Mazda 6 - 2.2 diesel - Manual - 2015 - Gen3 - SE-L
Hi all, as the subject line suggests - I am having an intermittent issue where I will be driving after half an hour or so on normal town like roads (including motorway) and suddenly the red temperature dash light will flash for a few seconds and the engine will go sluggish. The light will vanish after a few seconds and the car will run fine again.
I have used my OBDii adaptor and Torque and no error codes are stored. Nothing seems out of the ordinary. The coolant level is fine, no leaks, the quality of it I am unsure of, was replaced in a service 2 years ago (missed one due to Covid).
I am thinking possibly the following but would like others opinions either to validate my train of thought or to debunk it:
- Engine Coolant Temperature Sensor faulty (Torque seems to show it working okay but I haven't recreated the problem to see it in Torque)
- Trapped air in the coolant system (although I think air can't just get in the system unless there has been a change)
- Thermostat faulty?
Also might be worth mentioning I have had a long-term issue with the auxiliary heat. When the engine has reached optimum temperature and I switch the auxiliary heater to hot, the heat only comes through if I accelerate. If I am idling, only cold comes through. This issue makes my cold mornings incredibly long and stressful! Perhaps these two issues are related in some way.
Any help would be greatly appreciated.
Thanks