Such gurgling is normal in the AC system as the charge becomes low. In winter weather like now, you're probably using the defrost setting which tries to activate the AC compressor as long as there is a minimal amount of refrigerant to trigger the low pressure pressostat. The gurgling you're hearing is likely in the evaporator core next to the heater core. Disconnect the AC compressor at the drier connector and I'm fairly confident your gurgling will go away.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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