A/C Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*randy500* · 04-20-2020, 12:59 AM

Thats a ball valve that is auxiliary to the factory water valve down stream in your picture.
The factory one probably is leaking.
Ac delco 15-51293 is what you need to replace yours. The valve closes when ac is in recirc mode.

**Already Gone** · 04-20-2020, 01:51 AM

Quote:

Originally Posted by randy500

Thats a ball valve that is auxiliary to the factory water valve down stream in your picture.
The factory one probably is leaking.
Ac delco 15-51293 is what you need to replace yours. The valve closes when ac is in recirc mode.

So if I replace the water valve can I do away with the ball valve thing ?

*randy500* · 04-20-2020, 02:04 AM

Quote:

Originally Posted by Already Gone

So if I replace the water valve can I do away with the ball valve thing ?

Yes, someone added the ball valve to ensure full shutoff. Just take it off.

**Already Gone** · 04-20-2020, 02:10 AM

Quote:

Originally Posted by randy500

Yes, someone added the ball valve to ensure full shutoff. Just take it off.

Thank you.. RockAuto has the AC Delco one you mentioned. I will get it ordered up this week along with some other items I've been wanting to get.

kaycee · 04-20-2020, 08:38 AM

Yeah hes right I put one in mine and close it during summer it knocks the heat down going to cab.

Andy4639 · 04-20-2020, 09:06 AM

If you are wanting a 100% AC to work good then I would leave it. That ensures the hot water doesn't come into the cab while the AC is on. Most people put it in the other line though. If the vacuum operated valve leaks hot water by then your AC will never get as cold as it should inside the cab. Putting it in the other line makes sure it doesn't circulate at all through the heater core.
If you do decide to take it out a simple test is to feel the lower part of the interior heater box to see if it is warm when the AC is on and the truck is sitting still. If it is some what warm then you have water leaking by the vacuum valve and you will not get the cab as cool as it could be.

Davidf · 04-20-2020, 05:29 PM

Quote:

Originally Posted by Andy4639

If you are wanting a 100% AC to work good then I would leave it. That ensures the hot water doesn't come into the cab while the AC is on. Most people put it in the other line though. If the vacuum operated valve leaks hot water by then your AC will never get as cold as it should inside the cab. Putting it in the other line makes sure it doesn't circulate at all through the heater core.
If you do decide to take it out a simple test is to feel the lower part of the interior heater box to see if it is warm when the AC is on and the truck is sitting still. If it is some what warm then you have water leaking by the vacuum valve and you will not get the cab as cool as it could be.

Or to test: when the heat is off, the hose on one side (downstream side) of the factory valve should be cool.

04-20-2020, 12:59 AM	#1
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: A/C Question Thats a ball valve that is auxiliary to the factory water valve down stream in your picture. The factory one probably is leaking. Ac delco 15-51293 is what you need to replace yours. The valve closes when ac is in recirc mode.

04-20-2020, 08:38 AM	#5
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,464	Re: A/C Question Yeah hes right I put one in mine and close it during summer it knocks the heat down going to cab. __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60

04-20-2020, 09:06 AM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: A/C Question If you are wanting a 100% AC to work good then I would leave it. That ensures the hot water doesn't come into the cab while the AC is on. Most people put it in the other line though. If the vacuum operated valve leaks hot water by then your AC will never get as cold as it should inside the cab. Putting it in the other line makes sure it doesn't circulate at all through the heater core. If you do decide to take it out a simple test is to feel the lower part of the interior heater box to see if it is warm when the AC is on and the truck is sitting still. If it is some what warm then you have water leaking by the vacuum valve and you will not get the cab as cool as it could be. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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