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post #1 of 17 (permalink) Old 02-14-2011, 06:11 AM Thread Starter
 
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Heater cycles from hot to cold

Any one have this problem... I'll be driving along in the smart with the heater on and all of a sudden the heater will start blowing cold. If I move the temp control down then back up it will get warm again. A little while later it will do the same thing. Is this a heater problem? a switch problem? any idea how to fix it cause it's kind of annoying.
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post #2 of 17 (permalink) Old 02-14-2011, 07:00 AM
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Defrost? The A/C will come on for it, to dry the air...
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post #3 of 17 (permalink) Old 02-14-2011, 10:29 AM
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Originally Posted by ADilwicius View Post
Any one have this problem... I'll be driving along in the smart with the heater on and all of a sudden the heater will start blowing cold. If I move the temp control down then back up it will get warm again. A little while later it will do the same thing. Is this a heater problem? a switch problem? any idea how to fix it cause it's kind of annoying.
More than likely your climate control system is functioning the way it was designed to. It has "auto" temperature control, meaning that if the temp gets a little too hot it will cool you off, then if it gets too cool it will warm back up. Try turning the A/C button OFF and utilizing the vent air.

If that doesn't solve your problem, you may want to bring your car in for an inspection at your service dept.
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post #4 of 17 (permalink) Old 02-14-2011, 10:45 AM
 
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Mine did the samething this morning! I drove it around town with the heat on and then went into a store..only for a minute. When I started her back up, she was blowing cold air!.....not good when its 30 deg. outside! I moved the vent selector nob around to the front vents and it started blowing hot air again! I don't know what moving the vent selector nob around did.....but it worked! I didn't touch the temp. control at all
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post #5 of 17 (permalink) Old 02-14-2011, 10:57 AM
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When the Air Distribution Selector is at Noon Air Distribution Selector.jpg the A/C will come on even if the A/C light doesn't show that it is...
Refer to the (older) Owner's Manual, page 152-4 or thereabout.
Quote:
Do not turn the air distribution control permanently to (the Noon) position. The air condition switches on independently of other settings. The indicator lamp on switch 2 then does not come on.
The vehicle’s fuel consumption increases and the driving performance may be influenced.

Last edited by JPaul; 02-14-2011 at 05:22 PM. Reason: added quote
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post #6 of 17 (permalink) Old 02-14-2011, 11:31 AM
 
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When the Air Distribution Selector is at Noon Attachment 2512 the A/C will come on even if the A/C light doesn't show that it is...
Refer to the Owner's Manual, page 152-4 or thereabout.
Mine was set between the noon (defrost) and the floor which is where I usually have it when it went cold after the restart.
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post #7 of 17 (permalink) Old 02-14-2011, 11:49 AM
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Mine was set between the noon (defrost) and the floor which is where I usually have it when it went cold after the restart.
A/C automatically cycles on and off in order to adequately defrost the windshield and side windows. Leaving the vent selector 100% in the face or feet mode is when it will cycle strictly warm or cold air when the a/c button is off. If the a/c button is on, it will cycle warm/cool automatically according to the temperature, and if it's a Pure there is a sort of auto program that is predetermined not being based on the actual temperature inside the car.

There is some intelligence with the climate control systems.
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post #8 of 17 (permalink) Old 02-14-2011, 12:13 PM
 
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In my instance, the AC button was not pressed. I will see if this is a one time thing ,or it needs a visit to the dealer.
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post #9 of 17 (permalink) Old 02-14-2011, 12:42 PM
 
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Originally Posted by JPaul View Post
When the Air Distribution Selector is at Noon Attachment 2512 the A/C will come on even if the A/C light doesn't show that it is...
Refer to the Owner's Manual, page 152-4 or thereabout.
Quote:
Do not turn the air distribution control permanently to (the Noon) position. The air condition switches on independently of other settings. The indicator lamp on switch 2 then does not come on.
The vehicle’s fuel consumption increases and the driving performance may be influenced.
This does not appear in the Operator's Manual for the 2009 model, part no. 451 584 12 82, Edition B 2009. Perhaps this feature only applies to 2008s.
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post #10 of 17 (permalink) Old 02-14-2011, 12:47 PM
 
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Originally Posted by quirky1 View Post
This does not appear in the Operator's Manual for the 2009 model, part no. 451 584 12 82, Edition B 2009. Perhaps this feature only applies to 2008s.

I don't know about that !!

You are correct that it's not in the 09 owner's manual, but when I put MY 09 in the 12 o'clock position, I can definitely FEEL the engine working harder as the compressor kicks in

Last edited by chieftmc; 02-14-2011 at 01:01 PM.
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