AC is not blowing cold air?

Tiny
UKDANNY1
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With the hot/cold control turned fully off (most cold) position, I still get some warm air flow. In hot weather, with the a/c on it is just enough to overcome the warm air and turn it cool. Can you advise what the problem might be please?
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Thursday, December 17th, 2020 AT 11:57 AM (Merged)
Tiny
BRUCE HUNT
  • MECHANIC
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There is a plenum on the vehicle and the door is not closing all the way to shut off the heat. If there is not a plenum, it is the vacuum, motor or cable that is no fully closing the heater valve.
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Thursday, December 17th, 2020 AT 11:57 AM (Merged)
Tiny
LOSONE
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Bruce is generically correct however.

If you want to enjoy a comfortable and cool ride during summer then switch off the heater. On the other hand, heating system in the vehicle keep you warm during winters. In order to attain proper functioning of heater control, you must know the procedure of its maintenance. Although, it sounds simple, yet you must examine it closely.

Coolant plays is the key component of both the cooling system and heating system of vehicle. If engine gets over heated then engine parts will be damaged. Circulation of coolant through engine passageways cools down the engine. Later, it passes to the heater core.

Flow of hot engine coolant through heater core is controlled by a device known as heater control valve. In order to regulate the flow, it is positioned in one of the heater hoses. Thus, it helps in controlling the heater output.

The lever of heater control is connected with cable that runs up to the control valve. This control valve is placed at the top of heater box. When the lever moves, cable will also move. This leads to the opening of valve. During the closed position, the lever of heater control locks in a positive detent at the control, along with operating valve. You can also observe the working of heater control by closing off the heat. You will found a folded cable. Thus, water valve is unable to close completely.

You must clean the heater control periodically. This includes cleaning and greasing of control valve and lever of heater control. Such periodic cleaning will enhance the life and efficiency of heater control. If the heater control of vehicle is completely worn out then replace it immediately. Driving vehicle with a worn out heater control would be torturous. Moreover, it would also affect the performance and efficiency of vehicle. You must take adequate care and research while buying a new heater control.

God Luck and let me know Losone
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Thursday, December 17th, 2020 AT 11:57 AM (Merged)
Tiny
KLANGUELL
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I tried looking for the reason my ac is not working can you help me?
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Thursday, December 17th, 2020 AT 11:57 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
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Hi klanguell,

By removing the fuse, definitely the blower would not work.

Did you check if the compressor and fan motors were working when AC is turned on?
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Thursday, December 17th, 2020 AT 11:57 AM (Merged)
Tiny
LOPEZSEAN
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Hello,
have had A/C problems since 80,000 miles. My problem is with the air conditioning system. I just recently had the system recharged with refigerant only to find out two days later that the system was blowing hot air. So, I went back to the shop to have some dye placed in to check for leaks, used the system for a couple days, and again was subjected to the system blowing hot air. I brought the car in to have it checked, no dye or signs of leakage were found. Doesn't make sense to me. According to my mechanic, the compressor and condenser were working. I even had the evaporator core checked as that was a questionable problem, and no additional leaks nor was the core needing replacement. My mechanic does not know what the problem is.

So to sum things up, the system works after refigerant has been added for a day or so, then after that, no more cold air gets blown through the vents when the A/C is on. Any ideas? Anyone? Summer is here, and I’m in desperate need of cold air! Thank you.
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
LOSONE
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Refrigerant doesn't leak without a hole in the system. Your Honda is prone to having a bad evaperator. If you can't see a leak outside, 90% chance it's the evaporator.
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
LOPEZSEAN
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But if the evaporator is bad, then no cold air would come through the vents after a recharge, correct?

Anyhow, thanks for the quick reply. Had the evaporator checked, and my mechanic said it looked like new! Okay, so had the system recharged (again), had the compressor cleaned up (had a bunch of buildup), and had extra dye placed in. It is now day one after the recharge, and the system is blowing cold air. I'm keeping my fingers crossed :wink:

thanks losone!
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
LOSONE
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Most A/C leaks are from a tiny hole that expands under pressure. It would still cool if the hole is in the evaperator. I think your problem is going to be the compressor. The reason for the build up is refrigerant oil leaking from the system. Probably a front seal. Good luck
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
JVRIPLEY
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Have the mechanic check for intermittent electrical shorts. My brother had this problem on his 94 civic 4 door. He took it in many times and the mechanic could not figure it out. This was a problem with some electrical short that would show up intermittently. It caused the air conditioner to start blowing out regular air, ie non air-conditioned. Problem was it would show up only when the inside of the car warmed up and caused some part of the plastic dash to warp just a bit.
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
LOSONE
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More than likely it is not a "short." They burn wires and blow fuses. It is probably an intermittant open circuit that causes the problem.

Check your E mail for a schematic. Often the thermo switch causes problems.
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)
Tiny
MACAT
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Check ground connection at battery terminal maybe incomplete circuit

GOOD LUCK
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Thursday, December 17th, 2020 AT 11:58 AM (Merged)

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