In cold weather my climate control heats the cabin for the first hour or so of driving, then it turns cold and remains cold no matter how high I turn the temperature up.

The speed sensor is part of the ABS unit and can't be replaced separately.

i should have posted this 5 years ago, but for anyone having the same problem it did turn out to be the ABS unit, replaced it in 2013 and no problem with the roof since.

Thanks IanL, I think I will just keep an eye on it and wait and see how it is in summer when we get days of 40C.

The radiator was replaced three years ago and the fan does not go to high speed until the temperature reaches 100C and that only happens if I leave the car idling for at least ten minutes, the temperature then returns to 90 and then goes back up to 100 until the fan comes on again, I think that is a...

The timing belt and water pump are less than 2 years old. The temperature cycles with aircon off or on. It is currently winter here in Western Australia, 6 degrees C at nights 17 C during the day.

The temperature reading on the dash was always steady but now it constantly oscillates between 80 and 90.
I have changed the thermostat and the temperature gauge sensor but it still goes up and down once the car warms up.

My roof wont open or close on my 2004 1.6. Took it to my local European car specialist who checked the fault codes for the roof ECU and it says "Speed sensor information fault". Removed the code and the roof worked fine for a day then the code reappeared and the roof stopped working. Remov...