Cleanworks
Moderator
Have the vans cooling system checked. When you're driving, air is coming through the rad and helping to cool the system. When you are parked you are dependent on the fan bringing enough air into th system. A good test would be to let your van idle without the cleaning system engaged and see what your water temp is. If it runs normal but overheats when you engage the cleaning system, most likely the problem is not with the van but somewhere in cleaning unit. Could be issues with the hx's or the unit is putting more strain on th van,s engine than it should