99 Silverado A/C condensation drain - The 1947 - Present Chevrolet & GMC Truck Message Board Network

S10Fan · 04-04-2019, 10:34 AM

99 Silverado 1500, recently repaired/serviced the A/C, 40 degree vent air for a couple weeks. No condensation is draining from the firewall drain tube, no water on the interior floor (rubber mat). I bent a 1/8" piece of round bar and ran it up into the drain tube, no apparent blockage. I have to think some water would come out of the drain after each use.

How far up into the tube should I be trying to clean out? Should I remove the tube and try cleaning again?

I'd rather get ahead of this before I have 100 degree days and a wet floor.

Thanks in advance!

S10Fan · 04-11-2019, 05:53 AM

Update.....

I guess there hadn't been enough humidity in the air for much condensation to develop. The drain appears to be working normally with recent higher temperatures.

**Palf70Step** · 04-11-2019, 06:15 AM

Glad it seems to be working OK now. Had no clue since I no longer have any late model trucks to look at..

04-04-2019, 10:34 AM	#1
S10Fan Old Heap Driver Join Date: Mar 2008 Location: Newport News, Va Posts: 2,642	99 Silverado A/C condensation drain 99 Silverado 1500, recently repaired/serviced the A/C, 40 degree vent air for a couple weeks. No condensation is draining from the firewall drain tube, no water on the interior floor (rubber mat). I bent a 1/8" piece of round bar and ran it up into the drain tube, no apparent blockage. I have to think some water would come out of the drain after each use. How far up into the tube should I be trying to clean out? Should I remove the tube and try cleaning again? I'd rather get ahead of this before I have 100 degree days and a wet floor. Thanks in advance! __________________ _____________________________ Bryan '99 Silverado 1500, 4.3, 5-speed, reg cab, short bed '50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser. '40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.

04-11-2019, 05:53 AM	#2
S10Fan Old Heap Driver Join Date: Mar 2008 Location: Newport News, Va Posts: 2,642	Re: 99 Silverado A/C condensation drain Update..... I guess there hadn't been enough humidity in the air for much condensation to develop. The drain appears to be working normally with recent higher temperatures. __________________ _____________________________ Bryan '99 Silverado 1500, 4.3, 5-speed, reg cab, short bed '50 Chevy 2DR Hard Top, 350/350, M2 Front End, 3:08 gear, cruiser. '40 F**d Sedan, all Chevy power, Heidt's front end, TCI rear, nice driver.

04-11-2019, 06:15 AM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,249	Re: 99 Silverado A/C condensation drain Glad it seems to be working OK now. Had no clue since I no longer have any late model trucks to look at.. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!



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