On February 20th, I turned on the van and noticed the climate control system was blowing very hard so I tried to turn it down but nothing worked. I tried to turn the power off and it turned off the lights of the climate control panel, but the air continued to blow, but even harder through the vents.
There is a control module that is located behind the glove box that needs to be replaced. cost is less than $100. Very simple to replace. Remove Glove box and swap out part. Phillips screwdriver needed.
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the heater works from hot coolant flowing through it so if it stopped working but was working recently , the problem will be in the heater control tap not turning on ( control module )
the blower works of electrical and trying to blow air indicates a problem in the fan speed control ( again a control module module)
if you have a climate control system in the car It may be the climate control module that is faulty as it controls both
Could be one of several things. Your car has automatic climate control that takes air temp and coolant temp into consideration in controlling the heater components. The heater blower will not come on until the heater warms up. So the engine thermostat could be faulty and the engine is taking a longer time to warm up. The electronic controller adjusts blower speed. And the blower motor could be going bad. You may have to get a shop to take a look at it - someone with the books and tools to test the system.
The heater/AC control is fairly complex. AC is used to defrost windows even in the winter, so not unusual to have it on. Is this a climate control system with temperature sensors or just manually controlled from dials on the heater control? Could be just the heater control is bad. If a climate control system, then we need to look at all of the sensors first.
When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck
The valve (called the heater tap) which controls the hot water flow works from engine vacuum. The climate control unit turns vacuum on to close the valve and turns vacuum off to open it, if the vacuum tubing or vacuum service valve has failed, the tap will be open allowing hot water to flow. The same result applies if the heater valve itself has failed (which they do --regularly) Trace the water hoses from the enginebay firewall under the hood and you should find the valve. Check for cavuum at the valve with the climate control set to its coldest setting. If you have vacuum at the valve, replace the valve. No vacuum points to the loss of vacuum source or a faulty vacuum service valve with will be electrically operated from the climate control. Trace the vacuum hose from the heater valve back to the vacuum service valve and check if the valve has vacuum supplied to it. No vacuum means a vacuum hose has blocked, has a hole in it or has been removed from the manifold. If the electrical valve has vacuum, check for power. If power is present but still no vacuum at the heater tap, replace the service valve. If power missing, check fuses. If both wires to the valve show power present, have the climate controll unit checked by a professional..