Shaz425

This might be a few years later reply but I have Audi a3 8v and the car still drives perfect. Coolant temperature stuck at 90 and not loosing any heat so it couldn’t be thermostat. If the thermostat was blocked car will over heat, if it was open stat the car temperature will fluctuate and will give heat when driving. The only time my heaters worked was when the blower was on level 1 and only get warm air. At first I thought it was climate control/ motors not moving, stripped the car to find out it was not that. While stripping the car dash I had access to the heater matrix both pipe was running hot. Searching all this up everyone was saying it’s heater matrix but not really any story just saying common issue so I took a chance and changed it and my heaters are working. Few advice from garage owners saying it not heater matrix because the pipes are hot… made me think 10 times just because the heat pipes are not hot doesn’t mean the heater matrix not faulty. The coolant will circulate even if it’s blocked. problem was heater matrix, coolant flush and when adding new coolant used a vacuum seal pump, drove it few miles and topped up coolant to normal level.

This might be a few years later reply but I have Audi a3 8v and the car still drives perfect. Coolant temperature stuck at 90 and not loosing any heat so it couldn’t be thermostat. If the thermostat was blocked car will over heat, if it was open stat the car temperature will fluctuate and will give heat when driving. The only time my heaters worked was when the blower was on level 1 and only get warm air. At first I thought it was climate control/ motors not moving, stripped the car to find out it was not that. While stripping the car dash I had access to the heater matrix both pipe was running hot. Searching all this up everyone was saying it’s heater matrix but not really any story just saying common issue so I took a chance and changed it and my heaters are working. Few advice from garage owners saying it not heater matrix because the pipes are hot… made me think 10 times just because the heat pipes are not hot doesn’t mean the heater matrix not faulty. The coolant will circulate even if it’s blocked. problem was heater matrix, coolant flush and when adding new coolant used a vacuum seal pump, drove it few miles and topped up coolant to normal level.