08-05-2026, 11:11 PM
BarthBluesmobile1986: vacuum lines for climate controls
Hi,
The P30 uses vacuum lines, sourced at the engine, to operate the doors that control flow of the heater and window defogger. I think my defogger last worked in 2009, and this is now the priority for me. Some of the vacuum lines have turned to dust.
Has anyone done this work, and do you have any advice or pointers? I haven't found anything in the forum history on this.
Matt
08-06-2026, 09:26 AM
billyt53Good morning Matt, what brand is your dash AC? Back in the day there were Frigette, Acme, etc. There would have been a sticker on the evaporator housing. Worst case, post a picture of the dash control, I may be able to identify it and find a vacuum schematic.
Billy
Billy & Helen Thibodeaux
Retired from Billy Thibodeaux's Premiere RV, Inc. Scott, LA 70583 I-10 Exit 97-Our Son now owns it!
The Farm is near Duson, LA I-10 Exit 92 then N 1 mile on right
Three Full 50 Amp RV Hookups !
billynhelen@me.com
Data Tag: 9404-3908-36XI-2C
1994 Sovereign 36' Widebody on Spartan IC (Mountain Master Lite) Chassis.
Powered by a Cummins ISL9-450
Onan 8,000 Quiet Diesel Genset
Toad: 2018 Chevy Colorado ZR2 Diesel
