Question about 2000 GMC Yukon Denali

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Air conditioner does not cool in 2000 Yukon.How do I check freon level and how to replace freon if need be

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  • Expert
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You will need the proper equipment to check the operating pressure of the a/c system while the system is running.
However if you are certain it is low on freon, any auto parts store will sell 1lbs cans of 134a freon and supply hoses with the low side pressure guage for adding freon only.
Add freon using the directions on the back of the can

Posted on Aug 19, 2010

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Get an r134a refrigerant add kit from Walmart or your local auto parts store.

You can even get a can of Arctic Freeze by Intermatics that has a hose and a gauge on it.

Connect the hose to the low side port. You can find this port on the 'thicker' piping that comes off of the compressor (versus the thinner piping that comes off the compressor which is the high pressure side).

Pressure should read 25 psi to 45 psi on the low pressure side when the compressor is running and the a/c is on.

Pressure should read 75 psi to 100 psi on a hot day when the car is off.

However, you'll want the a/c to be running when you add freon.

Press the button on the can to install more freon, if needed.

Posted on Aug 19, 2010

  • Duane Wong
    Duane Wong Aug 19, 2010

    Also, make sure that the fan goes on the radiator when you turn the a/c on and the car is running. This sometimes will cause less efficient a/c performance and overheating if the a/c is on but the fan doesn't turn on (if you have an electric fan). If you have a belt driven fan then you don't have to worry about this.

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2000 GMC Yukon air conditioner how to replace and what do I need to do


How have you deemed that it is a faulty "air conditioner", and not an AC system that is just low or depleted of Freon and needs recharged? If it is truly a bad AC motor/pump, we are talking about recovering the Freon from the system, which is complicated and requires training in its own, and then replacing the physical part, and then recharging the system accurately and properly.
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sounds like you may need some freon in the ac system then it should blow cool air again . you can go to a shop and get it checked to see if its low on freon.

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First of all get the Freon level checked, if Freon/ refrigerant is low then it can cause this problem.Wen Freon is low it takes time to cool.--- So first get Ac pressure tested.It can be tested at any local car garage.Some times pressure will be checked OK, but still if Freon is getting clogged in the line/ tube then it will not reach the front , but reaches rear then front will not cool, but rear will.--------

But mostly this problem is related to blend door.

If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.

Either a bad blend door motor or Climate Control Assembly. The A/C heater function selector switch combines a vacuum selector valve for direct control of the vacuum control motors and electrical input to the instrument cluster module.

------------

The blend door actuator is located behind the glove box.-----

To see blend door diagram for your Yukon Denail, click the link below :---

http://howtobyme.blogspot.com/2011/08/where-is-blend-door-actuator-located-on.html

------------

This will help.Thanks.Helpmech.

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The compressor on the air conditioner in my 2000 GMC Yukon XL went out last summer. Had it and the whole line replaced at a local air conditioning shop last fall. Used it little before cold weather. Warm weather this spring and no cold air. We could hear the compressor trying to kick in. The shop told us that the control console was bad and had to be replaced. They told us the part was on back order and did not know if they would be abel to get one any time soon. We took the Yukon into the local GM dealership. They told us that the high side fitting was bad and that the freon was very low and that they would have to deal with that first to check the system. Called back to the air conditioning shop and they said they had a console come in and they would put it in and check the high side fitting. I now have cold air and questions. Bought Yukon in 2005 used, had always had problem of not switching to cold air once the heater has been used. We were told changing the console should fix that. It has not changed. I feel like the console angle was a scam, that the system was just low on freon. Each shop was blaming the other for trying to scam me. And what can fix the heat to cold issue? If anyone has answers I would sure appreciate the knowledge.

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