A/C fan not working properly

RUDYPAK

MEMBER
2005 TOYOTA SIENNA
3.3L
6 CYL
2WD
AUTOMATIC
222,000 MILES

With the climate control in auto and once the cabin reaches cabin temperature setting should the compressor clutch then begin to cycle on and off?
Mine stays on at whatever temperature I set. The only thing that changed other than it becomes hot or colder in the cabin is the speed of the fan.
The gauges reading for refrigerant are within proper charge range.

7 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

What are the high and low side readings while the compressor is running?

No, it does not need to cycle if the system is working properly.

https://www.2carpros.com/articles/how-a-car-air-conditioner-works

Roy

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Saturday, August 1st, 2020 AT 3:07 PM

RUDYPAK

MEMBER
42 POSTS

Here is a picture. I just noticed that it starts the noise after the whole system is warmed up.
The van had been sitting over night parked. After about 5-10 minutes of driving I then noticed the noise when accelerating from a stop or coming to a stop. Once I am driving I would say 30-35 mph you can hardly hear it if at all.
Ambient temperature was at about 85 Fahrenheit.
This is a reconditioned compressor that was installed if that makes a difference.

I would like to add that I have a bad blend gate. It's the one that controls where the aid blows from. The one that is defrost, face, floor combination.

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Saturday, August 1st, 2020 AT 3:30 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, thanks.

The pressures are high for the temperature.

The low side should be 25-30 pounds rock solid. The high side should be 2 times ambient plus 15%.

How much Freon did you add?

How long did you vacuum the system?

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Did you replace the dryer?

This could be overcharged and if it is not, it could be air in the system or a bad expansion valve.

https://www.2carpros.com/articles/replace-blend-door-motor

Roy

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Saturday, August 1st, 2020 AT 3:42 PM

RUDYPAK

MEMBER
42 POSTS

I vacuumed the system over 90 minutes.I didn't change the dryer. Does this system have 2 expansion valves? It has a dual climate control for the front and rear. The system according to the sticker under the hood reads between 1.65 to 1.91 lbs I put in around 1.7 lbs.
Correction on the ambient temperature. It was about 92 degrees not 85.

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Saturday, August 1st, 2020 AT 6:00 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, if the system is opened, the dryer is required to be changed. With this heat and humidity, it gets contaminated as soon as the system is opened.

There is only one expansion valve. It is mounted on the evaporator core under the dash. The dash has to come out to gain access to the valve. It pays 6.5 hours to replace it.

I attached a YouTube video of the replacement without removing the dash. I tried this and was successful.

https://www.youtube.com/watch?v=GemLsZuQeWc

Roy

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