Fine the engine is heating and you say leak under van. What is the leak, is it water/ coolent/ oil or what?
is it possible to know where the leak is coming from?
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check all your hoses run vehicle for awhile the inspect hose in this area. look for obvious things next check at the engine to see if a freeze plug is leaking then inspect you heater assembly the core may be leaking I'm leaning toward a hose or shut off valve
The Chrysler minivan products all had leaking problems. I have had 5 or 6 different Dodge or Plymouth minivans from 88 to 99. How bad is it. The most common thing is Valve cover leaks. Front and rear seals in the engine leak as well as the oil pan gasket. If its leaking a little bit at a time open the hood and look at the front and rear of the engine. Do you see grease and oil that has gone down the sides of the engine? Do you see a lot of grease on the engine with some clean streaks going through it. You may be able to see where its leaking from. If you know someone that knows what their doing have them change the leaky gasket/s. If not you can probably have it repaired for less than buying another van unless other things are seriously wrong with the van.
Hope this helps... Dale
Possibly coming from engine compartment (engine or radiator, hoses, etc) and running back on frame before dripping down. Pressure test the cooling system to eliminate some of causes if this is the case,
When your not feeling heat coming from the heater it usually means that the coolant level is too low in the radiator. It sounds like you have a coolant leak somewhere which is causing your overheating problem. Fill your radiator and let the engine run for about a half hour with the radiator cap on tight. Then turn off the engine and check for any leaks under the van. If you don't see any leaks under the van then see if the carpeting is wet on the passenger side of the vehicle. If the carpet is wet and it smells like anti-freeze you have a heater core that is leaking.
I hope this helps you. :)
The problem sounds like either the inlet or outlet hose to the heater core is cracked or split. Or the heater core itself is at fault. Need to inspect the hoses from engine to the firewall going to the heater core for damage. If no leak from the outside then problem will be on the inside under the dash. Hope this will help you.
Possible coolant leak on hot engine parts causing it to evaporate as it leaks. That would definitely invade the cabin air.
You would need to carefully check under the hood with the engine warmed up and running.
Also could be a headgasket failure between coolant channels and a combustion chamber. This latter problem sometimes shows itself as vapor at the tailpipe after there should be no more visible. You may also detect the odor of coolant there too.
This could be a serious problem. Check your coolant level, then check the rear heater lines that supply coolant to the rear heater. They run under the van, over time they rust and leak. Because it is under and to the rear of the van it is hard to notice, i.e. coolant puddles and smell. But please note that this engine has aluminum cylinder heads and does not take kindly to being overheated.
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