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Topic: Dash Air Stuck on Defrost/Vacuum Pump Replacement (Read 3214 times) previous topic - next topic

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #40 –
I'm having a similar issue where sometimes I can turn the A/C on and it will come out of the dash but after some time, it will switch to the defrost or floor on it's own.  Sometimes I can turn it on and it won't go to the dash, only defrost or floor. 

It looks like I have the same setup that Elliott posted.  Mine is mounted to the passenger side of the generator box.  Today I pulled the check valve out and put it on my Mighty Vac.  It will hold 15in-Hg for 15 mins, so I'm thinking it's good.  Next I connected the Mighty Vac up to the vacuum canister and pulled 18in-Hg on it.  It held that for at least 10 mins.  Then I connected the Mighty Vac to the vacuum pump and let the pump run (key on).  It was able to generate about 14in-Hg of vacuum, so I don't think my issue lies in this system.

Next I'll have to pull the dash apart and see if I have a leak in one of the lines from the solenoids to the dash vents.  Maybe the line from the dash control solenoid to the actuator is leaking.

Does it sound like my reasoning is sound?

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #41 –
Thanks Jason for the manual. The 2000 has 3 of the valves where the 1999 uses
4. I have downloaded the manual onto my labtop so thanks for it. I can never have
too many manuals.
Keith if you hold the vacuum in all the control valve switch, it could be an electrical
problem.

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #42 –
Old guy - your second picture is the solenoid valve.

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #43 –
Yes Rich and I have 4 and one of them is leaking. If I can't find a replacement in
Canada I will try Foretravel when I think the border is stable. I can live with just
the defroster working. I have a few other things that I need from Foretravel too.

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #44 –
Quote from: oldguy –
Keith if you hold the vacuum in all the control valve switch, it could be an electrical
problem.
Got the dash opened up and did some poking around.  Vacuum holds fine...turns out I appear to have a vacuum solenoid on the fritz.  It works intermittently, even though 12V is applied when dash air is called for.  Now I need to figure out where I can get one of these little guys.  Any ideas guys?

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #45 –
Quote from: WS6_Keith –
I appear to have a vacuum solenoid on the fritz.  Now I need to figure out where I can get one of these little guys.
"Where to get a solenoid?"  That's been the subject under discussion for the last 3 days.  Go back and start reading this thread from Reply #29.

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #46 –
As Rich said try Foretravel

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #47 –
Foretravel has a replacement.  It's not the same as the original and may need to be mounted differently, but it is available for $25 each.  Ordered one this morning from Brad.

Re: Dash Air Stuck on Defrost/Vacuum Pump Replacement

Reply #48 –
Thanks Elliott for the write up. Did this update with very little effort and works perfectly.