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  #1  
Old 04-30-2005, 12:14 AM
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Location: Tucson, Arizona, USA
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Questions about Climate Control Vaccuum

Hi all,
On my 87 300D the center dash vents quit working. Before I tear out the dash to replace the pods, I'd like to do some testing. Work was done both under the hood and under the dash just before the center vents quit working. I searched for broken vaccuum lines but had a hard time locating the right ones. The manual is vague and the color abbreviations on the diagrams are unintelligible to me.
Can I remove the push button control assembly and test for vaccuum leaks at that point? Is the control assembly hard to remove? At least the manual shows numbers for the various ports at the control, so I can tell which line goes to where.
Thanks for any help............Brian

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87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
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Old 04-30-2005, 10:07 AM
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Oh one more question, Is the tan vacuum line thats spliced in to the brake booster line under the hood the main feed to the control?
Thanks
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Brian
87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
05 Chevy Express 1 ton w/Royal Utility box 120K
08 Infiniti FX-35 40K
15 Golf Sportwagen TDI 35K
10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K
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  #3  
Old 04-30-2005, 12:30 PM
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Talking well just went threw the same thing

it trun out to be my a/c control i checked all my vac pods they were ok but the A/c control was bad the bad thing was i replace it because it would not light up at night the bulbs melted the controler so i replace it then 2 month later it stoped comeing out the center vent check every thing then i put the old control unit back in it worked fine so it looks light i will have to feel around at night driveing for thr buttons LOL
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  #4  
Old 04-30-2005, 12:33 PM
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Join Date: Mar 2005
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Is it only the center flap that dont work? If all the flaps arent working, then the main vacuum line(green w/ yell. stripes) might have been pulled out. Look under your dash. If its only the center flap, it could be a number of things - a shorted switchover valve, center pod leaking, bad control assy.
I think there was a recall for some 124 ACC conrol unit.
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Old 04-30-2005, 08:52 PM
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ok heres what i did. First i pulled out the glove box and checked each of the actuators separatley by removing each vacuum line one at a time and evacuating it with a mighty vac. well the ones that go to the recirculate actuators won't hold vacuum even for a second. The one for the center flap pumps up then slowly leaks down. The only one that really holds 100% is defrost. I even capped off the main supply at the pump under the hood and checked the supply at the valve, it too leaked down slowly. Now when I connect the center vent flap directly to the supply, bypassing the valve, it stays open. So I am thinking I probably have a number of leaks, enough to where there is not enough vacuum left to hold the center actuator open when the other actuators are hooked up.
Anyone know how much vacuum the supply at the valve should be? And how to convert mbar to inches?
I am also curious as to the routing of the supply to the valve. At the valve it is green with yellow stripes but I could not find it under the hood.
Thanks, Brian

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Brian
87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
05 Chevy Express 1 ton w/Royal Utility box 120K
08 Infiniti FX-35 40K
15 Golf Sportwagen TDI 35K
10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K
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