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Probably a bad thermostat - stuck open so the water temperature in the engine block doesn't get hot enough to make the heater warm.
Dodge does not use inertia/reset switches.
It is located under the center console under the heater controls. Its a small metal box with a 8 wire plug.
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.
"5-1/4"
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Struts front, shocks rear.
easiest way to fix a heater core prob, especially if it's stopped up, is to flush it, but if you don't want to take the risk, then you need to tear out the dash. That's a job.
very carefully
sounds like you still have a leak drive safe
no , it's front wheel drive
No, the computer controlls that.