xf fan switch troubles
hi everyone. I have a xf with a posessed heater fan switch. If the car is sat in the sun and heats up inside and I turn of the fan switch on on the dash, it will work on 1 2 & 3 for about a minute. Then it stutters and cuts out. If I switch it off and on again its the same, fine for a minute then kaput If I turn it to number 4 it works fine.
On cooler days the fan will work on 123 & 4 till the cows come home.
Has to be temperature related but I have no Idea where to look. I have replaced the switch with a new one, no difference. I have also replaced the relay under the dash, no difference.
Are there any other switched or relays anywhere that could cause this.
Thought of a loose wire but this doesnt explain why it only happens on hot days.
If anyone has had this trouble or has any ideas it would be great.