Heater not running hot, any ideas?

[Mark S]

could be servo motor that opens that flap that directs air passed heater matrix.

[MG ZS STE]

Running the diagnostic would eliminate any servo issues. Is it hold the auto when turning the key starts the cycle?

[Skillen]

Originally Posted by Mark S

could be servo motor that opens that flap that directs air passed heater matrix.

Would the test mode see that?
I can't remember now if it would.

[MG ZS STE]

I'm sure it tests all the servos. You can hear them whirring away as it goes through the cycle.

[petet16]

For the self test, keep the auto button pressed and switch ignition to position 2.

The links and servos can be accessed from the drivers footwell, they're fixed to the side of the heater box so you should be able to see them moving as you change the temp setting and also as you change the direction of the air between screen and foot wells.

[talkingcars]

Pleased to help, glad it's sorted.