Dual Climate, No Heat on Driver's Side - Drive Accord Honda Forums
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post #1 of 49 Old 08-15-2009, 12:59 AM Thread Starter
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Dual Climate, No Heat on Driver's Side

The title says it all. I've read a few other complaints on other sites about this problem, but no solution. Is there some kind of door motor that controls how much heat is let into the cabin on the driver's side? Has anyone fixed this problem before or know how to fix it?

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post #2 of 49 Old 08-15-2009, 06:48 AM
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I haven't had that problem with my '03 EX-V6. Does the heat and AC work in single mode?
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post #3 of 49 Old 08-15-2009, 07:38 PM Thread Starter
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Um yeah. Basically no heat comes out on the driver's side at all no matter how much you play with the dual climate. Like I said I read a couple other complaints about the dual climate system. I did a little more research. For some reason the search function on this site doesn't give me the results I'm looking for. Anyway, the problem lies with a blend door motor.



http://www.hondaautomotiveparts.com/...y5=HEATER+UNIT

In the picture above, item 7 is the driver's air mix motor assembly, and I want to say that's the blend door motor that lets the heat in and out of the driver's side vents. Am I correct? If this is the part, how do I remove it and replace it?

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post #4 of 49 Old 08-15-2009, 10:46 PM
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Since you have a Dual Climate Control system, you really need to take the vehicle to the dealer. According to the Service Manual, the Climate Control system runs through the Multiplex Integrated Control System. Before the AC is tested, Honda will connect the vehicle to their HDS computer to determine if the fault is with the MICS before they test the AC system. Testing the Air Mix motor also requires a trip to the dealer. If you incorrectly apply power while testing the motor, you can fry the motor. There is an air mix motor for both the driver and passenger side.
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post #5 of 49 Old 08-16-2009, 11:11 AM Thread Starter
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Damn. I knew there were two air mix motors, one for the driver and one for the passenger. I didn't know that the problem would require a trip to the dealership. Well, I live in south Mississippi, and having the no heat on the driver's side isn't too much of a problem since we have an almost tropical climate here. I guess I'll set some money aside and see if I can get it fixed before next year.

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post #6 of 49 Old 08-16-2009, 12:30 PM
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The motor may not be bad, the door could be stuck too.
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post #7 of 49 Old 08-18-2009, 12:29 AM Thread Starter
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Touche! Is there an easy way to make the door unstuck? Can I just shove a wire in the vent and poke it? Lol.

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post #8 of 49 Old 08-18-2009, 09:38 AM
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hey, if you want heat this time on year for the driver's side, open the driver's side window....

biloxi, ms..... nuf said....

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post #9 of 49 Old 08-18-2009, 09:44 AM
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Touche! Is there an easy way to make the door unstuck? Can I just shove a wire in the vent and poke it? Lol.
Not really. Part of the motor test is to determine if the door is stuck. When you apply power to the motor, if the motor operates but the door doesn't move, the door may be stuck. That is the test where if you apply power incorrectly, you can fry the motor.
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post #10 of 49 Old 08-23-2010, 06:20 PM
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cheaper to replace motor than to diagnose??

rather than bother with the dealership diagnosing the motor it may be cheaper to simply replace it. A diagram of the parts can be found here.

http://www.hondapartsnow.com/online/...=Heater%20Unit

items 7 & 8 are the air mixing valves for the driver and passenger sides respectively. Each Part runs approx 50-75.

Hope this helps
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post #11 of 49 Old 08-24-2010, 02:00 AM Thread Starter
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rather than bother with the dealership diagnosing the motor it may be cheaper to simply replace it. A diagram of the parts can be found here.

http://www.hondapartsnow.com/online/...=Heater%20Unit

items 7 & 8 are the air mixing valves for the driver and passenger sides respectively. Each Part runs approx 50-75.

Hope this helps
Dude, you're f'ing awesome! Way to revive an old thread and great first post! Now if you can answer this question... what would I have to remove to get to that part and replace it? Also, do you think any regular auto A/C and heater repair shops would have the know how to operate on these somewhat technologically advanced dual climate control systems (lol)? I'm tempted to order the part and take it to an auto A/C shop and let them look at it and fix it.

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post #12 of 49 Old 10-08-2010, 10:59 AM
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Hi Everbody here,

Anyone find a solution to this problem? I have a 2007 accord and it is blowing outside air on the driver side, even when temp is set to maximum. The passenger side works fine though (blows warm air). Similarly, when I switch on the AC, the passenger side blows cool air, but the driver side blows ambient air from the outside. I went to the dealer, but they want $99.99 just for the diagnostics. Is there anyway I can do it myself?

Thanks.
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post #13 of 49 Old 10-15-2010, 01:56 PM
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Hi Everbody here,

Anyone find a solution to this problem? I have a 2007 accord and it is blowing outside air on the driver side, even when temp is set to maximum. The passenger side works fine though (blows warm air). Similarly, when I switch on the AC, the passenger side blows cool air, but the driver side blows ambient air from the outside. I went to the dealer, but they want $99.99 just for the diagnostics. Is there anyway I can do it myself?

Thanks.
I just recently had the same problem and I took it to a Honda dealership. They didn't charge me to diagnose it but they did incorrectly replace the mixer motor the first time. Then the 2nd time they replaced the heater core which fixed it once and for all. Honda of America split the cost of the heater core replacement 50/50 with me though so overall the cost to fix was less than it would have been if they got it right the first time.
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post #14 of 49 Old 10-15-2010, 07:50 PM Thread Starter
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Heater core? Ugh. I doubt it's the heater core keeping my driver's side from getting heat. The passenger side heats up like an oven. Perhaps I'll take a look at it next week and see if I can apply power to the driver's blend door motor.

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post #15 of 49 Old 10-25-2010, 10:27 AM
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Originally Posted by blafrisch View Post
I just recently had the same problem and I took it to a Honda dealership. They didn't charge me to diagnose it but they did incorrectly replace the mixer motor the first time. Then the 2nd time they replaced the heater core which fixed it once and for all. Honda of America split the cost of the heater core replacement 50/50 with me though so overall the cost to fix was less than it would have been if they got it right the first time.
blafrisch: thanks for the note. Do you live anywhere in the Baltimore/DC/norther VA area? If so, which dealership did you go to? My local dealer wants 99.99 just to find what's wrong. I do not want to pay that much, when I already know whats wrong (almost). Can you also tell me how much you spent to change the heater core? thanks.
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