79sd servo issues
 

i just put in a new amp not rebuilt and rebuilt servo-got air flow with blower for about 5 seconds then nothing,now i get heat but very low flow and no cold air flow-any ideas as to how to evaluate if rebuilt servo is working.i know there is an inline fuse in fuse box as well.i aslo know about temp sensor at dash,but i dont know where to go from here.servo came from ebay-this guy dougstar-was recommended by another member .

Have you checked the main vacuum switch to assure it is functioning? If it's not working, nothing else will. You can jump the wires coming out of that vacuum switch to test it. I have a link in here to the servo manual. If you search on my user name and servo, it should show up. It has lots of test procedures in it.

i will check your link,where is main vacume switch/

Behind the glove box.

whats it look like ive got glove box out is it near amp?

i see it,so are you saying to connect the two vac lines together and see if it works bypassing vac unit?

FYI
 

Servo service manual
http://www.peachparts.com/shopforum/general-information/240606-evil-servo-service-manual.html#post2053754





Good luck. :)

No, connect the electrical wires that are connected by the vacuum switch when it operates.

turns out its my blower motor,got a used one coming

I've got a thread on here with pictures showing how to much new brushes in a 116 blower motor.

Grin
 

:D

116 blower failure diagnostics
http://www.peachparts.com/shopforum/diesel-discussion/240542-116-blower-failure-diagnostics.html#post2052909

Disassembling a 116 blower motor
http://www.peachparts.com/shopforum/diesel-discussion/243799-disassembling-116-blower-motor.html#post2093283

Replacing the brushes on a 116 blower motor
http://www.peachparts.com/shopforum/diesel-discussion/244338-replacing-brushes-116-blower-motor.html#post2100313