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I am replacing the expansion valve on a 01 Corolla. I need to disconnect the high and low pressure lines going through the firewall to the evaporator. In order to disconnect them, I need to remove the plastic clamp/connector that joins the lines together at the firewall in the engine...

Based on what you say and assuming the A/C cools for a few minutes when you first turn it on and then stops cooling.....this sounds to me like the expansion valve is failing and needs to be replaced. The expansion valve is mounted to the evaporator and is located under the dash on the passenger...