[30467659]

Good Morning,

I have a 99 Odyssey with 240K miles. One of the fans was coming on (and staying on) every time the AC kicked on. I would get get cool air on a mild day, but no cool air on a hot day. When the AC kicked on I can feel a momentary "tug" when the van is moving at slow speeds.

I put in a can of AC oil charge and then a can of R134A. While the R134A was going in the fan finally shut off. However it keeps kicking in and then shutting off immediately and the AC air isn't terribly cold as I would expect.

The fan now keeps kicking in for literally a split second, shuts off and then repeats.

Any advice?

Thank you.

 

[blake]

Which fan? The vent fan in the dash?

These automatic systems can stop working if an input in its control loop is not working like a temperature sensor. The part about you charging it makes me wonder if it is under or over charged. You can check by turning the A/C on full on a hot day and watch as the clutch on the compressor engauges. It should cycle somewhere around 30 seconds or more. If it is cycling quickly in a few seconds it is not charged correctly. That would make it feel like a short loss of power followed by a boost as it shuts off.

 

[William Wiles]

Just pumping coolant in without checking pressure is dangerous. You may have it way overcharged which will cause the hesitation when you turn it on. The A/C fan should come on when you turn on the A/C. The other fan should come on when the engine temp gets high. Never put oil in unless you have evidence of oil loss.

 

[30467659]

The charge shows about 50 on the meter at about 75 degrees outside. Should it be less?

Thanks.

 

[William Wiles]

Pressure should be in the range of 25 to 45. When the temperature gets to 90 out the pressure will be higher than the now overcharge at 50.