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Ka aircon seems to go reverse (reverse cycle) when turned off and on (like when stalled) or a short stop at a shop. The heat that comes out is over 50deg c even if the car is cold. Anyone experienced this or know what is wrong? An aircon mechanic reckoned it cant happen because of a one way...

7-15v divergence is still a 12v difference , your voltmeter is out by 7v. As you have a 12v battery I suggest the Ka's real voltage is only 12v. My cleaning of the piston originally, resulted in a small water leak which caused clogging of the piston again, hence the new unit was purchased an...

Voltages ok then suggest you get a brand new solenoid heater switch from ebay. I got mine for about $25 and now works a treat. Installation is tricky because of the confined space but you must be very careful not to pull hard or push laterally on the hoses where they enter the heater core pipes...

Just finished fixing my heater tap. Was stuck on about 2 thru summer and winter now fast approaching. The 'tap' is located behind plastic bulkhead just under windscreen center. The 'tap' is not cable operated like most old cars but electronic. It uses a variable solenoid to pull the hot water...