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Low coolant level in engine will result in no coolant reaching interior heat exchanger. Otherwise, check environmental controls. Feel heater hoses under hood to see if they get warm when engine is warm. Could be control valve is not being opened to allow hot coolant into interior heat exchanger.
hi, you say there is no HEAT coming out when blower is on .. is air being blown out of the vents? .. if YES, cold air, then the problem may be an air lock/ a valve stuck closed/ or low coolant .. could be a problem with the air conditioning controls. If NO AIR blowing out of the vents and you can hear the fan blowing then investigate, controls to open and close vents, or possibly disconnected ducting .. if the car has been stood a long time it could be sticking vent/door/flap .. search internet for diagram of heating system for more information.
Any performance testing re auto A/C requires consistant engine revs highway revs eg 1800 exit ramp eg idle stop start 800revs leading to much reduced A/C compressor speed and therefore performance output .Also all testing its desirable to close the bonnet to control design air flow through the engine bay .Also check under dash passenger side air flow pos a filter on return air duct or something sucked up into paper etc .good luck!
I don't have a solution but my old 2004 X-type has that problem when the outdoor temp hits bast 85 degrees or so. Will be interested in any fixes... I've had the outdoor thermometer changed and freon refilled, etc. but having the same issue...
your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps