I get intermittent heat in my 96 Voyager. No water loss and there is hot water going to the heater core. It's just sometimes when I start the car I don't get any heat. It is usually after it has run properly, warmed up, and then turned off. I have run a diagnostic test by depressing the 2 wiper switches and on upper button flash and 5 middle button flashes. Does anyone know what this code means? My mechanic doesn't have a record of it on his diagnostic list. Any help will be greatly appreciated. Next step is to go to the dealer for a body diagnostic. Thanks

Frank