Heater control
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Freshman User
Joined: Sep 2012
Posts: 36
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From: Brampton
Heater control
I have not had any air blowing out of any other area that the defrost.When I select floor, HI, all blows from windshield defrost, similarly no matter what setting I select, only blows out defrost.
How can I troubleshoot this? Where to start? Control unit in dash? stuck vent flap? I have heard that the controls were a common problem... but I guess the question is how do I determine if that is the actual issue?
Much appreciated
How can I troubleshoot this? Where to start? Control unit in dash? stuck vent flap? I have heard that the controls were a common problem... but I guess the question is how do I determine if that is the actual issue?
Much appreciated
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Freshman User
Joined: Sep 2012
Posts: 36
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From: Brampton
That may make sense, does that have control of the automatic 4x4 at the hub? Right now the only way I get 4x4 on the fly is if my hubs are locked. I figured I had a faulty hub and haven't taken the time to check it out.
Senior User
Joined: Oct 2006
Posts: 210
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From: Welland, On
On the passenger fender there should be a PVH solenoid (Pulse Vacuum Hub Solenoid). You might want to disconnect this from the vacuum system and plug the line. The idea is to try and eliminate the ESOF vacuum system from the rest of the vacuum that runs the heater system. If the air blows out from other areas, you know where your problem is. Because 4x4 only works with hubs locked, sounds like your vacuum leak is in the ESOF vacuum system and not with the heater system. If you are not interested in fixing the ESOF system at this time, leave it isolated from the vacuum system (plug open lines to prevent dirt entry) and continue to run your automatic 4x4 with the hubs locked.
Last edited by iron1951; Jan 19, 2013 at 07:53 AM. Reason: spelling error on a key word
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
I have one of these
Mityvac/Silverline elite vacuum pump test kit (MITMV8500) | Vacuum Pump Brake Bleed Kit | AutoZone.com
It is very handy for doing testing on vacuum systems and for bleeding the brakes.
Here is a cheeper one
OEM/Liquid siphoning vacuum pump kit (25136) | Vacuum Pump Brake Bleed Kit | AutoZone.com
Let us know if you need help and how you fixed it.
Sean
NOTE: PM me if you want the 06 copy of the vacuum schematics.
Mityvac/Silverline elite vacuum pump test kit (MITMV8500) | Vacuum Pump Brake Bleed Kit | AutoZone.com
It is very handy for doing testing on vacuum systems and for bleeding the brakes.
Here is a cheeper one
OEM/Liquid siphoning vacuum pump kit (25136) | Vacuum Pump Brake Bleed Kit | AutoZone.com
Let us know if you need help and how you fixed it.
Sean
NOTE: PM me if you want the 06 copy of the vacuum schematics.
Last edited by Yahiko; Jan 19, 2013 at 03:07 AM. Reason: Note :
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Freshman User
Joined: Sep 2012
Posts: 36
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From: Brampton
Well I have heat control now. thanks a lot guys turns out it wasn't a vacuum leak.
I just looked at the pump and the connection, I squeezed a little bit tighter and sure enough the pump fired right up and now I have controls.
Should this pump be running all the time?
If not maybe I do still have a vacuum leak somewhere but for now at least My wife can have warm feet!
I just looked at the pump and the connection, I squeezed a little bit tighter and sure enough the pump fired right up and now I have controls.
Should this pump be running all the time?
If not maybe I do still have a vacuum leak somewhere but for now at least My wife can have warm feet!
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Senior User
Joined: Oct 2006
Posts: 210
Likes: 2
From: Welland, On
My diesel vacuum pump does not run all the time. It shuts off once the vacuum canister is full of vacuum. If yours is running all the time there is definitely a vacuum leak. I would be afraid of burning out the pump if it runs all the time.
Thread Starter
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Freshman User
Joined: Sep 2012
Posts: 36
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From: Brampton
ESOF in Auto hub position works now too, but as suspected I will need to find a leak somewhere or faulty pressure switch because it doesn't shut off. Either cannister never gets to pressure or sensor does not shut off pump.
Going to review schematic that Yahiko has.
Thanks all
Going to review schematic that Yahiko has.
Thanks all
Senior User
Joined: Apr 2011
Posts: 322
Likes: 2
common place for leak is where the vac lines hook up to the hubs. If you look at back of front tires you will see where the line attaches to the hubs. Unhook one line at at time and plug line with something(a golf tee works really well) and see if you pump shuts off. If so you foun your leak
Thread Starter
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Freshman User
Joined: Sep 2012
Posts: 36
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From: Brampton
As it truns out, my pump was faulty and when running, sometimes created a vacuume, and others times not. Turns out the one from my 08 parts truck fit fine. Thanks for the help all.