AC not working

Sound's like you have a bad mode door actuator or broken mode door your going to have to get in there and see which.I would say most like the actuator not uncommon on those cars.

These guides will help fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

and

https://www.2carpros.com/articles/replace-blend-door-motor

Please run down these guides and report back.

(1) when the envoy is started, the air conditioner works fine, and blows cold air through the vents.
(2) after about 30 minutes the air speed gets slow through these vents, and becomes less cold.
(3) additionally, i noticed small ice pieces (tear drop size) spitting out from the vents every few minutes.

have this checked for freezing up it may not have anything to do with blower speed but you may need a evac and recharge. due to moisture in system. for the blower check harness going to resistor and blower motor draw it may be one or the other or both.

This guide can help fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.

THE AIR CONDITIONING WORKS GREAT (FAST AIR SPEED AND COLD AIR!) FOR ABOUT A HALF HOUR, THEN IT APPEARS THAT IT INSTANTLY (5 SECONDS FOR THIS CHANGE) GETS MUCH LESS COOL, AND THE AIR SPEED IS MUCH SLOWER.
BOTH OF THESE EVENTS HAPPEN AT THE SAME TIME.
TURNING THE DIAL FROM FLOOR, TO VENT, TO WINDSHIELD (ALL THREE PLACES) DOES NOT CHANGE THIS PROBLEM.
I NOTICED YESTERDAY, (SUBWAY SANDWICH STOP, 10 MINUTES) THAT WHEN THE TRUCK IS TURNED OFF AND BACK ON, THE PROBLEM CLEARS FOR A PERIOD OF TIME.

Suspect evaporator is icing over possible faulty cycling switch. Rear unit work ?

ACTUALLY, LAST SUMMER I HAD THE REAR UNIT'S PIPE CUT AND CAPPED. THERE WAS A DIFFICULT-TO-FIX ($$$) LEAK LEADING TO THE BACK UNIT. ONLY THE FRONT UNIT IS IN SERVICE, NOW. THIS IS AN ENVOY XL.

When operate my air condition I can not get air to blow from the vent in the dash. The aircondition will only blow at the vent in the floor.

The air vents are operated by vacuum. Check to see if there is a vacuum leak under the dash and at the engine where the vacuum is supplied.

My a/c blows cool air until the compressor cuts off for sometime 3- 15 min at a time,what could be the problem??

Most likely you have a low refrigerant charge. This will cause the low pressure switch to activate and cut the A/C compressor out. Check the refrigerant by purchasing a 12 oz can with a guage attached. It should read approx. 40 psi +/- 5 psi. If adding refrigerant does not help then you can change out the low pressure cutoff switch.

hi there,if the motor is running and the airco is off the airco comes on anyway for 30 sec turns off for 30 sec and on again and that keeps on going till you turn off the ventilation motor then it stops untill you turn on the vent. and the airco go's on again
any suggestions?

thx wil

Hi
Automatic or manual controled HVAC?

Thanks but we repaired it without you on the same day. (Sunday March 21). The intake manifold hose clamp was loose, they fastened it, problem solved!!
So ia there a change to get our money back???

Thank you for using 2CarPros.com. We appreciate your donation and look forward to helping you in the future.

I asked you a question about airconditioning GMC 2002 I donated $20,- butt didn't get a answer and later on i fixed it my self.
I dont know if $20 is enough butt i didnt get an answer the same day,and i still dont have an answer yet.
maybe you can return my money? thx wil

We have refunded your donation and hope we can help you next time. We are glad you were able to locate the problem and fix it. Have a great day.

Engine Performance problem
2002 GMC Envoy 6 cyl Two Wheel Drive Automatic 112K miles
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I'll try and make this short..
battery died (6 years old), replaced battery, had altenator and new battery tested, both tested good.
Since new battery was installed I am unable to use the climate control (heat or air). As soon as the fan kicks on power drops, lights dim, idle drops to 0 and car dies. If I happen to be driving at say 45mph and attempt the system there is a temp. but major drop in power and rpm's and then surges as the car attemps to compensate. Trouble code thrown was cam shaft sensor, so I put in a new one to no avail.
There was absolutly no troubles until the battery issue, may be a coinsenidence but rather odd timing

Hello folks, Found the problem so figured I'd post so it may help others (sorry, but I don't have any $$ to offer)
Oddly enough the trouble is not directly related to the hvac system, but instead is an issue with the gas pedal. The gas pedal is electronically controlled and there is a control box located under the air filter (easily accessed). Seems this device had become gummed up and was unable to do it's job in regards to delivering the correct power and information under draw. Here's the catch...once the thing has reached this point it can damage the mechanics inside resulting in the electronics sending the wrong info even after being cleaned and lubricated and needs to be replaced. They run about $225 and it will take you about 30 ~ 45 minutes (if you are mechanically inclined!)
These kinds of things can really throw you because they send strange trouble codes, which btw clear themselves once cleaned, about your cam position and map sensors.
Hope this helps someone out there. It took me almost 5 days (on my own) to work this one out as seemed no one had any ideas other than to tell me my car was haunted...not what you want to hear, but typical response from a male mechanic to a female who works on cars!

A/C makes my car turn off when im at a stop light, it dose well when the car is on the road ??

Any applicable codes? So, you have an idle issue? Where applicable, clean the throttle-body and idle air control. I haven't looked to see if you have electronic throttle control.

ac is working on passengers side blows nothing but heat on drivers side suggestions on how to repair?

Hello,

This is common when the blend door actuator goes out this guide will help walk you through the replacement steps with instruction in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (Below). Please let us know what you find.