Probably a bad thermostat - stuck open so the water temperature in the engine block doesn't get hot enough to make the heater warm.
The heater would not be working on a 1990 Dodge Grand Caravan if the heater core is damaged or blocked. Hot coolant from the engine must flow through the core to allow hot air to pass into the cabin.
Either a clogged heater core or a thermostat that is stuck shut.
check for coolant in system...radiator..next check for heater core leaking and verify if your thermostat is working(if it opens when engine is warmed up...hope this helps you..L
If you have to ask, you do not need to know how to do it.
Was produced in May 1990. 05=May...90=1990
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we changed radaitor & thermastate , now heater blows cold air
Plugged heater core. Faulty temp blend door mechanism.
Check your thermostat first, if that's OK then your heater core is likely bad
The core is probably plugged.
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