2005 Grand Caravan has no heat at all - has digital A/C and Heat controls. Engine temp comes up on the gauge so it's not a stuck thermostat

it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Could possibly need a new thermostat, the thermostat opens and closes depending on the heat of the coolant. maybe also check your heating core. as well as the quality of you coolant.

what motor do you have? have you change the thermostat lately? check the 2 hose to the heater core ,and see if they are hot. if only one is hot then you have a clogged heter core

The thermostat controls the temp of the engine. The temp sensor tells the gauge what temp to display. If the heater is still putting out a lot of heat then it may be a false reading temp gauge. If however the temp is noticibly cooler then replace the thermostat. A stuck open thermostat would also cause the engine to warm up slowly. check for a loose/dirty connection at the plug on the temp sensor.

An electronic motor controls the temp door. Swap right for left to confirm component failure. Actuate the passengers side and look for the moving actuator

replace your thermostat

Sounds like a stuck thermostat. The thermostat cycles open and closed in order to maintain a temperature range, some cars with very sensitive gauges reflect this opening and closing, but most cars have gauges that are somewhat less responsive in order to keep people from thinking something is wrong. I would defineately replace the thermostat and flush the cooling system, replacing the fluid with fresh.

1st check the coolant level. If it's low, you won't get sufficient heat. 2nd, what does the engine temp gauge indicate? If it is only in the low side (cool, or cold), the thermostat is probably stuck open, and the car will not warm up properly, so not enough heat. Let me know if this helps or not, there are other causes of not enough heat, 1st check the above and post what you find.

thermostat stuck open or low coolant level

it is possible the thermostat is the problem, but if it is stuck closed the engine coolant temp gauge (if you have one) would show an overheat reading. most temps gauges will read 195 to 205 degrees. the other possibility is if you have an automatic climate control system, the blend door motor may have failed and will not adjust correctly to the temperature you have set for the interior