MG ZTT CDti - heater hot air problem

TOMPARKER44 · 31st October 2019, 07:21

Hello all,

I have had my car for 9 years now and it's done 180k. 2 years ago had problems with muck in coolant, coolant loss and excess smoke from exhaust. The heater also didn't blow hot air. After taking it to a garage ended up having the head gasket replaced and new injector O rings. That fixed those problems....apart from the heating, still blowing cold. Had the air-con filled up and all ok there now. Now it's Winter windscreen gets very wet and freezes inside and heater only kicks in when I accelerate over 2400 rpm and it's not that hot even then.

I have read about thermostat, heat exchanger, air in coolant system etc....but before I do anything can anyone guide me to what checks I should do in which order to fix this please? I don't want to waste my time taking the heat exchanger out and cleaning if it's the thermostat etc..

31st October 2019, 07:21	#1
TOMPARKER44 Newbie MG ZT-T Join Date: Jul 2014 Location: EAST SUSSEX Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	MG ZTT CDti - heater hot air problem Hello all, I have had my car for 9 years now and it's done 180k. 2 years ago had problems with muck in coolant, coolant loss and excess smoke from exhaust. The heater also didn't blow hot air. After taking it to a garage ended up having the head gasket replaced and new injector O rings. That fixed those problems....apart from the heating, still blowing cold. Had the air-con filled up and all ok there now. Now it's Winter windscreen gets very wet and freezes inside and heater only kicks in when I accelerate over 2400 rpm and it's not that hot even then. I have read about thermostat, heat exchanger, air in coolant system etc....but before I do anything can anyone guide me to what checks I should do in which order to fix this please? I don't want to waste my time taking the heat exchanger out and cleaning if it's the thermostat etc..