Vacuum Heater Valve
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Senior User
Joined: Sep 2011
Posts: 203
Likes: 1
From: Delaware
Install one. I would like to add it so vacuum controls it. When I call for heat the valve opens with out manualy working a ball valve.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
The vacuum valve is to make the AC colder by stopping the flow of hot coolant through the heater core. For the heater, you don't need to do anything.
The Excursion valve doesn't open, it closes off flow. That would leave you with no heat.
The Excursion valve doesn't open, it closes off flow. That would leave you with no heat.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
Likes: 1,335
From: Elk Grove, CA
Remove or drop the glove box and the vacuum lines are right there. Here is a link with all the details, then some. I chose to bypass the heater only on Max AC so I could still blend the temps in normal AC mode.
Cold AC Mod
Cold AC Mod
Postmaster
Joined: Jun 2010
Posts: 2,555
Likes: 9
From: Longview, TX
Remove or drop the glove box and the vacuum lines are right there. Here is a link with all the details, then some. I chose to bypass the heater only on Max AC so I could still blend the temps in normal AC mode.
Cold AC Mod
Cold AC Mod
I don't mean to hijack this thread, but I was reading through the link posted, and have to say that I have never experienced the air not blowing cold in the summer. My dad's truck and my last truck both blew as cold as any truck i've had. Won't know on this one until the hot weather gets back.
Is this something that was fixed in the later trucks (02-03), or am I just not understanding the issue? I always run max AC for cold, and feet/defrost for heat. Max AC usually has to run about 8-9 oclock position to be comfortable.
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More Turbo
Joined: Aug 2005
Posts: 683
Likes: 6
From: North Georgia
I will try to shed some light on the subject. If you have a pickup truck from 2000-03 then more than likely you do not have a valve in line to cut off the flow of hot water to the heater core. Excursions did have the valve and you could use one on your truck if you like. All there is to do is tap into the existing heater hose lines and install the vacuum to the white vacuum hose that is just behind the glove box. There is also a ford ranger valve that auto zone sells to do this job as well. Hope this helps.
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Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
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From: Western AR
My water pump thread has a couple of photos of the valve installed. It goes in the line that goes to the top of the water pump. As someone else already mentioned, the vacuum line runs over past the condensor and into the firewall. Once inside the truck, it goes to to a T fitting under the glove box.
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