a/c question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

camarossrulz · 06-01-2011, 07:12 PM

my a/c doesnt blow very hard. I have a new blower motor in it. It wont keep you cool. You can feel cool air coming out but not very hard when its on hi. anyone have any ideas on how to speed it up a little?

ChevLoRay · 06-01-2011, 07:18 PM

Probably not a speed issue, unless it won't run on high speed. There's a relay for the top speed. Yours may be bad. If so, it's not unusual.

If it runs on high speed, you may have an issue with the cables that operate the door, or a leaking plenum (the S-shaped piece). The doors that bring in outside air may not be sealing off. There's a piece of linkage on the passenger side of the firewall, right at the top of the firewall. You should check it, too. The valve that controls the hot water to the heater, may not be closing off. If it is an OEM type, there may be a problem with the vacuum that controls it, or the AC controller, OR you may just want to replace it with a manual valve that you can shut off. Heated water in the cab will give your cooled air a big obstacle to overcome.

Lee H · 06-01-2011, 07:18 PM

Is the motor speeding up with each click of the switch?
Posted via Mobile Device

camarossrulz · 06-01-2011, 08:48 PM

the fan does change speed on every setting. i did notice that it blows a little bit out every outlet (floor, defroster, a/c vents). I know there is a problem there with the box but i would think it should still cool the cab. I will check those things. I dont know much about these systems though. It is a factory system, most of the parts in it are new.

**leddzepp** · 06-01-2011, 09:08 PM

The recirculating vent door (on the passenger kick panel, inside the cab) should be open when the A/C is on. If it is closed, that will rob your air volume big time. As Chevloray pointed out, the fresh air door (pass side cowl, under the hood) should be closed.

camarossrulz · 06-02-2011, 05:49 PM

ok, the door on the passenger kick panel is working. it doesnt look like the parts on the passenger cowl under the hood doesnt seem to be working. I tried everything and that linkeage that goes through the firewall never moves. could that be my problem maybe?

06-01-2011, 07:12 PM	#1
camarossrulz Registered User Join Date: Sep 2007 Location: south shore KY Posts: 43	a/c question my a/c doesnt blow very hard. I have a new blower motor in it. It wont keep you cool. You can feel cool air coming out but not very hard when its on hi. anyone have any ideas on how to speed it up a little? __________________ 1972 C-10 short bed, 2wd, 350(ls1 coming soon) 1969 camaro ss, 496 stoker, 4sp 2009 crew cab,duramax 2500hd 4x4, lifted (sold) 2008 Daytona Charger, Hemi Orange, 07 C6 Z06 2005 suburban, 2002 grand prix gt 2005 grizzly, 2004 R1

06-01-2011, 07:18 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: a/c question Probably not a speed issue, unless it won't run on high speed. There's a relay for the top speed. Yours may be bad. If so, it's not unusual. If it runs on high speed, you may have an issue with the cables that operate the door, or a leaking plenum (the S-shaped piece). The doors that bring in outside air may not be sealing off. There's a piece of linkage on the passenger side of the firewall, right at the top of the firewall. You should check it, too. The valve that controls the hot water to the heater, may not be closing off. If it is an OEM type, there may be a problem with the vacuum that controls it, or the AC controller, OR you may just want to replace it with a manual valve that you can shut off. Heated water in the cab will give your cooled air a big obstacle to overcome. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

06-01-2011, 07:18 PM	#3
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,141	Re: a/c question Is the motor speeding up with each click of the switch? Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

06-01-2011, 08:48 PM	#4
camarossrulz Registered User Join Date: Sep 2007 Location: south shore KY Posts: 43	Re: a/c question the fan does change speed on every setting. i did notice that it blows a little bit out every outlet (floor, defroster, a/c vents). I know there is a problem there with the box but i would think it should still cool the cab. I will check those things. I dont know much about these systems though. It is a factory system, most of the parts in it are new. __________________ 1972 C-10 short bed, 2wd, 350(ls1 coming soon) 1969 camaro ss, 496 stoker, 4sp 2009 crew cab,duramax 2500hd 4x4, lifted (sold) 2008 Daytona Charger, Hemi Orange, 07 C6 Z06 2005 suburban, 2002 grand prix gt 2005 grizzly, 2004 R1

06-01-2011, 09:08 PM	#5
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,996	Re: a/c question The recirculating vent door (on the passenger kick panel, inside the cab) should be open when the A/C is on. If it is closed, that will rob your air volume big time. As Chevloray pointed out, the fresh air door (pass side cowl, under the hood) should be closed. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

06-02-2011, 05:49 PM	#6
camarossrulz Registered User Join Date: Sep 2007 Location: south shore KY Posts: 43	Re: a/c question ok, the door on the passenger kick panel is working. it doesnt look like the parts on the passenger cowl under the hood doesnt seem to be working. I tried everything and that linkeage that goes through the firewall never moves. could that be my problem maybe? __________________ 1972 C-10 short bed, 2wd, 350(ls1 coming soon) 1969 camaro ss, 496 stoker, 4sp 2009 crew cab,duramax 2500hd 4x4, lifted (sold) 2008 Daytona Charger, Hemi Orange, 07 C6 Z06 2005 suburban, 2002 grand prix gt 2005 grizzly, 2004 R1



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