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When I turn on ac car heats but cools down while driving, It…

Customer Question
When I turn on...

When I turn on ac car heats but cools down while driving

Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses?

It over heated and coolant over flowed from the other coolant compartment no leakstho

Mechanic's Assistant: What is the make/model/year of your car?

Nissan 350z 2004

Mechanic's Assistant: Are you fixing your 350Z yourself? What have you tried so far?

Nothing I'm trying to figure it out now the thermostat was just changed Could it have a air pocket

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

It heated while parked and went down while driving with ac off

Submitted: 8 months ago.Category: Nissan
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Customer reply replied 8 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 8 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 8 months ago
When will they reply
Answered in 5 minutes by:
8/2/2017
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 4,366
Experience: Experienced automotive repair technician, Pulaski Tech graduate and DSM hobbyist.
Verified
Hey there, thanks for the question.
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Customer reply replied 8 months ago
Welcome
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
Generally when you see an overheating issue when idling its an airflow issud or a lack of coolant circulation from an air pocket.
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Customer reply replied 8 months ago
I'm not by the vehicle
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
if it was an air pocket, you would likely be able to get it to cool the engine reving it at idle though.
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Customer reply replied 8 months ago
When I'm driving it cools down only when I stop it hests
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
Then its most likely the fans. If both fans dont run with the engine warmed up and the AC on, then you have a fan issue.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
You can test the fans by running the auto active test on the IPDM.
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Customer reply replied 8 months ago
How do I do that
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
Let me get you the procedure, one moment.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
DIAGNOSIS SYSTEM (IPDM E/R)Diagnosis DescriptionAUTO ACTIVE TESTDescription
In auto active test mode, the IPDM E/R sends a drive signal to the following systems to check their operation.
Oil pressure warning lamp
Front wiper (LO, HI)
Parking lamps
License plate lamps
Tail lamps
Front fog lamps (if equipped)
Headlamps (LO, HI)
A/C compressor (magnet clutch)
Cooling fans
Operation Procedure
Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper operation)
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
Turn ignition switch OFF.
Turn the ignition switch ON, and within 20 seconds, press the front door switch LH 10 times. Then turn the ignition switch OFF.
CAUTION:
Close front door RH.
Turn the ignition switch ON within 10 seconds. After that the horn sounds once and the auto active test starts.
The oil pressure warning lamp starts blinking when the auto active test starts.
After a series of the following operations is repeated 3 times, auto active test is completed.
NOTE:
When auto active test mode has to be cancelled halfway through test, turn ignition switch OFF.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
The door switch is the door ajar switch.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
In the door jamb
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Customer reply replied 8 months ago
How do I know results
Customer reply replied 8 months ago
Could dude be out the car has been parked for a while
Customer reply replied 8 months ago
Fuse
Customer reply replied 8 months ago
I was thinking maybe a fuse is out because ac blows warm until I drive also
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
if the auto active test kicks on the fans it will rule out any possible fuse issue.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
The ac will blow warm with no fan operation because the condensor is not cool. so very likely the fan at this point
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Customer reply replied 8 months ago
Where would the fuse be
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
In the IPDM under the hood
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
I just double checked the service manual. on this year the fusible linksfor the fan are in the little fusible libk box in front of the IPDM by passengers side firewall behind battery.
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Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
They are both 40a links
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Customer reply replied 8 months ago
I will check it out
Nissan Mechanic: Jake, Nissan Technician replied 8 months ago
K, let me kow if you need anything else please.
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Category: Nissan
Satisfied Customers: 4,366
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Experience: Experienced automotive repair technician, Pulaski Tech graduate and DSM hobbyist.

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