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"Both" what heat up? Both heated seats? If so, the heated seats are heated using electrical current. The cabin heat from the vents is heated from engine coolant. The car will need to be running several minutes before heat will start blowing from the vents. If once the engine temperature gauge gets up to normal you still are not getting heat from the vents and are certain you have the climate control settings correct to be requesting heat, you probably either have a blend door issue or an issue with the valve that allows coolant to circulate through the heater core. I'm assuming that your blower motor is working and you can feel air flow, just the air flow is not warm. If you are not getting air flow, then the blower speed controller may have failed, the blower motor may have failed, or some other issue is preventing power from getting to the blower motor.
I have a 2000 pontiac grand prix with a digital climate control system.
The heat quit working, it doesn't blow out any heat. Now that it is warm
outside the air stopped blowing out any air. The digital temperature on
the climate control is not correct. When it states that it is below 30
degrees on the ext and it is warm outside the air wont be cold. Once it
starts going above 30 degrees the air gets colder. Today the blower stop
working all together. Was told it maybe the climate control unit was
bad. You can hear the door opening/shutting when you switch the temp
from cold to hot. But there was no heat blowing out whatsoever in the
winter time. Could you please give me your opinion on whether or not it
is the climate control unit or something else?
There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.
You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.
If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake
and other pedals on the Driver's Side. Close the VENT and that will
stop the Air from coming in and leave the A/C Blowing through the
I also read this online if you have an electronic climate control. "On
climate control press off and heat button and let go quickly. Then
press automatic. The display will start rotating eventually displaying a
code 025,125 , 024 etc. Then press defrost to stop. You may hear blend
door operating atb that time. It worked for my climate control."
if you are sure that your heater core is not restricted. then try to recalibrate the climate control panel. if your a/c system is not working then DO NOT ATTEMPT THE RECALIBRATION it will make your lights on climate control panel flash codes forever.
to reclaibrate the climate control panel just have the engine running. turn the mode to vent, the temp to cold, the blower on high, then press and hold the rear wiper wash and wiper buttons at the same time until the panel lights up then wait about 2 minutes for it to run completly when completed. turn off ignition and then restart the engine try to se if you have heat again. if it doesntwork post the codes it gives you after the calibration test.