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Topic: Dash AC/Heat vents defrost only (Read 297 times) previous topic - next topic

Dash AC/Heat vents defrost only

The dash AC/Heat vents work through defrost only.  Is this vacuum activated? If so, where is the vacuum pump located?
Other ideas or tips.

I searched the forum but could only find references to coaches older than mine.

Thanks for your help!

Don
Don & Sue
2009 NImbus 38
2020 Jeep Grand Cherokee toad

Re: Dash AC/Heat vents defrost only

Reply #1 –
Mine is vacuumed operated and it fails to defrost, the vacuum pump is under the steps.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Dash AC/Heat vents defrost only

Reply #2 –
Being a 2009 coach it is very likely electric. I had posted the wiring diagram on here when I was trying to troubleshoot mine. I had first thought it was a bad brain and bought new one. After installing I still had same problems. Mine turned out to be bad relay.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Dash AC/Heat vents defrost only

Reply #3 –
Most of us have coaches older than yours. My guess would be to call the company and ask them where that is. Mine is located in the front grill vacuum operated, who knows where yours is. Check your wiring diagrams if you have them. I unfortunately do not. Good luck in finding a solution to your problem.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired
 

Re: Dash AC/Heat vents defrost only

Reply #4 –
Auto & RV dash heater/AC units have ducts with doors to direct air flow in different directions.  These doors may use vacuum or electric motor to move them from their default DEFROST resting position.  So when the system that moves doors fails, air will flow to defrost position for safety.