Renault Kangoo 1.2 no heat from the fan?

Hi all,

I'm currently using a renault Kangoo 1.2 LPG van as a run around and have a recurring issue which is starting to become a bit of a pain.

The van will get up to temperature quite quickly (judging by temp sensor on the dash) but will only produce a blip of heat when the heater is turned on, after that it dissipates back to cold.

If I leave the fan on setting one with max heat, it constantly blows a little bit of heat, setting two gives more air but less heat (best described as "less cold", and setting 3 is strait up cold.

I recently had a complete engine rebuild as I failed, badly, on a head-gasket replacement. So it has a brand new water pump, I have checked the bleed screen just after the heating matrix and it, well, bleeds.
I was hoping the engine rebuild would cure the issue but no joy.

I add at this point that the LPG system is currently deactivated (though the coolant does run through the heat exchanger for the LPG still) and the radiator recently got changed.
With the rebuild it got new coolant, etc.
Fan blower works fine, plenty of air-flow. Just, no heat!

Am I missing something?

Thank you,

Groot

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Renault Kangoo 1.2 no heat from the fan?