AC/heater control mod
Thread Starter
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
AC/heater control mod
Okay, so a weird time of year to do this, but was simple and cheap. I spliced into the red vacuum line, and I don't have heat except heater position on down. I expected the left side of dial to be cool, but thought the heater/vent position would still be warm.?? Did I splice the wrong vacuum line? If I read correctly, the white line will do only the max ac position, and I was hoping for cooler vent and regular ac also.
Thanks.
Thanks.
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
I did the RED line on mine a few years back and everything on the LEFT side of the OFF position is COLD, and non-adjustible.
On the RIGHT side of OFF everything is WARM ans IS adjustible.
-Hope I've helped you...
On the RIGHT side of OFF everything is WARM ans IS adjustible.
-Hope I've helped you...
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
I have an electrically operated vacuum switch that I was going to use for that same purpose. I ended up scrapping that idea. If you make the gtg this weekend I can bring it, if you're interested. It could be tied into the a/c compressor control of the switch and use a full time vacuum source. That way it only closes the heater valve when the a/c is on.
Postmaster
Joined: Jun 2010
Posts: 2,555
Likes: 9
From: Longview, TX
I still haven't quite understood the need for this mod/fix. Every one of these trucks I've been in has colder air than any other (minus a Mazda protege I had in highschool that blew ice out the vent). Have I just had good luck, or am I missing something?
I understand how the lines are ran and how the door blends and all, but I can rarely run the temp **** all the way left as it is. Maybe I'm just acclimated to the heat lol
I understand how the lines are ran and how the door blends and all, but I can rarely run the temp **** all the way left as it is. Maybe I'm just acclimated to the heat lol
Thread Starter
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
Basically it is up to personal preference. All other vehicles I have seen have some sort of heater control valve in the engine comp, cutting off the flow of coolant. I like running vent a lot, and before the air felt warm when it was 65-70 outside. This is because the air is picking heat up from the heater core, because hot coolant is always in the core. Cut off the heat, core cools off, cooler vent temp., and that means colder ac also.
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Postmaster
Joined: Jun 2010
Posts: 2,555
Likes: 9
From: Longview, TX
So it's more for using vent control with the compressor off, there is more benefit. That makes since. I never take it off max or AC unless its on defrost, which all utilize the compressor. Since I don't use the coldest setting normally, I wouldn't see much benefit.
Thanks for explaining that Tom
Thanks for explaining that Tom
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