Heater blowing cold air

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this problem started last night , it's been standing for 3 weeks , put a recharged battery on , fired up first time , put heater on demist to de-ice windscreen after 15m , nothing but cold air coming out , waited another 15m minutes , still the same , then i noticed temp guage was still reading zero , any thoughts .

Thermostat.

Thermostat stuck in fully open position. I anticipate the coolant in the hose from the thermostat gets 'warm but not 'hot'.
Use correct type of daihatsu thermostat. fit with toggle uppermost, and fit new gasket plus sealant. Do not over tighten the bolts .. 5 ft/lbs max.

Thanks for the reply guys ,

Thanks for the reply guys , getting O E parts rather difficult in my area , i need the 4x4 for the weekend , so i've got a thermostat and pressure cap from local motor factor , if that cures the problem i'll order one after christmas , also ordered a new temp sensor that will take 3 days to get , so i'll change thermostat and flush the system , refill with anti-freeze and see if the gauge comes up to temp .

Thanks ..

Cold

As mace suggests, it is most likely the thermostat, if this is to be replaced it would be prudent to clean the cooling system thoroughly.

Drain the system and top up with clean water when the new stat is fitted, run the engine until fully warm and drain the system, repeat this until the cooling water is clean. Use a hosepipe and remove as many cooling pipes as possible and flush them through with the hose, do not forget the heater radiator, and ensure the heater control valve is in the hot position. If the engine is particularly dirty, use a proprietry cooling system cleaner.

Refill the engine with a 50/50 mixture of anti-freeze and water.

No coolant?

Check to see if there is any coolant in the engine (via rad cap [when cool] / squeeze lower rad hose)!

1985 Veg oil burning Fourtrak "Rocky".

1985 Veg oil burning Fourtrak "Rocky".

I hope your wrong, but that

I hope your wrong, but that was my first thought too if the temp guage is not moving at all.

Any veiws expresed in this thread by me are purely from my own experience, and (sometimes) falible memory. Hope my comments help, but please don't take them as gospel.

Any veiws expresed in this thread by me are purely from my own experience, and (sometimes) falible memory. Hope my comments help, but please don't take them as gospel.