Renault Zoe

heater not working

A common problem on the Renault Zoe is the heater stops working and it blows cold air only. There are a couple of causes of this, but try the following steps to diagnose:

Turn of ECO mode

Firstly, make sure you do all testing with ECO mode turned off. In the winter, if you want heat, do not use ECO mode as this restricts energy consumption and reduces the effect of the heating.

Adjust heating controls

Some users report that just 'messing around' with the heater controls will kick it back into life. So try:

  • taking it in and out of AUTO mode
  • turn air con on and off (when button is lit red it is off)
  • adjust temperate control max to min

Some users report that the heater works better with the air conditioner off. Try it. But this shouldn't be the case and if it is, it points to a problem which needs to be fixed.

Do not repeatedly use pre-conditioning

There are reports that using the pre-conditioning multiple times (no matter which method used to activate) can disable and confuse the heat pump controller. I assume this is fixed by a software update - see below.

Hair dryer trick

In a similar way 'messing' with the heater controls can kick the heating back into life, heating the external temperature sensor with a hairdryer can do the same. Many users have found this method works:

  • Lock the car and let it go to sleep for 15 minutes or so.
  • Heat the outside temperature sensor to 15 deg or more with a hair dryer or hot wet blanket. The sensor is the lump underneath the driver's door mirror (on UK right hand drive vehicles).
  • Unlock and start the car.
  • Select the minimum temperature and auto mode. This should already activate the heat pump as the car will try to cool the car.
  • Watch on the R-Link for the outside temperate to drop as the sensor on the mirror cools down.
  • Now select a hot (or maximum) temperature, once the outside temperature has dropped (obviously stop heating the sensor), the car should heat again.

One user wrote: "I can confirm that this does work! Blasted the sensor with a hair dryer for about 30 seconds. Sensor registered 22C. Stuck the air con on at its lowest setting and ran it for a couple of minutes. Switched the hair dryer to cold and cooled down the sensor until it went down to 14C. Outside temperature is 4C. Whacked the temperature up to full in the car and about 2 minutes later weh-hey! Thank you, thank you, thank you - still booked in to Renault though."

Exterior temperature sensor under offside mirror

Air conditioning re-gas

If the air conditioning system is low on gas, then this will also stop the heating on the Zoe. If you find your Zoe is making a loud grinding noise when the heating is on, then this is likely they cause and probably the most common source of heating problems with the Zoe. If the system is low on gas, it means there is a leak in the system, which is normally due to a dry rubber seal. The problem is compounded with electric cars as users tend to not use their air conditioning as much, to preserve energy. This results in seals drying out and then eventually refrigerant leaking.

The next step is to get the gas level in the system tested and check for leaks. If the vehicle is under warranty, get a Renault dealer to do this. If there's a leak, then this should be covered under warranty. Don't let the dealership try to charge you for gas though, as the loss of gas was the result of the leak! If the car is out of warranty, then most garages can carry out air conditioning re-gas work. The Zoe uses R1234yf gas (refrigerant/coolant) and has a total capacity of 1,000 grams. Check the garage has this first, as many smaller garages will not as this is only used on the latest vehicles.

Get software updated

If you still have heater problems, get a Renault dealer to check the software version. Many users have had the 'bugs' fixed by having the latest software loaded.