Pinegrovesubaru Posted October 25, 2009 Share Posted October 25, 2009 2006 Legacy 2006 heater works great on the drivers side, but only blows cold air on the passenger side. The same situation happens in the defrost mode (hot air out of the left vent, cold air out of the right vent). The quantity of air varies with the fan speed, but the air is dead cold on the passenger side. I looked under the dash and behind the glove compartment and found nothing. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 25, 2009 Share Posted October 25, 2009 Dual climate control? You have a bad electric motor in the HVAC somewhere. nipper Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted October 26, 2009 Author Share Posted October 26, 2009 I do not have dual control. I can only access the area through the glove compartment. Is there a way to get the the motor that may be bad? Is it in the center or the left side? While I was looking for the problem I came across a white electrical connector that was disconnected. It is under the carpet, at the top edge of the passenger side floor mat. I reconnected it but it did not seem to do anything. I'm not sure what the electrical connector is for, or if was apart from the factory. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted October 27, 2009 Share Posted October 27, 2009 It may be a diagnostic plug. I'd leave it unplugged. Most of the climate control system is in the center of the dash on cars these days. Usually requires removal of nearly the entire dash to gain access. You still under warranty? Quote Link to comment Share on other sites More sharing options...
nipper Posted October 27, 2009 Share Posted October 27, 2009 Make sure the airways arent clogged with anything. the way this system is made I can't imagine a scenraio like this unless it is parked in my driveway. nipper Quote Link to comment Share on other sites More sharing options...
ericem Posted October 27, 2009 Share Posted October 27, 2009 Make sure the airways arent clogged with anything. the way this system is made I can't imagine a scenraio like this unless it is parked in my driveway. nipper perfect!! check out your incar cabin filter!! Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted October 27, 2009 Author Share Posted October 27, 2009 I have no cabin air filter (removed it a year ago). I checked the cabin air filter housing and it was clean. The car is parked inside except when parked in work parking lot. Any suggestions on how to remove the center dash without damaging any of the plastic and vinyl? Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted October 27, 2009 Author Share Posted October 27, 2009 The car has 92K miles, so I don't think they will fix this under warranty. Quote Link to comment Share on other sites More sharing options...
ericem Posted October 27, 2009 Share Posted October 27, 2009 check out legacygt forums. Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted October 31, 2009 Author Share Posted October 31, 2009 I have more information on this: I removed the center counsel to get a better look at everything. The motor that moves the damper between vent, heat, and defrost is working properly. The recirculate/fresh air motor and damper are working properly. The linkage for the cold to warm adjuster is working properly. I could look into the air ducts to see the heater coil but I tried. Having everything apart confirms the left duct is hot, the left-middle duct is warm, the right-middle duct is cool, and the right duct is cold. I can't imagine the right side of the coil is blocked and the left side is open, but that is how it is acting. Any suggestions as to how to get to the hot water coil to inspect it? What boggles my mind is that the quantity of the air is the same all the way across the four ducts, but the air goes from warm on the left to dead cold on the right. Thank you for any ideas that you have. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 31, 2009 Share Posted October 31, 2009 If you have heat and AC there is no reason to try to get to the heater core. What happens if block the outlets that have air flowing in them? Drop the blower motor and clean out the squirrel cage and the HVAC box. nipper Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 1, 2009 Share Posted November 1, 2009 This sounds like a common issue in some Ford and Lincoln cars with dual climate control systems. On those cars there is a valve that controls coolant flow to two separate heater cores. The valve nearly always fails one side fully open. So one core gets full flow of hot coolant, and the other is still regulated normally. Resulting in one side of the cabin getting hot air no matter what the setting, heat or AC, and the other side functions perfectly. I don't know anything about the climate systems on newer Subarus, but I can see how this may be a possibility if your car has a similar setup. Open the hood and try to find the hoses for the heater core. They're usually pretty easy to identify, but hard to follow because engineers always choose the most twisted and obstructed path they can find to route them. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 It's not dual climate (I asked), as that would have been to easy. nipper Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 1, 2009 Share Posted November 1, 2009 Yes, but what's to stop them from using two separate cores even though it only really needs one? Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 Yes, but what's to stop them from using two separate cores even though it only really needs one? Expense Compliaction Weight Common sense Space It's just not done that way. nipper Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 1, 2009 Share Posted November 1, 2009 Sound like perfect examples of automotive engineering to me. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 Sound like perfect examples of automotive engineering to me. Thats what i am Just for that your car gets four heater cores. Quote Link to comment Share on other sites More sharing options...
bheinen74 Posted November 1, 2009 Share Posted November 1, 2009 4 heater cores seems simple compared to SVX heater core replace as someone pictures here:lol: who ws the designer of this beast again roflmao Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 For a part that is not meant to be replaced often it seems fine to me. there are only so many ways to install things, but i will admit Jags do confound me. Anything you do on them starts with "step one remove engine", especially whenall you wanted to dowas repalce the glove box bulb. nipper Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 1, 2009 Share Posted November 1, 2009 I like my truck more and more when I see pictures like that. Thats what i am Just for that your car gets four heater cores. Well sorry if I stepped on your feelings, but maybe we should get back on topic. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 I like my truck more and more when I see pictures like that. Well sorry if I stepped on your feelings, but maybe we should get back on topic. Thats no fun Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted November 1, 2009 Author Share Posted November 1, 2009 Thank you for your humorous back and forth. I traced the hoses and there is only one supply hose and one return hose going through the firewall. I tried taking off the blower motor yesterday but I couldn't get the top nut free. As I was struggling with this I noticed the AC coil would get the air first, the heater coil would get the air second. So if somehow a leaf made it though the blower, it would have gotten caught on the AC evaporator before it got caught on the heater coil. Once I realized that I decided not to remove the blower (upper nut pain in the a** anyway!) Inside the ductwork, on the damper that moves when the cold to hot knob is turned, is is possible that one side broke free from the shaft and is not turning? I'm thinking about going to a scrap yard under the guise of getting a heater coil to take everything apart to see how they assembled things at the factory. Does anyone know if drawings showing the assembly are on line? Or perhaps even a repair manual? Quote Link to comment Share on other sites More sharing options...
bheinen74 Posted November 1, 2009 Share Posted November 1, 2009 is it possible its a single heater core, but with 2 valves. reason being, they did make a dual climate control model hvac system, and that would probably have 2 valves, one for each side in the passenger compartment. Now, on a non dual climate control model, maybe it still has 2 valves but they operate in unison, and maybe that 2nd valve is not working?????? maybe your lever, rod, acuator came loose from the one valve, or maybe the one valve is stuck. I do not even know if there are 2 valves, but could very well be. Quote Link to comment Share on other sites More sharing options...
nipper Posted November 1, 2009 Share Posted November 1, 2009 is it possible its a single heater core, but with 2 valves. reason being, they did make a dual climate control model hvac system, and that would probably have 2 valves, one for each side in the passenger compartment. Now, on a non dual climate control model, maybe it still has 2 valves but they operate in unison, and maybe that 2nd valve is not working??????maybe your lever, rod, acuator came loose from the one valve, or maybe the one valve is stuck. I do not even know if there are 2 valves, but could very well be. Except he said he does not have dual climate control. Also they use one heater core and one ac evap for dual climate control. they just add in additional doors and motors to make it work. Quote Link to comment Share on other sites More sharing options...
Pinegrovesubaru Posted November 2, 2009 Author Share Posted November 2, 2009 I use Bar's Leak and the Subaru conditioner ("blue goo") in the antifreeze. What do you think about the possibility that the Bar's Leak has plugged the end of the coil. That would be the passenger end of the coil (where the flow would be the lowest)? I'm thinking about doing a super flush and seeing if it helps any. Quote Link to comment Share on other sites More sharing options...
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