Weird AC issue. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldCreek · 07-09-2019, 11:39 PM

Well I took off my lower actuator and fixed the same problem as the OP.

Once you pull off the actuator you can turn the blend door open/closed by hand to confirm the air flow changes. Once I turned it by hand I was able to get cold air to the driver side.

My actuator was stuck...water got into the case and rusted the motor.

Now I have to find out where the water came from..... outside leak or condensation from the a/c system. It wasn't antifreeze from the heater core.

Thanks for posting your answers/experience!

WyattTX · 07-10-2019, 01:49 PM

Quote:

Originally Posted by OldCreek

Well I took off my lower actuator and fixed the same problem as the OP.

Once you pull off the actuator you can turn the blend door open/closed by hand to confirm the air flow changes. Once I turned it by hand I was able to get cold air to the driver side.

My actuator was stuck...water got into the case and rusted the motor.

Now I have to find out where the water came from..... outside leak or condensation from the a/c system. It wasn't antifreeze from the heater core.

Thanks for posting your answers/experience!

It could be a leaking evaporator core. I will warn you now, these are not fun at all to change out.

mountie · 07-10-2019, 02:46 PM

Quote:

Originally Posted by WyattTX

It could be a leaking evaporator core. I will warn you now, these are not fun at all to change out.

Full agreement.....

Anything to fix under a dash is never fun..... Unless the front seats remove easily. Which they don't.

**hatzie** · 07-21-2019, 09:44 AM

Quote:

Originally Posted by mountie

Full agreement.....

Anything to fix under a dash is never fun..... Unless the front seats remove easily. Which they don't.

The seats come right out with the correct tool.
The nuts are E-Torx or External Torx. There's not a lot of clearance round the nuts so you'll want a decent quality socket set not the cheapies with thick socket walls.

The dash is an absolute SOB to deal with.

OldCreek · 07-10-2019, 04:44 PM

Quote:

Originally Posted by WyattTX

It could be a leaking evaporator core. I will warn you now, these are not fun at all to change out.

Thanks for the tip.

I looked up leaking evap core and it sounds like it should be gas vapor only. But, a clogged drain channel will lead to water in the footwell.

Anyone know if/where a drain tube would be?

07-09-2019, 11:39 PM	#1
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: Weird AC issue. Well I took off my lower actuator and fixed the same problem as the OP. Once you pull off the actuator you can turn the blend door open/closed by hand to confirm the air flow changes. Once I turned it by hand I was able to get cold air to the driver side. My actuator was stuck...water got into the case and rusted the motor. Now I have to find out where the water came from..... outside leak or condensation from the a/c system. It wasn't antifreeze from the heater core. Thanks for posting your answers/experience! __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263



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