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Re: Marbles rolling around in the front of the engine????
Glad to see you isolated the problem.
In every brand car and truck I have ever driven the AC always kicks in when the defrost is turned on, but the amount it cycles depends on the temperature setting of the dash knob. It will try to keep the temperature you set the knob for. In the newer vehicles it is an electric thermostat, not a cable controlling the heater hose valve. The more you keep the knob on the heat side the less the AC will kick in.
Like JOULES said I'm pretty sure its purpose is to remove moisture - for example in the summer when it's raining, the defroster with the AC running will evaporate the fog quicker than with the knob pointed toward the heat side. Who want it to blow warm air in the summer?
If you can't fix it soon, you can disconnect the wire to the fan clutch to keep it from kicking in temporarily.
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1999 Blazer LS 1994 Chevy G30 Van
WHY IS THERE NEVER ENOUGH TIME TO DO IT RIGHT,
BUT ALWAYS ENOUGH TIME TO DO IT OVER?
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