I have read the other replies and have not seen this tactic suggested.
Heat the car up inside until it is toasty. Then turn on the A/C and place the ECC on "RECIRC", which should exclude the introduction of outside air. If the compressor clutch remains engaged and you feel cold air, it is probably being produced by the A/C.
Let us know what works.
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Dave in Virginia; 1998 V70 T5(M): IPD MOTRONIC+ ECU Upgrade, Sport Muffler, IPD Strut Tower Brace; VDO Boost Gauge, IPD Anti-Sway Bars, Rocha ABS Control Unit, Koni FDS Struts and Shocks/// 1988 245 DL Wagon// 1967 MGB Roadster
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