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Old 02-01-2007, 07:03 PM   #1
arcsound
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Member#: 10603
Join Date: Sep 2001
Location: Richmond
Vehicle:
2014 CrossTrek XV
Khaki

Default Heating System Question; 04 Forester

I have an '04 Forester XT which since Day 1 has had a problem with the heating system; when I start the car on cold mornings, and after the engine reaches NOT, the heat comes on full heat, regardless of the Temperature knob setting, except totally off (fully CCW). After about 20 minutes of driving, the Temp knob begins to respond normally, and I can select any temperature, from luke warm to extremely hot. Note: I have the climate control system, not the manual system, but I am always using it in the "manual" mode, i.e. Auto light off.

Has anyone else experienced this phenomenom? I would prefer not to choose between sweltering and shivering during the first part of my commute...
The dealer said they couldn't find anything wrong with the system, (of course...).
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Old 02-03-2007, 05:41 AM   #2
06grayrex
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I have heard that a lot of legacys have had a simular problem with the climate control but do not remember what the exact cause was. There maybe a problem with the programming that controls the air blend doors: ie vacuum leak or climate control unit itself????????????
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Old 02-03-2007, 07:54 PM   #3
Alan
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BRIGHT BLUE!

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You need to take the fan control off the auto position if you want manual control of air flow. Otherwise if car is colder inside than about 50 degrees the fan will automatically try to put out full heat until the temperature sensor is warmed up.
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Old 02-04-2007, 03:58 PM   #4
frogmonk
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'04 FXT/'05 Baja T/
'71 ff-1

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This is a known and common problem. Here is one fix that I've installed on my FXT. It doesn't completely solve the problem, but it works better than w/o the fix,:http://www.geocities.com/samiam_68/S...CS/SSC_Fix.htm
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Old 02-09-2007, 11:12 PM   #5
arcsound
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Khaki

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Thanks to all the responders. Unfortunately, I think my situation is somewhat different, in that I am experiencing the problem while in the "manual" mode, i.e. not with the climate control system activated. It seems to be related to how the Temp control knob controls the coolant flow going to the heater core, i.e. it seems the valve is wide open regardless of the knob position, for the first 15 minutes or so after starting the car from cold. Weird.
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Old 02-10-2007, 12:34 AM   #6
Alan
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2006 WRX Wagon
BRIGHT BLUE!

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The Temp control does NOT control the coolant, just the position of the airflow door (flap) inside the heater box. The coolant flows through the heater core all the time. I wonder if the door is sticking due to frozen moisture inside the heater box and when it warms up it thaws and then moves freely.

And in cold mornings the heater should come on full hot until the sensor is warmed beyond 50F or so.
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Old 02-10-2007, 10:37 AM   #7
arcsound
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Khaki

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Interesting, this information re: the actual workings of the heater control mechanism helps. (Note: I can rule out freezing of the flap, since it also occurs when the ambient temp is above freezing) It is starting to sound like it is actually behaving "normally", which is too bad that Subaru would think that baking the customer is a good thing. Why couldn't they have offered Climate Control as an option on the XT, as I certainly prefer manual HVAC controls?!
So, the mod previously mentioned may help, by getting the "system" to realize the interior is actually warm enough to start closing the flap (earlier...)?
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