It is inside the HVAC housing under the dash.
The heater core on a Dodge Dakota is inside the HVAC housing, under the dash.
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.
Your heater core is probably bad.
I have looked up time to change heater core on 2000 dodge caravan it said 2 hours. I have never done this so I need to know where to start?
Up and under the dash, against the firewall.
Low Coolant? Bad thermostat? Heater core plugged or restricted? Heater core airbound? Heater control cable not working?
The heater core or a hose to the heater core has a leak. Hopefully it's a hose under the hood because it's a very involved process to get the heater core out.
Drain the water from the cooling system. Remove the water hose from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
It sounds like the heater core is leaking. Check for the smell of antifreeze and that will confirm the bad heater core.
You need to recover the R134 charge, remove the whole dashboard, then remove the a/c heater box to get to the heater core. The heater core should be accessible right next to the gas pedal. No dash removal is necessary.
It's possible that your heater core is plugged up. It can also be a bad thermostat.
Disconnect the send and return lines to the heater core and connect them together