Have a 93 Cont. with the 3.8 Ltier and thermostat was bad and fixed that and now it only heats when you are accelerating so if ure going down a hill or sitting idle at a stop light etc. it changes to cold air and also if been driving for like 10 min. in town without defroster or heat or nothing on it starts steaming from under the hood but if u turn the heater or defroster on then it stops steaming but no warm air whats the deal?
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First make sure the coolant level is full. This should be done with while the engine is cold.
If it's full than its most likely a bad thermostat, but could also be a bad water pump, or a bad electric fan ( don't remember off hand if yours has an electric or mechanical fan). If the water pump was bad you would not get heat out of the vents. If there is heat out the vents than the thermostat would be the most likely fix.
Yes a restricted converter can cause an engine to over heat because it can't breath correctly so it make the engine work harder . Cooling fans not working is one of the most common causes for 93 to 95 dodge caravans over heating . their is a cooling fan control mddule located on the inside of the frame rail next to the radiator on the drivers side of the van that goes bad very often . Thermostat sticking is another fault that can cause over heating
Yeah, could just be the thermostat. Highly doubtful if heater core is clogged because the heater core would go bad before it clogged. When you push accelerator, that is heating the engine more, therefore circulating more water, and the water is being heated more, and that will push open a thermostat that is going bad. So start there.
From the last portion about your drving conditions, it is normal operations....it gets hot, especially going up hills with the A/C on. Sometime the water pumps start to weaken but also a clogged radiator, slowing the flow of cooled coolant through your motor or even through the radiator....check to be sure you have the proper level of coolant also.