How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask b5demon Your Own Question
b5demon, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 3726
Experience:  ASE and Chrysler master technician with over 17 years in dealer
Type Your Chrysler Question Here...
b5demon is online now
A new question is answered every 9 seconds

It blows hot air only when car is on. If I turn car off and

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: 10 months ago.
Category: Chrysler
Expert:  b5demon replied 10 months 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 10 months 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 10 months ago.
The hole act system is all brand new
Customer: replied 10 months ago.
Expert:  b5demon replied 10 months 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 10 months ago.
but with he ac button on it still blows hot it won't change to cold
Customer: replied 10 months ago.
I already check for leaks in the ac
Expert:  b5demon replied 10 months ago.

with the engine running or the engine off?

Customer: replied 10 months 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 10 months 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 10 months ago.
do I need to taredown the hole dash to get to it to replace it
Expert:  b5demon replied 10 months ago.

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

Customer: replied 10 months ago.
Ok thank u
Expert:  b5demon replied 10 months ago.

no problem always glad to help