tug
Posts: 2
Joined: Sun Nov 06, 2022 6:55 pm

Heating not working

Hi. I have an VRX 2, registered 2014. I had the starter battery replaced at the Mitsubishi dealership about two months ago and since then I noticed that the heating wasn't working.

If I run the car on SAVE or CHARGE then it will eventually generate some heat, but not when I put it at a normal temperature. The aircon seems to be working ok and I'm not getting any other warning lights.

I contacted the dealership to see whether the battery replacement could have caused this, e.g. something was reset or needed resetting afterwards, but I got a rather disinterested 'no'.

I'm taking it to our local small garage soon to have it scanned but I wondered whether anyone here had any ideas?

Any thoughts?
DibbyDibbyDJ
Posts: 117
Joined: Sat Dec 28, 2019 2:34 pm

Re: Heating not working

Get your garage to check the coolant filter in the heater hose is not blocked with sediment. This is a very common cause with heating problems on the PHEV
2022 MR Triton, 2022 YB Eclipse Cross
Master tech @ main dealer
mitsubishi-forums.com
kiss
Posts: 4
Joined: Wed Sep 07, 2022 10:13 am

Re: Heating not working

Hi
Looks like the filter is blocked but needs to flush out the system but many reasons is why not to heat just the little help here: https://carhoodsecrects.com/mitsubishi- ... tc-heater/
tug
Posts: 2
Joined: Sun Nov 06, 2022 6:55 pm

Re: Heating not working

Thanks for the replies. Since I posted I had the fault scanned and it came up with an 'electric water pump' malfunction code. We reset it but the heating still didn't work and the fault code came back again.

The garage, which isn't familiar with the car or EVs, asked whether my 2014 VRX has 2 separate heating systems, i.e. one which runs when the car is running off the EV battery, and one which runs off the combustion engine. The reason for this question is that the heating only works when the petrol engine is engaged, e.g. when I active SAVE or CHARGE, and not when the car is running off the EV battery. I've tried looking online for an answer and in the manual but can't find a definitive answer.

It still puzzles me that the fault only occurred after the car had a new starter battery installed. Was that just a co-incidence??

Any thoughts?
MrPastry
Posts: 98
Joined: Tue Aug 23, 2016 1:41 am
Location: South Wales, UK

Re: Heating not working

Hi.

Maybe a co-incidence.

I think all models except the basic "3h" have an electric cabin heater.
If you have cabin heating when the engine is running & no heat when in EV mode, I'd check the pump, but before you go any further, firstly make sure that there's not air in the pipework around the electric pump. The pump will get really noisy is it is running dry.


The small electric water pump mounted on the firewall behind the engine.
This recirculates the water when the engine is not running. These pumps do fail.
As stated previously, the gauze filter is prone to getting blocked. This is hidden inside the pipe above the pump.
If the gauze filter is completely blocked, you won't get any cabin heat.

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Then there is a water bypass valve. This is mounted on the rear of the engine. These too can fail.

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The electric water heater is under the floor beneath the passenger seat.

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Lots of useful information here:
http://mmc-manuals.ru/manuals/outlander ... dex_M1.htm

And here:
https://www.richi.uk/p/mitsubishi-outla ... l#phevfaqQ
GX4h (2018) Atlantic Grey
littlescrote
Posts: 409
Joined: Fri Jul 26, 2019 3:52 am

Re: Heating not working

^^^^ great post ^^^^

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