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Discussion Starter #1
I think I have a problem with my Heater/AC Unit in my 2006 300C. If I have the air conditioning on, it is ice cold. If I turn the temperature up, it stays ice cold until I hit the highest notch, then it turns hot. It's like there is no in between. Please let me know if this is how it is supposed to be. When you have your AC on, and you turn the temperature knobs, does the temperature gradually get warmer until it is hot, or does it stay cold until you hit the last notch?

Thanks
 

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You have to have the controls set on Auto for the temp controls to work the way you want them to. If you do have them on auto, you may need to pay a visit to the dealer for a check up. Even if it is a mistake on your part, your dealer should be very happy to go over the A/C with you and make sure everything is OK and to brief you on the A/C controls.
 

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CubeDog said:
When you have your AC on, and you turn the temperature knobs, does the temperature gradually get warmer until it is hot, or does it stay cold until you hit the last notch?
Yes, in mine (05) it gradually goes from cold to warm as the setting is turned. It works fine in manual mode although the temperature is simply more or less vs. the actual degree setting in the Auto mode.
 

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this is probably my favorite thing about this car i live in Miami and its hot as balls here... The air conditioning on this car is bad ass its freaking ice cold.... i love it
 

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AC is just ok - on the hottest dayz.
Auto controls work fine.
 

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Discussion Starter #7
Mine is either ice cold or blazing hot. It does not adjust gradually. I took it to the dealer and they put a new unit it that is doing the exact same thing. I called and they said that they tried another 300 on the lot with the same behavior. You guys can gradually adjust it with no problem though?
 

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CubeDog said:
Mine is either ice cold or blazing hot. It does not adjust gradually. I took it to the dealer and they put a new unit it that is doing the exact same thing. I called and they said that they tried another 300 on the lot with the same behavior. You guys can gradually adjust it with no problem though?
It sounds like your "blend air doors" are not operating correctly. First, air passes through the A/C evaporator. Next, air bypasses the heater core for maximum cooling, all air goes through heator core for max heating, or any combination as required to attain the correct temp requested. There are two blend doors...this is how the two sides are supposed :rolleyes: to maintain two temperatures. It sounds like your blend air doors are flopping from one extreme to the other with no in between.
 

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Discussion Starter #9
frank29 said:
It sounds like your "blend air doors" are not operating correctly. First, air passes through the A/C evaporator. Next, air bypasses the heater core for maximum cooling, all air goes through heator core for max heating, or any combination as required to attain the correct temp requested. There are two blend doors...this is how the two sides are supposed :rolleyes: to maintain two temperatures. It sounds like your blend air doors are flopping from one extreme to the other with no in between.
Frank,

Thank you so much for your detailed comment. This may help me point the service dept. in the right direction.
 

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The heat works perfectly fine in my car, though the A/C feels like it is thumping when on. It works fine, but I can feel it rumbling in my feet. Anyone else feel this? I can only feel it when stopped. Can't tell while driving!

Chewy
 

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Mind works just fine. I set it between 68 and 72 for both front and back. I have driven through cool and warm to hot climates without having to touch the knobs and the cabin stays comfortable.

I did blast the A/C one time when getting in the car after sitting in the sun to "jump start" the cooling process, but set it back to 72 after I felt comfortable.
 

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I live in a very severe climate.

In the winter, it can go down to minus 40 celcius (-40 F). Last week, we hit plus 33 celcius (99 F) with very high humidity.

I set my cabin temp at 22 degrees celcius (72F). I leave it there all year round. I place the system on full auto - usually with the fan in the Low Auto setting.

My system has worked quite well for a full year now. No problems whatsoever.
 

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Here is my little quirk I kinda don't like but it's very minor and I've noticed it over the past 2 weeks. In the afternoon when I go home from work and it's 90+ degrees I turn the temp all the way down and leave the other knobs on auto. Then once it cools off I turn it back up to 69. The next morning when I leave to go to work and the outside temp is 60 the thing starts cranking out heat because everything is on auto and the temp is set at 69 so it thinks it needs to heat up the car.
 

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Ruppstar said:
Here is my little quirk I kinda don't like but it's very minor and I've noticed it over the past 2 weeks. In the afternoon when I go home from work and it's 90+ degrees I turn the temp all the way down and leave the other knobs on auto. Then once it cools off I turn it back up to 69. The next morning when I leave to go to work and the outside temp is 60 the thing starts cranking out heat because everything is on auto and the temp is set at 69 so it thinks it needs to heat up the car.
Turning the temp down on a hot day in no way speeds up the cooling process. The system will work full tilt to bring it down to your preset usual temp.

Simply move the Auto Fan to Auto Hi for more air movement.
 
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