I have had this truck for almost a year. Bought it with 125k miles. It now has approx 148k on it. Last summer in 100 degree plus heat and running AC the thermostat shoots way up when on the freeway beginning to pull a grade. Turning the heat to maximum temp and running fan on high gets the temperature gauge back down in about 3-5 minutes...A couple of months ago the AC stopped blowing cool air...2 weeks ago the Lube place flushed out my cooling system and replaced the Dexcool product (the Tech said there was regular coolant in it - Bad!). 2 days ago when driving home from work, the low coolant light came on (first time since I have had the truck). the next day I took it to the place that flushed my cooling system and they noticed that the rear crank pulley belt was broken (no overheating). Is that belt related to no cool air blowing in my AC?
Yes, Depending on where that belt runs in your setup.If it runs to your a/c compressor, it has to pull the compressor pulley to circulate the freon through your a/c system.If your a/c compressor is not pulling,you will get nothing but hot air.The a/c compressor is the heart of your a/c system.From the sound of it,replace that belt and it should be fine.Hope this helps.Have a good day.(p.s. you always want to keep dex-cool in your vehicle being that it is a GM vehicle after 2000)
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Re: 2000 GMC Sierra 4.8L V-6 - AC blows warm air
Never seen a truck like this ,iam in spain but from the sound of it one belt drives a/c and another the power steering and altenator ,pos water pump as well but this could be driven by the timing belt .As i said i have never seen one of these trucks .If i had it in front of me i could soon tell you .
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I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.
This could possibly be a block in your heater core or the thermostat may be going bad and not circulating the antifreeze the way it should once the engine has warmed up. Have you had your antifreeze system flushed? If its a 2000 then its 10 years old and the system should be flushed and refilled
Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.
you need the tempature blend door motor. My 01 silverado had this issue about 1 1/2 years before i was tired of messing with it they are not hard to replace. The cover (if it is still on) for passenger side floor ducts needs to be removed and the motor is near the right side of "hump" (trans tunnel) mounted horisontial with the armature pointing upwards.