A/C Vacuum Motor Repair

bchampion

Member

Jun 7, 2004

118

0

17

Lafayette, LA

Apr 22, 2009

#1

• Apr 22, 2009

• #1

So 2 out of the 4 vacuum motors for my factory a/c are not holding vacuum, which is causing my woes. All my air is blowing out of my heater duct at the floor. So I have both of them off and they will not hold any vacuum what-so-ever. Is there a way to repair them and get them working again?

Thanks,

 

G

Grayle

Founding Member

Nov 7, 2002

63

0

0

Otsego, MN

Jun 2, 2009

#2

• Jun 2, 2009

• #2

wow, I just found this thread using google and can't believe no one responded! I have the same problem on my 67 and so far I haven't taken a real good look at them yet. I have seen new ones at npd for about $52.(more then I want to spend) I will try to take one apart and see if its repairable.

 

2

2+2GT

10 Year Member

Apr 25, 2009

3,333

10

79

Southeastern Pennsylvania

Jun 2, 2009

#3

• Jun 2, 2009

• #3

Grayle said:

wow, I just found this thread using google and can't believe no one responded! I have the same problem on my 67 and so far I haven't taken a real good look at them yet. I have seen new ones at npd for about $52.(more then I want to spend) I will try to take one apart and see if its repairable.

Click to expand...

Having them rebuilt costs more than new ones.

 

G

Grayle

Founding Member

Nov 7, 2002

63

0

0

Otsego, MN

Jun 3, 2009

#4

• Jun 3, 2009

• #4

Well, I took a look at one and found the source of the leak. I put some medical grade silicone on a toothpick and smeared it over the small crack on the side wall of the diaphram. It doesn't hurt to try. I'll post back with the results.

 

G

Grayle

Founding Member

Nov 7, 2002

63

0

0

Otsego, MN

Jun 5, 2009

#5

• Jun 5, 2009

• #5

Success! I repaired two of my leaking vacuum motors with silicone. First I found the leak by blowing air into the motor and tipping the diaphram to find the crack with a flashlight. Secure the tipped diaphram by clamping on the bracket extended out from the diaphram. I then cleaned the area with isopropyl, scuffed the rubber with a bottle brush, smeared medical grade silicone over the crack, and sucked air through the crack to draw in the silicone and let it dry for 24 hrs. I don't know how long this fix will last, but I have put off spending $100 for a while! Grayle

 

bchampion

Member

Jun 7, 2004

118

0

17

Lafayette, LA

Jun 8, 2009

#6

• Jun 8, 2009

• #6

I just went ahead and spent the $100 on 2 new ones. If my other 2 old ones go out, I'll try your fix.