A/C vent barely blowing out air

FUNHAYDEN

MEMBER
1997 CHEVROLET CHEYENNE
6 CYL
2WD
AUTOMATIC
278,000 MILES

The A/C works and blows great in town, but when I take it on the highway, after about fifteen minutes there is barely anything blowing out of the vents even on high. It does not matter what setting it just barely blows anything out. What does barely come out of the vents is cold but it is not enough especially on a hot day. Can you tell me what is wrong and what I can do to fix it? Thank you.

Thursday, April 19th, 2018 AT 11:50 AM

5 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good afternoon.

Could be a couple of things.

1. AC system freezing up. If the pressures are not correct, the evaporator will ice up blocking the flow of air. You need a set of gauges to check this and see. Check to see if it is expelling water from the system.

2. HVAC air filter becoming clogged with moisture. When was the last time you had the filter changed?

Roy

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Thursday, April 19th, 2018 AT 12:43 PM

FUNHAYDEN

MEMBER
3 POSTS

Thank you for your response. I will start by checking the HVAC filter. I bought this truck recently so I do not know when the last time it was changed.

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Thursday, April 19th, 2018 AT 12:49 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

Okay, just looking on Alldata and it may or may not have a filter. It shows if you have it to be behind the glove box. There will be a cover with two screws you remove and just pull it out.

Roy

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Thursday, April 19th, 2018 AT 12:57 PM

FUNHAYDEN