I have a 2000 chevy blazer, the heater blows cold ...

i have a 2000 chevy blazer, the heater blows cold then hot, the a/c blows hot then cold what is the problem.


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How long does it take the heater to start blowing hot air? If it's a cold start it could take a few minutes until the engine heats up and the heater starts working, and it's perfectly normal.

And how long does it take the A/C to start working efficiently?


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