The 75 and ZT Owners Club Forums - View Single Post - Couple of theories on the diesel cool running problem?

Mike24 · 6th January 2016, 07:05

I'm sure you've considered this, but using the aircon automatically switches on the radiator fan. I believe using the "econ" button instead of the "auto" button disengages the aircon pump and switches the fan off. With the colder weather the fan might make the problem worse.

I'm a little surprised to hear that the heater works well, most reports of poor heater performance seem to be linked to low coolant temperature. Is it possible that the coolant is at the right temperature and it's the temperature sensor that's faulty?

6th January 2016, 07:05	#5
Mike24 Loves to post Rover 75 CDTI Auto Saloon Connoisseur SE Join Date: Apr 2015 Location: Coventry Posts: 358 Thanks: 166 Thanked 67 Times in 56 Posts	I'm sure you've considered this, but using the aircon automatically switches on the radiator fan. I believe using the "econ" button instead of the "auto" button disengages the aircon pump and switches the fan off. With the colder weather the fan might make the problem worse. I'm a little surprised to hear that the heater works well, most reports of poor heater performance seem to be linked to low coolant temperature. Is it possible that the coolant is at the right temperature and it's the temperature sensor that's faulty? Last edited by Mike24; 6th January 2016 at 07:08..