Hi,Now that it's a bit chillier, I've noticed the temperature control knob on my dash is almost either full-on hot or full-on cold. There's a few degrees where I can adjust it between the two, but it's only a few degrees of the full rotation of the knob and it's impossible to get the temperature just right.Any suggestions on what might be wrong? I'm fairly handy and willing to fix things, but I don't know where to start when it comes to the dash climate control system.I have a 2011 Winnebago Itaska 32K which has a Ford chassis.Thanks for any help or suggestions.

Apparently no one ever told Ford Trucks how to build a temperature control that works. Mine have all been the same way, either on or off, no in between.

The cockpit control sends an analog signal to the flapper valve control module. If this module (forward of the firewall) has ever been subjected to moisture (as in condensation etc) it will corrode and fail to operate the flapper valve correctly.

You might install a manual water cut-off to your heater core. That may also give you colder a/c in the summer.It helped my '04' Newmar WH chassis.

hikerman wrote:You might install a manual water cut-off to your heater core. That may also give you colder a/c in the summer.It helped my '04' Newmar WH chassis.true sometimes when using AC only but OP is trying regulate the cabin air temp while in heater mode.sounds like the controll switch sends too much vacuum to the control module and its either closed or open and not staying part way

One option is operator understanding errorThere are basically 3 types of temp controlsone restricts water flow in the heater coreOne mixes air that passes through the heater core with air that bypasses the heater controland one::::: IS an actual thermostat that will switch between "VENT" (cold) and "HEAT" (heater) as needed.

Dash Temperature Control: Hot or Cold, no inbetween

25 Replies

wa8yxm
Explorer III
Nov 20, 2016
One option is operator understanding error

There are basically 3 types of temp controls

one restricts water flow in the heater core
One mixes air that passes through the heater core with air that bypasses the heater control

and one::::: IS an actual thermostat that will switch between "VENT" (cold) and "HEAT" (heater) as needed.
usersmanual
Explorer
Nov 20, 2016
hikerman wrote:
You might install a manual water cut-off to your heater core. That may also give you colder a/c in the summer.
It helped my '04' Newmar WH chassis.

true sometimes when using AC only but OP is trying regulate the cabin air temp while in heater mode.sounds like the controll switch sends too much vacuum to the control module and its either closed or open and not staying part way
hikerman
Explorer
Nov 20, 2016
You might install a manual water cut-off to your heater core. That may also give you colder a/c in the summer.
It helped my '04' Newmar WH chassis.
Harvard
Explorer
Nov 20, 2016
The cockpit control sends an analog signal to the flapper valve control module. If this module (forward of the firewall) has ever been subjected to moisture (as in condensation etc) it will corrode and fail to operate the flapper valve correctly.
Johno02
Explorer
Nov 20, 2016
Apparently no one ever told Ford Trucks how to build a temperature control that works. Mine have all been the same way, either on or off, no in between.

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Dash Temperature Control: Hot or Cold, no inbetween

25 Replies

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