No A/C from vents

Tiny
COBRA1996
  • MEMBER
  • 1999 FORD F-550
  • V10
  • 2WD
  • AUTOMATIC
  • 30,000 MILES
This is a 1999 ford V 10 motorhome. The air only comes out of the defrost when I remove a cap over an opening from the plenum and push open the door behind it the air comes out the vent right there at the plenum, but not at the rest of the vents. Not sure because of a lot of air coming out where the cap should be. This is a SCS 086-00324 plenum assembly.
Wednesday, July 22nd, 2020 AT 6:04 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,212 POSTS
The description sounds like a mode door control failure. Being a motorhome with a Ford chassis it would depend on what actual system they used as it isn't from Ford. SCS is now Victory Climate Systems. You might be able to get some information from them about it. Many of the systems used in RV's were vacuum controlled so you might want to see if you can find the control that moves the doors, it could be a line has cracked or fallen off.
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Wednesday, July 22nd, 2020 AT 7:36 AM
Tiny
COBRA1996
  • MEMBER
  • 2 POSTS
I contacted Victory Climate Systems to no avail. Some say that the vacuum canister is on the chassis by the front passenger tire but I can't seem to find it. Do you know where the vacuum origin is located on the V 10 hopping that I can see it without removing the doghouse. Would you have a diagram of the vacuum system. I can remove the plenum would that give me access the the actuators because seeing them or anything else for that matter is difficult from under the dash.
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Thursday, July 23rd, 2020 AT 4:14 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,212 POSTS
On most of the ones I have seen the actuator is on or very near the plenums as they are a more or less stand alone modular part and sort of a drop in piece. They add more holes to the systems and increase the sizes of the case based on the BTUs the unit is capable of but try to keep it as a single component. One of those cheap USB inspection camers you can use with a phone or tablet might be helpful as you could look around the various parts rather than taking it all apart.
The vacuum source will be on the intake manifold but none of the OEM diagrams would make much difference because RVs only use the rolling chassis, dash and steering columns for the most part. Everything else is a custom item.
What is the brand and model of the RV, there could be a source for the information online.
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Thursday, July 23rd, 2020 AT 10:58 AM

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