A/C compressor will not engage and blower motor will not shut off?

JOHN GLASS

MEMBER
2006 HONDA PILOT
3.5L
6 CYL
2WD
AUTOMATIC
230,000 MILES

With the engine running and everything off the blower motor is running. When you turn A/C on the compressor won't come on. I bought a low side A/C switch, then recharged the system. A/C compressor won't kick on. Then I bought blower motor relay, and nothing changed. I jumped connector on low side ac switch by putting wire in one side and connected it to a ground, it kicked compressor on but won't kick on when u go from one side to other. Blows cold air when jumped. I guess my next step would be resistor on blower motor huh? Thanks for your help.

1 Reply

STEVE W.

MECHANIC
12,994 POSTS

If the blower motor is running it's not the resistor. It's sounds more like a control issue. You say you replaced the low side switch and can jumper one side to ground and it will turn the compressor on. That at least eliminates the compressor, it's relay and fuses. However because of the design it doesn't tell much about the rest of the system. The pressure switch is normally closed when the system has a charge in it and the pressure isn't high. Jumping it to ground might help isolate which side to look at though. Which wire did you jump, the Red w/orange or the Blue w/red side? The Red goes to the HVAC controls, the Blue goes to the powertrain module.
Do you have the automatic temperature system or manual controls?