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2004 Suzuki Aerio, Blows cool air out of passenger vents…

Customer Question
2004 Suzuki Aerio, Mechanic's...

2004 Suzuki Aerio,

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

Blows cool air out of passenger vents when heat is on....blows nice heat out of driver side vents.

Mechanic's Assistant: Have you checked the coolant level? Have you checked for a leak in the radiator?

Yes, cooling system is intact

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

I am a mechanic with equipment and tools..... thats about it. ok

Submitted: 4 months ago.Category: Car
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Answered in 4 hours by:
3/14/2018
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 24,073
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

There are few things that could be going on depending on how the vehicle is equipped. Either way the problem could be with the heater core, or if it's a dual zone system then the blend door on the right side may not be moving for whatever reason.

Do you have a dual or single zone system?

Is temperature between sides even with a/c?

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Customer reply replied 4 months ago
I assume it is a single zone, I only see one set of controls, i did top it of with coolant and was about to due a pressure test.
My first reaction was maybe a stuck vent door or something,
Customer reply replied 4 months ago
Ok, i have ac on and am still getting warm air flow out of driver side and cool out of passenger side
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

Does temperature change at all on the right side?

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Customer reply replied 4 months ago
Not that I can feel... i can use temp gun if u like
Customer reply replied 4 months ago
When i was running it earlier i thought i felt boiling in the upper radiator hose and only luke warm on lower hose... stuck thermostat? No temp light.
Customer reply replied 4 months ago
By temp gun I meant infrared therm meter.. sorry
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

It sounds as if you still have air in the cooling system. Make sure it's full and bleed it, see if that changes anything.

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Customer reply replied 4 months ago
Sorry for the late reply....
So yes, I have pressure tested the coolng system, installed a new water pump, new thermostat, back flushed the heater core, back flushed the radiator, back flushed the by pass pipe, hooked up the system and back flushed the system as a whole. Refilled the system with an automatic refill and bleeder. With heater on still blows hot on driver side vents and cool on passenger side vents. With a/c on blows hot on drivers side vents and cold on passenger side.
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

How was the system bled?

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Customer reply replied 4 months ago
I used a funnel kit with a radiator cap adaptor which is supposed to keep out air pockets, I ran the vehicle at 2500 rpm for about 6 minutes.
Customer reply replied 4 months ago
Is there a better way to bleed all the air out?
Customer reply replied 4 months ago
I guess i don't understand why half the vents would be hot and half the vents would be cold lol... but lets make sure i bleed it correctly ��
Customer reply replied 4 months ago
What do u suggest
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

Six minutes may not have been long enough, especially if working outside. The engine needs to reach operating temperature and the thermostat open, draw in cold coolant from the radiator and close again, open again; only once the engine is staying at full operating temperature and no more air comes out can the cap be installed. This may take twenty minutes of running.

If you have a single zone system and there is a temperature difference between sides it is due to air in the heater core or coolant flow through the heater core is restricted.

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Customer reply replied 4 months ago
Ok
Customer reply replied 4 months ago
Ok, i will try again...
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

Ok.

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Customer reply replied 4 months ago
What would you suggest for best bleeding technique ?... cap off...raise front of vehicle... raise rpms?
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

A bleed funnel should be installed and the engine ran for at least twenty minutes, more if necessary. RPM's may need to be raised periodically to force air out of the heater core, etc.

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Customer reply replied 4 months ago
Ok... i will try again
Auto Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago

Ok.

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