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b5demon
b5demon, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 3718
Experience:  ASE and Chrysler master technician with over 17 years in dealer
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It blows hot air only when car is on, Yes if I turn car off

Customer Question

It blows hot air only when car is on
JA: Have you checked the coolant level? Have you checked the hoses for leaks?
Customer: Yes if I turn car off and just with the key on car not running cold air come threw the vents but as soon as I turn the car on it turn hot
JA: What is the make/model/year of your car?
Customer: 300 Chrysler 2007 2.7
JA: Are you fixing your 300 yourself? What have you tried so far?
Customer: Yes I replace the control and that wasn't the problem
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 26 days ago.
Category: Chrysler
Expert:  b5demon replied 26 days ago.

Hi Welcome to Just Answer! This is a normal condition. The engine must be running in order for the water pump to circulate hot water through the heater core inside the hvac housing and provide heat.

Customer: replied 26 days ago.
I don't want heat in the vent I want it cold it doesn't let ac work just hot air freno level is good too
Customer: replied 26 days ago.
The hole act system is all brand new
Customer: replied 26 days ago.
Ac
Expert:  b5demon replied 26 days ago.

Both the heat and the ac require the engine to be running to operate properly and get the desired temp you want. If you are running the fan in the accessory position all you are going to get is outside air temp or maybe a little higher are lower till the components inside the hvac housing cool off or warm up to outside temp.

Customer: replied 26 days ago.
but with he ac button on it still blows hot it won't change to cold
Customer: replied 26 days ago.
I already check for leaks in the ac
Expert:  b5demon replied 26 days ago.

with the engine running or the engine off?

Customer: replied 26 days ago.
Both with is running it hot but when I turn the car off and with just the key on it blow cooler air but as soon as I turn it on it blows hot and I want it to be cold
Expert:  b5demon replied 26 days ago.

OK sounds like you may have an issue with the blend air door inside the hvac housing that is what is responsible for controlling the temp out of the vents

Customer: replied 26 days ago.
do I need to taredown the hole dash to get to it to replace it
Expert:  b5demon replied 26 days ago.

correct unfortunately the dash needs to come out to access the housing and the blend air door

Customer: replied 26 days ago.
Ok thank u
Expert:  b5demon replied 26 days ago.

no problem always glad to help