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either a heat switch is not switching heat to the compartment or else the thermostat in the cooling system is defective. when it is not open it does not let hot water to the internal heating system, has your engine been overheating or running hot? also as this would be a symtom.
Your engine thermostat is stuck open and this is what is causing the problem. You will need to have a new thermostat fitted - Usual cost is between $15 to $30. Maybe less depending on thermostat type.
How the thermostat works is it remains in a closed position within the engines coolant circulating system to allow the engine to heat and reach its optimum operating temperature. The thermostat then opens to allow the coolant to circulate freely. When the thermostat becomes faulty it fails to respond to the temperature of the coolant. What has happened it that it has opened and is stuck in an open position allowing the water to circulate too freely around the engine - you will see a brief rise in temperature when the engine is worked hard but as soon as you come to rest the temperature falls back again as the thermostat is not closing when it should.
Solution - replace thermostat and all will be well!
Hope this helps. Please remember to rate my answer. Many Thanks.
Ensure your cooling system is full.
With the engine at operating temperature feel the heater hoses going into the firewall. They should both be warm.
If all that is ok inspect the heater temperature door. The door that operates when the heater valve is actuated.
Since your blower is working and it is a heat issue,thats where we'll
start,First thing is have you checked the coolant level in the radiator when
engine is cold,make sure it is filled to top,next verify you have coolant in
reserve ,Start your van and get it up to normal operation temperature,If your
heat gauge on the dash works correctly it should be 190 degrees,Now lift the
hood and locate the two heater hoses going into the heater assembly at the fire
wall,Both hoses should be hot to hold on to,if both are hot and no heat inside
your problem will be the blend air door in heater assembly. if neither hose
is that hot you need to replace the thermostat in the engine to get it up to 195
degrees. if one hose is hot and one is luke warm then the heater core is
blocked and to blame. hope this helps you.
Make sure when you add coolant to system, that you have heater running while filling it and be sure to bleed all air out of system. Keep a real close eye on coolant level for a while as you may have caused worse damage, and if you keep having to add coolant. It would also be smart to change thermostat before refilling system, but if not, keep a close eye on temperature gauge for a while to make sure it doesn't go too high, or jump erratically from cold to hot, indicating faulty thermostat. Check oil often as well.