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Discussion Starter · #1 ·
2009 Honda Pilot - it's summer time and my AC isn't blowing cold on the driver's side. I've checked the following and they seem to be okay:

  • AC relay in the main fuse box under the hood (tested with multimeter)
  • AC refrigerant level, it shows about halfway in the green area on the gauge (off the shelf can of refrigerant with gauge). The instructions say not to add any if in the green, although I'm questioning that.
  • Blend door controller - I removed it so I could see the actuator arm and adjusted the temps and verified that it moves. I also manually closed the door.
None of the above seems to help. Is there anything else to check?

Thanks, Joe
 

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Glorificatus Oleum Mutante
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2009 Honda Pilot - it's summer time and my AC isn't blowing cold on the driver's side. I've checked the following and they seem to be okay:

  • AC relay in the main fuse box under the hood (tested with multimeter)
  • AC refrigerant level, it shows about halfway in the green area on the gauge (off the shelf can of refrigerant with gauge). The instructions say not to add any if in the green, although I'm questioning that.
  • Blend door controller - I removed it so I could see the actuator arm and adjusted the temps and verified that it moves. I also manually closed the door.
None of the above seems to help. Is there anything else to check?

Thanks, Joe
You checked both left and right blend door actuators?
 
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Discussion Starter · #3 ·
Thanks for the reply. I just checked the left blend door (driver's side) since that's the one blowing hot. Should I check the right side too?
 

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Glorificatus Oleum Mutante
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Thanks for the reply. I just checked the left blend door (driver's side) since that's the one blowing hot. Should I check the right side too?
You only need to check which ever sides is not changing the temperature for you. The concern was if you didn't know there was 2. Checking just one side for the opposite sides problem.
 
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2009 Honda Pilot - it's summer time and my AC isn't blowing cold on the driver's side. I've checked the following and they seem to be okay:

  • AC relay in the main fuse box under the hood (tested with multimeter)
  • AC refrigerant level, it shows about halfway in the green area on the gauge (off the shelf can of refrigerant with gauge). The instructions say not to add any if in the green, although I'm questioning that.
  • Blend door controller - I removed it so I could see the actuator arm and adjusted the temps and verified that it moves. I also manually closed the door.
None of the above seems to help. Is there anything else to check?

Thanks, Joe
I'm with SLVR7 on this one. The same thing was happening with my 2011EX-L last year. (bought this Pilot in Sept of 2018) The refrigerant was a bit low and it also turned out that there was an "air bubble" or some sort of anomaly in the system. This may have been caused by previous owner topping off low refrigerant with a DIY can. After evacuating and refilling the system it was fine and has been since.
 

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2009 Honda Pilot - it's summer time and my AC isn't blowing cold on the driver's side. I've checked the following and they seem to be okay:

  • AC relay in the main fuse box under the hood (tested with multimeter)
  • AC refrigerant level, it shows about halfway in the green area on the gauge (off the shelf can of refrigerant with gauge). The instructions say not to add any if in the green, although I'm questioning that.
  • Blend door controller - I removed it so I could see the actuator arm and adjusted the temps and verified that it moves. I also manually closed the door.
None of the above seems to help. Is there anything else to check?

Thanks, Joe
Same problem.Refilled the gas and it worked fine for a few days than the problem resurfaced. Took the car to the AC mechanic and he has asked to change AC compressor clutch and expansion valve.
 

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I'm having the Same issue, Warm on the Drivers side only, the Passengers and back seat are plenty cold. The same compressor services everything, so it has to be a blend door or something else allowing warm air to mix on the driver's side.
 

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I just fixed this issue in my 09 Pilot using the video below (showing a '13 with warm driver AC). I added a can of refrigerant and AC blows cold on all vents now. I'd recommend a recharge can with a gauge (as shown) so you can prevent over-filling. Just follow the video to identify the low pressure valve (larger pipe, cap marked with L) in the rear left of engine bay, and follow instructions on the can.

How to fix the issue:

Why the driver side is warm with low refrigerant:
 

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NEVER ADD LEAK SEALANT TO A HONDA, it likes to plug your evap, condenser, and expansion valve.
I have removed that from my post so someone does not get confused and buy a can of concentrated leak sealant. Keep in mind that most recharge kits (like that shown in the video) contain some sealant and have a lot more successful reviews than failures. Just be careful to not over-fill, and if you are not comfortable working under the hood, or with some small risks, then pay a pro to charge your system. The point is, low refrigerant is the likely cause

Another option is to buy a recharge hose/gauge, and use a can of R134a with no leak sealant:


 
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