If you are having to add refrigerant, then this means you have a leak, and you will be adding refrigerant again in a few months. It is illegal to add refrigerant to a system with a leak without first repairing the leak. So, my advice is to take it to a professional and have the leak repaired and refrigerant added with the proper equipment, which you do not have.
An ECU is essentially the brain for a 1999 GMC Suburban. Without an ECU the truck will not be able to operate at all.
My 99 gmc suburban is stuck in 4 wheel drice low
According to the 07 Refrigerant Oil Specifications an 99 GMC Yukon uses either 36 or 64 oz of refrigerant depending if the vehicle has rear ac. You can find more helpfull information about your vehicle ac system at www.idqusa.com.
replace rear brake hydrolics
What do you want to know about its oul changes? When, how, the cost...?
If you are unsure use Ester oil. It is safe for all systems and chemicals.
it may have a cracked circuit board, my blazer had the same problem
Just changed mine today in a 99 GMC K2500 Suburban 4WD and it took 3 quarts
That year did not use a carburetor. Those models came fuel injected.
Turn off with the temp button, BUT HOLD FOR 5 SECONDS, it should change
134a refrigerant
how so you turn on the daytime running lights on a 99 suburban