Heating problems

[Hirkoos0125]

Hi hope everyone is doing good.

I got issue of my Mitsubishi outlander phev about heating even its blowing cold air even if the temperature is set higher I wonder if it's something to do with setting.
Very much appreciated any advice.
Thanks

[twosout]

If you're not running the engine, could it be that the electric heater has failed?

[richr]

There's also a known issue with the inline filter that's just before the heater matrix getting clogged. That's not a big job to check and clean - just involves clamping the coolant hoses and disconnecting then pulling out the filter.

[BrianTheSnail]

I just bought a 2017 model from a dealer and have this exact problem - blowing cold air into the cabin when the heater should be on. Took it back and they confirmed it's the filter - they are going to replace it.

[BrianTheSnail]

I do wonder though why this inline filter is needed, and what is clogging it up. Surely the coolant loop is a closed system? It's not obvious to me what would be getting in there that would require filtering out...

[richr]

I’ve thought the same. I can see why they’ve added it though - far easier to pop off a rubber coolant hose and clean/replace a filter than strip the entire dashboard out to replace a clogged heater matrix.
But where is the debris coming from? Unless it’s a consequence of the split heat source setup on models with an electric heater - if the ICE never starts (short, gentle trips with no high heater demand) then the coolant in the engine and radiator will tend to sit around and maybe allows for some oxidation or something to take place that eventually gets flushed through to the matrix when the valve does get opened.

I wonder if the diesel Outlander has the filter?

[BrianTheSnail]

Just an update on mine - it took the dealer two days to diagnose the problem, which didn't turn out to be the filter after all - it was a loose electrical connection to the water pump. Nice to have a warm car at last!

[PenJurva]

This is what forums are all about!!! I had the same issue and fixed it with YOUR help, thanks

[BrianTheSnail]

@Penjurva, glad you got yours fixed - enjoy the warmth!

[TF1909]

I have just had this happen to mine and Mitsubishi want £1000 to drop the coolant and clean the filter. Standard charge.
It seems to happen to cars around 40-50K mark. The coolant starts to gets flakes and clogs up the filter which in turn stops the heaters working.
I am trying to find a non dealer who can sort this for me as I think £1000 is a bit over the top in my eyes but may have to go down this route.

I have found this

https://carhoodsecrects.com/mitsubishi- ... ptc-hater/