Plenum vacuum motor
#1
Plenum vacuum motor
I don't know if the heat is the cause of this but I'm having an odd problem with the vacuum motor that controls the plenum panel-door for the registers.
I first noticed this one day after the Sun was blasting through the back window of my truck. Every part of the interior was HOT to the touch. AC was coming only from the defrost-vents, which is the 'default' for no vacuum. Going through the various settings of the Function switch did nothing to resolve. Eventually the panel-door motor got vacuum and closed that door. This has happened a few times, even when the interior isn't in the Sun. What I'm looking for is a source for that single-port vac motor. SM doesn't list the part number. RA doesn't have and I haven't found anyplace that does have it. It should be a fairly common motor for many model years and maybe even other manufacturers. Any ideas for a source would be a big help. The Ford part number would be a big help also. Thanks
I first noticed this one day after the Sun was blasting through the back window of my truck. Every part of the interior was HOT to the touch. AC was coming only from the defrost-vents, which is the 'default' for no vacuum. Going through the various settings of the Function switch did nothing to resolve. Eventually the panel-door motor got vacuum and closed that door. This has happened a few times, even when the interior isn't in the Sun. What I'm looking for is a source for that single-port vac motor. SM doesn't list the part number. RA doesn't have and I haven't found anyplace that does have it. It should be a fairly common motor for many model years and maybe even other manufacturers. Any ideas for a source would be a big help. The Ford part number would be a big help also. Thanks
#4
#6
#7
Dave,
I've PM'd him to bring his attention to this thread.
I feel for all of you down there dealing with the drought.
I'm sure it is bad for crops, livestock and citizens alike.
Here in Connecticut there were only a couple of deaths attributed to the storm.
Some houses and bridges were washed away but right now it's a matter of clearing downed trees to make roads passable and restoring power to 800,000 people.
We're very fortunate that Irene's winds died down and her speed increased.
If the storm had hung around longer the already saturated ground would have turned to soup.
I've PM'd him to bring his attention to this thread.
I feel for all of you down there dealing with the drought.
I'm sure it is bad for crops, livestock and citizens alike.
Here in Connecticut there were only a couple of deaths attributed to the storm.
Some houses and bridges were washed away but right now it's a matter of clearing downed trees to make roads passable and restoring power to 800,000 people.
We're very fortunate that Irene's winds died down and her speed increased.
If the storm had hung around longer the already saturated ground would have turned to soup.
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#8
#9
I don't know if the heat is the cause of this but I'm having an odd problem with the vacuum motor that controls the plenum panel-door for the registers.
I first noticed this one day after the Sun was blasting through the back window of my truck. Every part of the interior was HOT to the touch. AC was coming only from the defrost-vents, which is the 'default' for no vacuum. Going through the various settings of the Function switch did nothing to resolve. Eventually the panel-door motor got vacuum and closed that door. This has happened a few times, even when the interior isn't in the Sun. What I'm looking for is a source for that single-port vac motor. SM doesn't list the part number. RA doesn't have and I haven't found anyplace that does have it. It should be a fairly common motor for many model years and maybe even other manufacturers. Any ideas for a source would be a big help. The Ford part number would be a big help also. Thanks
I first noticed this one day after the Sun was blasting through the back window of my truck. Every part of the interior was HOT to the touch. AC was coming only from the defrost-vents, which is the 'default' for no vacuum. Going through the various settings of the Function switch did nothing to resolve. Eventually the panel-door motor got vacuum and closed that door. This has happened a few times, even when the interior isn't in the Sun. What I'm looking for is a source for that single-port vac motor. SM doesn't list the part number. RA doesn't have and I haven't found anyplace that does have it. It should be a fairly common motor for many model years and maybe even other manufacturers. Any ideas for a source would be a big help. The Ford part number would be a big help also. Thanks
Which blend door are you having the problem with? There are several different motors, depends on which blend door they operate.
Is the A/C factory or dealer installed?
And, are these parts for the '81 F100 in your sig?
btw: If the A/C is factory, the problem may have nothing to do with the blend door motor, because there is something else that "runs" the show, this little charmer:
A/C Vacuum Control Selector Valve Assy. Once I know all the particulars, will type a thesis on what this valve does...and how it affects the blend door motors.
#10
Factory AC: I'm intimately familiar with the plenum system/AC & Heater systems. Over the 30yrs I've owned this vehicle, I've operated on various illnesses the plenum contracted; The dreaded blend door hinge failure/temp control cable break/function control replacement and a number of other old-age problems. This latest problem does not occur when the interior isn't over-heated by the outside ambient temp.
Most likely it is a plastic-hose fault. I've only experienced this problem lately due to my 1-car garage being occupied by my Harley. Cadillac is relegated to the driveway and the truck parks in the street (East/West facing)
Thanks
#11
I need to know a coupla things before I post the part numbers/sources that have them if obsolete.
Which blend door are you having the problem with? There are several different motors, depends on which blend door they operate.
Is the A/C factory or dealer installed?
And, are these parts for the '81 F100 in your sig?
btw: If the A/C is factory, the problem may have nothing to do with the blend door motor, because there is something else that "runs" the show, this little charmer:
A/C Vacuum Control Selector Valve Assy. Once I know all the particulars, will type a thesis on what this valve does...and how it affects the blend door motors.
Which blend door are you having the problem with? There are several different motors, depends on which blend door they operate.
Is the A/C factory or dealer installed?
And, are these parts for the '81 F100 in your sig?
btw: If the A/C is factory, the problem may have nothing to do with the blend door motor, because there is something else that "runs" the show, this little charmer:
A/C Vacuum Control Selector Valve Assy. Once I know all the particulars, will type a thesis on what this valve does...and how it affects the blend door motors.
Thanks
#13
1) D9AZ-18A318-C (Motorcraft YH-350) / Obsolete
A/C Heat Door-Located on Plenum Chamber-One Port.
1980/86 F100/350 & Bronco / 1979/89 LTD/Crown Vic/Mercury Grand Marquis.
20 available NOS from FoMoCo Dealers/obsolete parts vendors.
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2) EOTZ-18A318-A (Motorcraft YH-362) / Obsolete
Recirculating Fresh Air Door located on Evaporator-One Port.
1980/89 F100/350 & Bronco.
29 available NOS from FoMoCo Dealers/obsolete parts vendors.
------------------------------------------------------------
3) EOTZ-18A318-B (Motorcraft YH-363) / Obsolete
Defrost Door-Located on Plenum Chamber-Two Ports.
1980/89 F100/350 & Bronco.
21 available NOS from FoMoCo Dealers/obsolete parts vendors.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
EOTZ-19B888-B .. A/C Vacuum Control Selector Valve Assy (Motorcraft YH361) / Obsolete
This little charmer (a notorious POS!) mounts to the backside of the A/C Heater control panel, all the vacuum hoses connect to it.
When you slide the lever on the control panel, this valve opens one blend door and closes another.
This valve also has the A/C 'kicker switch' mounted to it. Turns on the A/C (an audible CLICK is heard) by sliding the lever to A/C.
1980/82 F100/350 & Bronco.
139 available from FoMoCo Dealers/obsolete parts vendors.
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Pick the part(s) you want, let me know, I'll list the sources closest to you.
Check the ends of the vacuum hoses where they connect to these motors. When they age, they crack, allowing vacuum to escape.
Check the vacuum hoses to make sure none are kinked.
#14
No. When it 'defers' to the defrost, the air is plenty cold. Now it could be the register panel-door acting that way tho (sticking closed)... When it get to sweater-weather (80s) I'll fool around under the dash and determine what's what, assuming my old-time fix didn't work.