AC Drain ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Restrorob · 05-24-2010, 12:13 PM

One of the guy's here at work has a 89 C2500 and asked me where the AC evaporator box drain is, He said he's looked all over for one but can't find it. I haven't a clue and not going to craw around under it looking.

Any of you folks know where they hid it ?

Thanks

ChevLoRay · 05-24-2010, 12:16 PM

I saved this pic of an underdash layout for HVAC. See if it helps.

clinebarger · 05-24-2010, 01:07 PM

Here you go. Is water getting in the cab? If so heres a TSB on how to fix it.

Owners of some 1988-1992 C/K vehicles may comment that water leaks from the A/C evaporator drain into the passenger compartment. This condition can be encountered during A/C operation especially on days with high humidity. Under normal operation, water gathers on the bottom of the evaporator case and drains out into the engine compartment. However, in some instances, air flowing through the engine compartment can blow the water back toward the opening in the cowl for the evaporator drain. This action may allow the water to seep down into the passenger compartment. In order to repair this condition, a drain tube (P/N 22542866) should be installed on the end of the evaporator drain. This will allow the water to drain down away from the evaporator drain opening.

ChevLoRay · 05-24-2010, 01:35 PM

Thanks for the schematic. I saw that the pic I had didn't show it but thought it might be of some good for someone who needed it, just in case it helped them see what doesn't necessarily show.

TennesseeZ · 05-24-2010, 02:22 PM

Here's a pic IndyAnne posted of hers:

Restrorob · 05-24-2010, 06:09 PM

Quote:

Originally Posted by clinebarger

Is water getting in the cab?

Yep, That's what is happening.

Thanks everyone, This place

!!!!

ChevLoRay · 05-24-2010, 11:27 PM

Any questions?

Desy180 · 11-22-2017, 08:08 AM

Thanks for the info. Good review!

05-24-2010, 12:13 PM	#1
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	AC Drain ? One of the guy's here at work has a 89 C2500 and asked me where the AC evaporator box drain is, He said he's looked all over for one but can't find it. I haven't a clue and not going to craw around under it looking. Any of you folks know where they hid it ? Thanks __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

05-24-2010, 12:16 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: AC Drain ? I saved this pic of an underdash layout for HVAC. See if it helps. Attached Images __________________ 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.

05-24-2010, 01:07 PM	#3
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: AC Drain ? Here you go. Is water getting in the cab? If so heres a TSB on how to fix it. Owners of some 1988-1992 C/K vehicles may comment that water leaks from the A/C evaporator drain into the passenger compartment. This condition can be encountered during A/C operation especially on days with high humidity. Under normal operation, water gathers on the bottom of the evaporator case and drains out into the engine compartment. However, in some instances, air flowing through the engine compartment can blow the water back toward the opening in the cowl for the evaporator drain. This action may allow the water to seep down into the passenger compartment. In order to repair this condition, a drain tube (P/N 22542866) should be installed on the end of the evaporator drain. This will allow the water to drain down away from the evaporator drain opening. Attached Images

05-24-2010, 01:35 PM	#4
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: AC Drain ? Thanks for the schematic. I saw that the pic I had didn't show it but thought it might be of some good for someone who needed it, just in case it helped them see what doesn't necessarily show. __________________ 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.

05-24-2010, 02:22 PM	#5
TennesseeZ Countdown Survivor Join Date: Aug 2007 Location: Bean Station, East Tennessee Posts: 9,676	Re: AC Drain ? Here's a pic IndyAnne posted of hers: __________________ 93 Yukon 89 Silverado Z71 SWB Sport 91 K 2500 Silverado "Lobuk-Worktruk" A MAN OF HONOR DOES NOT LIE, CHEAT, OR STEAL, NOR TOLERATE THOSE WHO DO. Gettin' old ain't for sissies. Last edited by TennesseeZ; 05-24-2010 at 02:26 PM.

05-24-2010, 11:27 PM	#7
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: AC Drain ? Any questions? __________________ 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.

11-22-2017, 08:08 AM	#8
Desy180 Registered User Join Date: Nov 2017 Location: Europe Posts: 11	Re: AC Drain ? Thanks for the info. Good review!



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