2003 Tahoe, RPMs jump from 600 to 800 every 8 seconds and AC clutch spins when climate controls are turned on.

76Nick · Nov 7, 2024

So I am having a weird issue with my 2003 Tahoe Z71. At idle when I turn on the climate controls (even with the AC off) the AC compressor clutch spins for a couple seconds and the RPM's jump from 600 to 800. Then the clutch stops and the RPM's go back to 600. This happens about every 8 or so seconds. I am showing no codes at all except for a catalyst code which I've had for a while. Anyone have any idea what could be causing this?

rockola1971 · Nov 7, 2024

Try disconnecting plug at compressor and see if the RPM problem goes away. If so then I suspect you have a shorted (melted together clutch coil). Have automatic or manual hvac controls? Auto has the digital temp readout for driver and passenger settings.

76Nick · Nov 7, 2024

rockola1971 said:
Try disconnecting plug at compressor and see if the RPM problem goes away. If so then I suspect you have a shorted (melted together clutch coil). Have automatic or manual hvac controls? Auto has the digital temp readout for driver and passenger settings.

I'll give that a shot thanks. I have the auto hvac controls...do you think the controls may have something to do with it?

justirv · Nov 7, 2024

76Nick said:
I'll give that a shot thanks. I have the auto hvac controls...do you think the controls may have something to do with it?

There is a chance that the controls are the source of the problem. As @76Nick says, start at the compressor and work your way backwards. I suspect that your refrigerant level may be low, and what you are seeing is constant A/C (clutch) engagement, with low-pressure (refrigerant) cycling.

2003 Tahoe, RPMs jump from 600 to 800 every 8 seconds and AC clutch spins when climate controls are turned on.

76Nick

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