4runner ac compressor not engaging. The compressor is driven by an accessory belt. The ac amplifier is what turns on and off the compressor clutch. If you measure resistance from that single terminal to ground you will probably find that the clutch coil is open.
Nevertheless if this does not help it might be because you are using a bad ac compressor clutch. Then look at the front of the compressor clutch. If any one of these components is malfunctioning or broken the ac system will not work.
So i had the blinking ac light issue with my 2006 40l 4runner sr5 and figured i had a bad compressor clutch since it was very rusty. This past weekend i replaced the entire ac compressor as well as the drier and vacuumed the system held near 30 inches of mercury for an hour. Replacement ac parts can be purchased from most auto parts stores.
It should be hot when the ac compressor should be running. So start your diagnosis by determining if the compressor clutch works. The ac switch on the dash switches the compressor on wit.
It would be lucky if the ac could blow cool air and the compressor could engage. If the clutch doesnt engage the air conditioning compressor cant pump refrigerant. Both the pulley and the clutch should be spinning.
Ac compressor not engaging 2005 toyota 4runner ac compressor never engages. Also before you get too fancy make sure the clutch gap isnt so huge the clutch wont engage. If the ac compressor clutch wont engage on your late model toyota and you find a b1479 flow control circuit trouble code stored the problem is usually a bad flow control sensor.
But before you start replacing parts you should troubleshoot your toyota 4runners ac. So if this wire is hot and the compressor still doesnt engage then the problem is the black yellow wire that goes to the compressor. The main problem is possibly due to a pressure switch or faulty relay.
While jumping power to that wire try helping the clutch by pushing it towards the pulley. If your air conditioning compressor isnt working the clutch wont engage then watch this video.
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