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Old 08-20-2011, 12:22 AM   #12
azharj
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Join Date: Jan 2011
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Re: Solution to A/C switching vents on its own under engine load.

jerryw2314
It is very easy to remove. There are a lot of mails and photoes to illustrate it Just type "changing AC Blender motor windstar" or "HVAC system windstar" on net search and u will find answer.
I made this instrument by turning to stiff wires into U which fits in the wholes in the front of the heater. Push the wires in the wholes and while pulling the radio apart them
http://www.instructables.com/id/Rewi...Ford-Windstar/
http://www.youtube.com/watch?v=iSbzR...eature=related
http://www.youtube.com/watch?v=2tN2nZjjw_M
http://www.heatertreater.net/Windstar%20Listing.html
http://www.lifeasbob.com/CategoryVie...BWindstar.aspx

I fixed the issue of vent deflection to the defrost position. I made two amendments:
1.) fixed check valve vertically see diagram No. 1.
2.) repositioned the whole check valve and vacuum reservoir assembly inside, under the dashboard
I fixed the valve vertically because the air can travel from the white side to the black side only. In the central cylindrical part which is between the two white and one black tubes (marked red), (diagragm No. 2&3) there is small thin circular plastic disk like membrane. This plastic membrane closes the way back to white tubes. If the valve is vertical, the sheet will be horizontal, thus closing the white tubes by its weight, all the time.
One of the white tubes of the valve is connected to the vacuum canister. From the other white tube , a black hose goes to the control knob, from which different hoses go to the different actuators. See the connection diagram (NO. 4) of the hoses. Leak can occur at any of the connection points between manifold and the red hose, hoses and check valve, vacuum canister, control knob, and actuators; and the hoses, check valve, vacuum canister and actuators themselves. However, the most probable site of leak is on the engine side, where the changes in the temperature due to engine heat and cold external temperature can damage the plastic parts by making them inflexible.
I removed the hose, the canister and check valve, which I had replaced recently, plugged the open ends, dipped all of them in a bucket of water and applied air pressure to the other end. I came to know that all the joints and vacuum canister were leaky, even though I had secured all the joints with silicon and steel wires. There was a small phalange of residual plastic material along the whole length of the tubes of the valve. This phalange was preventing airtight fitting of hoses with the check valve. I repaired the leak of the vacuum canister with glue and filed the phlange to smoothen the tubes of the check valve. I took a long new hose. Connected it to the manifold on the one end and firmly tied the other end to the black hose, which is connecting the vacuum canister to the control knob, and pulled the new hose inside.
I could find much place behind on the glove box just on the passenger side of the central console and fixed the check valve and vacuum canister on the new place; so that access any future service will be easy. Other advantage was that it gave much space to replace the metallic Y shaped heater hose later on.
Alternatively, leak can be detected by creating 15-inch vacuum in all hoses, check valve, canister, control knob and actuators; fall in vacuum by 1 inch per min will indicate leak in thesystem but not the site of leak. Blowing under water method is simple not requiring any pump/ tool simply blowing in the vacume can detect leak and also the site of leak not possible to detect the leaky actuators knobs etc. See link http://www.automotiveforums.com/vbul....php?t=1074091
http://www.automotiveforums.com/vbul....php?t=1050429
http://www.automotiveforums.com/vbul...02#post6921202
Attached Images
File Type: jpg Fig 1 check valve vertile.jpg (66.1 KB, 67 views)
File Type: jpg Fig 2 vacuum check valve1.jpg (35.2 KB, 63 views)
File Type: jpg Fig 3 vacuum check valve.jpg (34.6 KB, 57 views)
File Type: jpg Fig 4.JPG (85.5 KB, 64 views)

Last edited by azharj; 04-01-2013 at 03:12 PM.
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