A/C condensation leaks under the dash - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rogue_Alphonse · 08-15-2011, 08:21 PM

in the same spot my heater core leaked the beginning of the year.

So obviously I looped the coolant line for the time being, and am going to replace the heater core soon.

I took off the cover under the dash to figure out why my fan was whistling, ended up a metal door had opened too far and the vacuum thing that controls it had broken off. Fixed that.

After about 2 months of working A/C, it started dripping in the cab.

Before I get into this heater core replacement, which will involve figuring out why the A/C condensation leaks in the cab as well, anyone have any ideas that could be the issue?

It's the type that you have to remove the inner passenger wheel well to get to the bolts to remove all that bulljive under the dash JUST to get to the heater core. Is there a condensation line I don't know of?

motornut · 08-15-2011, 09:18 PM

should be a hole under the housing in the engine area

Rogue_Alphonse · 08-15-2011, 10:01 PM

Could it be clogged though? as in could a damn mouse get in there? I know I found one in my windshield washer fluid reservoir...

*78 Chevyrado* · 08-15-2011, 10:21 PM

Check on the AC box mounted to the outside of the firewall, for the hole it's like a 1/4" hole, its near the seam where the two halves come together around the eveporator and back near the firewall. If it's clogged up you will get drips in the cab. Use a mirror and a flashlight and its pretty easy to see, unless its covered up with something.

Rogue_Alphonse · 08-15-2011, 10:27 PM

I'll take a look at it tomorrow, thanks a bunch!

motornut · 08-15-2011, 10:47 PM

lol think i've seen pics of Camel spiders in there.....mouses will fit
might feel the bump down to the lowest point

08-15-2011, 08:21 PM	#1
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	A/C condensation leaks under the dash in the same spot my heater core leaked the beginning of the year. So obviously I looped the coolant line for the time being, and am going to replace the heater core soon. I took off the cover under the dash to figure out why my fan was whistling, ended up a metal door had opened too far and the vacuum thing that controls it had broken off. Fixed that. After about 2 months of working A/C, it started dripping in the cab. Before I get into this heater core replacement, which will involve figuring out why the A/C condensation leaks in the cab as well, anyone have any ideas that could be the issue? It's the type that you have to remove the inner passenger wheel well to get to the bolts to remove all that bulljive under the dash JUST to get to the heater core. Is there a condensation line I don't know of? __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!

08-15-2011, 09:18 PM	#2
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: A/C condensation leaks under the dash should be a hole under the housing in the engine area __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

08-15-2011, 10:01 PM	#3
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	Re: A/C condensation leaks under the dash Could it be clogged though? as in could a damn mouse get in there? I know I found one in my windshield washer fluid reservoir... __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!

08-15-2011, 10:21 PM	#4
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: A/C condensation leaks under the dash Check on the AC box mounted to the outside of the firewall, for the hole it's like a 1/4" hole, its near the seam where the two halves come together around the eveporator and back near the firewall. If it's clogged up you will get drips in the cab. Use a mirror and a flashlight and its pretty easy to see, unless its covered up with something.

08-15-2011, 10:27 PM	#5
Rogue_Alphonse Registered User Join Date: Dec 2009 Location: Gap PA Posts: 280	Re: A/C condensation leaks under the dash I'll take a look at it tomorrow, thanks a bunch! __________________ 1991 Mustang GT Vert, T-5 w/ Pro 5.0, Trick Flow upper & lower, BBK cold air intake, 3:73, BAMA chip, etc. 1988 K5 Blazer, [coming soon] TBI 400, SM465/NP208, 12 bolt rear, 3:08's, looks like a 1980. 1998 Jeep Grand Cherokee 4.0 fully loaded daily driver! Where there's a will, there's a rig!

08-15-2011, 10:47 PM	#6
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: A/C condensation leaks under the dash lol think i've seen pics of Camel spiders in there.....mouses will fit might feel the bump down to the lowest point __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350



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