I had the same problem on my '96 lwb t4 caravelle VR6, I found a 10A blown fuse (whilst looking for windscreen wiper fuse which was also blown as I hadn't freed the wipers from the snow/ice on the screen before activating them) and when replaced the problem was cured. I think the reason why this worked, is that particular fuse supplys the mixer valve that adjusts the heater water temperature and when there is no volts the valve only allows cold water to flow to the heater. As I don't have a circuit diagram, fuse box drawing or handbook I can't say if this fuse performs that function or not all I know is that it solved my problem.
The maximum capacity is 2.5 liters and the minimum is 1.9 liters (depending on the size of the engine for the VW Transporter van.
Drive belt slipping? Compressor seizing and not turning?
Check if small water hoses are hot going toward firewall and heater. Fan not blowing? 15 possible problems. Check all fuses.
It's either the thermostat or the heater controls.
Blown fuse, defective Blower Motor Resistor Pack, Defective Blower Motor, or Defective Blower Motor speed control switch.
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Thermostat is missing or stuck open, coolant level is low, heater core is plugged or heater control valve is stuck closed.
This van comes with at least 5 different engines. - Please say what type yours is T4 Transporter 2.5
If there is not cold air blowing out then you could go get your ac charged
can I buypass the rear heater valve and run two heater 1986 gmc van
Unless your van has some unusual heating system, the heat going out could mean that you are totally out of coolant, or your thermostat may be stuck closed. If you have a normal heating system and your heater is still blowing air, just not hot air, it could be those two things. Is the van having any other problems?
Possible low freon.