AC does not blow much air on High

[Harmon]

When I turn my AC to the high setting it seems that there should be more air coming out.  I have a 1986 c10 chevy and I bake on a 40 minute ride home because not very much cold air comes out of the vents.

[Lt.Del]

is an '86 air plenum controlled by vacuum or by cables?  If vacuum, I'd look there.  Perhaps vacuum reservoir or line isn't holding.  If cable, perhaps some binding issues under dash.  Blower motor going bad?

[Blazin]

Not quite understanding what the problem is. You say " it seems that there should be more air coming out. "
Then you say " because not very much cold air comes out of the vents. "
Is it the amount, or the temp. of air that you have a problem with?

[Irish_Alley]

can you feel a difference when you change speed of the blower motor

[Harmon]

There is a difference when you change from low to high as far as speed.  The air does blow cold as well.

The problem is it feels like more air should be blowing out of the vents.

My Dad who has a 77 Gmc pick up said, "It doesnt feel like there is much air blowing out of the vents."  ===It was on Hi.

The air coming out is cold, but it feels like more should come out on Hi....

[Dr_Snooz]

I'd be looking for leaves blocking the air intake.

[Edahall]

There is a difference when you change from low to high as far as speed.  The air does blow cold as well.

The problem is it feels like more air should be blowing out of the vents.

My Dad who has a 77 Gmc pick up said, "It doesnt feel like there is much air blowing out of the vents."  ===It was on Hi.

The air coming out is cold, but it feels like more should come out on Hi....

Both my 82 and 90 Suburban are similar to what you describe.  The fan just does not blow that much air.  I'm not too surprised because Chevy has always been known for finding ways to save pennies.  I wonder if there is an aftermarket fan that puts out a lot more output.  Or possibly, maybe the electrical wire to the fan is undersized.

[Irish_Alley]

Check all the duck work for holes

[1979C20]

If its the fan, replace it with a late model blower motor for even more flow.

[Edahall]

If its the fan, replace it with a late model blower motor for even more flow.

Good information here.  Do you know how new of a blower motor to use?  Could I use a blower motor out of a 2000 Chevy truck?  I ask because the blower motor from my 1990 Suburban is just as weak as my 1982 Suburban

[trevor73402]

Have you checked to see if any of your air is coming out under the dash on the floor? My A/C in my '84 blows cold, but when on "Hi', most of the air is actually coming out the floor vent. Ive never got a straight answer from anyone as to why its like this. Some people say check the blend door, some people say check the cables, some people just dont know, but its sucks!! I'd spend some decent $coin$ to have a good A/C in this truck.

***Id also like to know how late of a model blower motor we can use to maybe increase the air flow.

[1979C20]

If its the fan, replace it with a late model blower motor for even more flow.

Good information here.  Do you know how new of a blower motor to use?  Could I use a blower motor out of a 2000 Chevy truck?  I ask because the blower motor from my 1990 Suburban is just as weak as my 1982 Suburban

I personally do not know. But a few other forum members have mentioned it and done it. Theyll probably fill us in when they see this post.

[Harmon]

Good info....thanks yall.

I have alot of air coming out on the floor vent as well.

It seems that even though it blows cold, I cannot cool my truck off enough in the texas sun to make driving the vehicle comfortable.

[Edahall]

Good info....thanks yall.

I have alot of air coming out on the floor vent as well.

It seems that even though it blows cold, I cannot cool my truck off enough in the texas sun to make driving the vehicle comfortable.

Sounds like you might need to add some more refrigerant.  I refilled the A/C on my Suburban and it'll freeze you out of the vehicle even with the Texas heat.

[Blazin]

You shouldn't just add gas to the system. Each system is designed to take a certain weight of gas. To much it may blow cold, or it may not. But it will shorten the life of the components involved.