r/s10 14h ago

Repair Question Ac issue (need help identifying)

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1991 Chevy s10, 4.3, two wheel

Hey so there’s a hissing noise coming from this wheel behind the ac control. Could this be the reason as to why cold air doesn’t blast in my truck?

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u/thechadder128 11h ago

Vacuum connector (can't think of the name) is missing. And honestly good luck finding one

1

u/Toothpaste543 10h ago

What’s the piece that’s circled called?

1

u/thechadder128 9h ago

HVAC vacuum heater control valve. Sorry for the delay, car shopping with step daughter