Ive just replaced the thermostat again because its not going over 60 degrees and then going back down when driving. Now ive replaced it under warranty and bled it for good 20 minutes. What I dont understand is that its bang on 90 degrees on the cluster however if I go and touch the coolant its ice cold however the heater matrix pipes are blazing hot. So im thinking its a faulty thermostat? What you guys think?