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Make sure the heater hose is hot with the engine is warm. The heater hose goes into the firewall and into a heat exchanger/ blower fan that will give you defrost and car heat. If the heater hose doesn't get hot you may have a blockage in the hose or at the radiator outlet.
160 degrees should be hot enough to get some heat. You could check the engine temp with a scanner to confirm. I would double check the blend doors, and the temp of the coolant in and out of the heater core. I use an inferred temp gun.
Roger it sounds like the blower motor is not comming on. There is a resistor network located in the engine compartment on the passenger side mounted to the firewall, that controlls the blower motor. The connections may have corroted or the unit itself is bad. That was the first thing I had to relpace when I got my used 92 Dakota. There is also a 30 amp fuse in the fuse box under the dash board . If that is blown I would suspect the blower motor is seized up or just pulling too much power.
Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly. if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees. if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.
It sounds like the heater valve is not operating. Find the valve on the engine firewall passenger side and manually open the valve. Find it by following the 3/4 inch heater hose to the firewall where it is connected to the valve. Most likely the cable ( or vaccum hose)from the temperature dial to the valve needs replacing.
check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose
The first thing to check is the coolant level, if the coolant is full and the heater core hose is extremely hot to touch, then you may have a door problem. If you like we can work together on this problem. First check the coolant level. Then run the engine until operating temperature, grab each of the heater core hoses and let me know what you find.
I had the same problem with my 96. What I found was that someone had placed stop leak in the system, so I had to take a garden hose with a pressure tip on it, disconnect both upper and lower heater core hoses and flush the core several times with the hose, my heater now works great.