Engine Size: 2.7
Refrigerant Type: r134a
I have a 2000 toyota tacoma that is having an intermittent ac problem. Sometimes it blows cold, sometimes it doesn't. Clutch always engages with the ac switch. One day it will blow cold and the next day or later that afternoon it will blow outside air temp. It does this from startup not after running a while then freezing. At a loss and it is going to a shop next week but if it is blowing cold when I take it I don't know if they will be able to figure it out. Anyone have any ideas?
When it stops blowing in the cold air have you put in in neutral/park and taken a looksee to see if the compressor is still engaged?
Is the air flow still good out of the vents, or is that diminished?
Clutch is still engaged. One day it works when you first get in and the next day it won't. Sometimes it quits while driving. Airflow from vents doesn't change except the temperature
If you're sure the compressor is turning when it is not cooling, it could be the TXV sticking closed. Pressures would tell.
Another common cause of this is balky variable compressors, but I don't think your truck has one.
Yesterday it did not blow cold and both the high pressure and low pressure lines were warm seemed to be same temp.
Today it blew cold for a while then stopped. Compressor still runs. When it is blowing cold one of the supply lines is cold one hot. When it stops blowing cold both sides are about the same temperature not really hot more like air temp. Shop said it is the AC amplifier so i ordered one and will try it tomorrow. Any other ideas?
I think that was bad advice-- the amplifier only controls engagement of the clutch, which does work. You really need to see the pressures when it is not working. Also you could try banging on the TXV and see if that makes it start working. Hit the side of the valve not the round thing on top.
If the amplifier shuts it down, the a/c light on control head will blink for minutes.2
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
I changed the amplifier and it did not help just like you suggested. Is the txv under the hood or under the dash? Thank you for the help.
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