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Fan will run with heater, not with AC - Heating & Cooling

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Is the wire at the thermostat connected to the "G" terminal? The fan in the heating mode is controled by the furnace and in the cooling mode, the "G" terminal on the thermostat hooks up to the "G" terminal on the furnace and starts the blower.
Please rate me and contact me back with any other questions that you may have.
Sincerely,
Paul Gibson

Posted on May 03, 2010

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Posted on Jan 02, 2017

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Ok when I have my heat fan on my 2006 dodge charger 2.17 it dont run hot but when I turn it off it do our when I turn on the ac it run hot


If the engine is running hot you may be low on coolant. Check this first. If coolant level ok, the rad fan may not be working to cool the engine. If the AC is operational, when you turn it on, the radiator fan should come on telling you the fan motor is ok. You still may have an issue with a fan control related to temperature. This can be caused by a fan relay/wiring/temp sensor/ecm. Make sure the thermostat is functioning properly as well

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When you turn the A/C on does the elect. fan suppose to come on evenin cold weather and whitch temp. switch runs it?


Normally the ac fan (in front of the condenser) will run as soon as the ac is switched on. This condenser gets hot when the gas is being compressed and needs to have the heat removed for the system to work IT will switch on regardless of the ambient temperature as it is connected directly to the ac compressor clutch. IF you are referring to the heater fan inside then it will only work with the heater fan on or with both ac and heater on but will not always work with just the ac on.

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FUSE BOX DETAILS


left to right...
1. empty
2. e flashers
3.horn, brake lights
4.clock, trunk light, inside light, radio
5. rad. cooling fan relay (AC only)
6. right side running lights
7. left side running lights
8. right high beam and indicator
9. left high beam and indicator
10. right low beam
11. left low beam
12. reverse,turn signal and inst panel
13. main and transfer fuel pumps, auxiliary air reg., ox sensor heater
14. license plate and glove box light
15. wipers
16. rear defogger
17. heater blower (no AC)
18. cig lighter
19. rad cooling fan (no AC)
20. Heater blower (AC)
21. rad cooling fan (AC only)
22. empty
23. Ox sensor, idle stabilizer,seat belt warning relay, (Digifant only, control unit, idle boost control, idle boost valve)
24. inst panel lights, heater control lights
25. reading lamps
26. empty
27. empty
28. empty

Hope this helps...;-)

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1 Answer

Heater/AC fan


blower motor resistor is the most probable cause of this i would go to the dealer after market part for this will leave you upset and you will just wind up at the dealer anyway

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