No cabin heat

[ajay16]

I have no cabin heat at all, it just blows cold.

Resevoir is full.
When I switch on heat and fans just the fans blow.
Liquid in the resevoir gurgles and moves
Checked heater fuse in cabin.

A/C works just fine and is icey cold.

Reading fault codes I did have the B1108, cleared it and tried again but it hasn't come back so far...

Any clues or things I should try?

 

[MickeyS70]

I have no cabin heat at all, it just blows cold.
Resevoir is full.
When I switch on heat and fans just the fans blow.
Liquid in the resevoir doesn't move.

There are two reservoirs, one for the cooling circuit (boot), the other for the heater (bonnet).

I assume you checked the front one, if there is no water movement, the pump doesn’t seem to be running but usually that would throw a DTC?

Best to start with the basics, did you check the pump’s fuse and relay?

For details see service manual
http://mmc-manuals.ru/manuals/i-miev/online/Service_Manual/2012/index_M1.htm

 

[ajay16]

Upated my original thread as I realised the car wasn't in a 'ready' state when testing earlier. First realised there was no heat while out driving. Water in the front tank does gurgle and move.

Fuse checked for the heater by the drivers footwell.
Is the relay under the bonnet? I couldn't see a mention of that in the repair guides - thanks for the link, super helpful.

 

[MickeyS70]

Upated my original thread as I realised the car wasn't in a 'ready' state when testing earlier. First realised there was no heat while out driving. Water in the front tank does gurgle and move.

Yes, heater is powered by HV, only works in READY

Fuse checked for the heater by the drivers footwell.
Is the relay under the bonnet? I couldn't see a mention of that in the repair guides - thanks for the link, super helpful.

The 12V fuse is for the low voltage heater controls not the actually heater itself. There is a 20A HV fuse but that’s not accessible (inside HV pack). No heater relay.

Easiest way to determine if any of the 3 elements inside the heater are working is to turn on the heater when READY but stationary, the ‘consumption needle’ should move noticeably and RR will decrease accordingly.