!

Popular Questions

What do codes B2AAA and B2A00 mean?

2008 GMC Yukon

My instrument cluster not working on 04 gmc yukon

2004 GMC Yukon

I have code C0281 WHAT IS IT AND HOW DO I FIX THE

2000 GMC Yukon

What does RFA 1 battery low mean?

2003 GMC Yukon

Service tire monitor on what is the problem? how

2006 GMC Yukon

Check Out the Latest Top Trucks Report!
Check Out the Latest Top Trucks Report!

View all Fixya Reports

Top GMC Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

john h

Level 3 Expert

29494 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

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

Answer questions

Manuals & User Guides

Loading...