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When my climate controls are left on the hot side for the first half of the day but I now need the a/c for the other half of the day, so I turn the climate control all the way over to cold then I turn on the a/c but it never gets cold. It just keeps blowing hot air with the compressor on. I have to turn off the truck for 5 to 10mins start it back up, then it will start blowing cold air.
 

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Check your condenser in front of the radiator to see if it clogged up. If not, take it to get the a/c checked. You may have a plugged restrictive fitting.
 

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Your blend door actuator may be going. I had the opposite problem where I couldn't get it to go back to hot and that was my issue.
 

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Go to the auto parts place and get one of those DIY ac recharge kits. I did my truck and it works great.
 
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