dougrainer wrote:
Ductape wrote:
Nonsense. Mine does not leak. Any tech worth his pay can find and fix the leak in the a/c.
Leak was a wrong choice of words. I should have stated that when the engine goes to zero vacuum, the demand on the vacuum from the After market AC systems uses up the small amount of vacuum in a few minutes. I state this from working on Dash AC motorhome systems for 36 years and after numerous various manufacturers attempting to replace actuators/hoses/vacuum reservoirs, they ALL stated, this type problem is NORMAL. If you want to eliminate the problem, you install the 12 volt vacuum pump on Gasoline Class A chassis. Even Diesel chassis's, you will get customers that come in and complain about this buzzing noise they hear while in transit for a few seconds all the time. That noise is the 12 volt vacuum pump replacing the used/lost vacuum. It runs for about 1 minute after the RV has not been driven to vacuum up the system and then runs a few seconds whenever the vacuum has dropped down. BUT, IT IS A NORMAL PROBLEM. Especially on Ford Chassis's. For the cost to use as mityvac and troublshoot the actuators and hoses to find a possible leak at a shop is way more than just purchasing a 12 volt vacuum pump and installing and eliminating the problem. Doug
dougrainer, I am not a professional RV HVAC repairman and I've never knowingly has a vehicle with an aux pump. I can see in a flash that there are assist pumps from as low as $50 to as high as $500. I do, however, have a question for you, how do you hook the pump up to the vacuum system? I see pumps with a single hose connector and some with two. I kinda figured that the one connector pump needs a tee and is between the reservoir and the HVAC selector switch, the two line, I figured was an inline and would go in the same place. Second question, there are several pumps available for Ford trucks, is there anyone better than another.
I want to file this away for future use as I have a Chevy based rig an I mine fixed and I don't have problems at this time.
TIA Dave
