Question about 2000 GMC Yukon Denali
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
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
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Posted on Jan 02, 2017
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Mar 02, 2017 | GMC Cars & Trucks
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 :---
This will help.Thanks.Helpmech.
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