I have diagnosed my A/C problem to this... I replaced the Klima relay, wasn't the issue. Anyone need a used Klima relay, let me know. I have narrowed my problem to this... I can get the A/C to engage at a RPM of over 1000 and keep it going, turning it off and on with the PBR. But as soon as I drive off and the idle drops, within a couple miles, the A/C kicks off. I have to turn the MB off and restart and now the A/C will work at over 1ooo RPM. Any thoughts? Is there such a relay, idle speed control?