I'll pull the temp sensor and chek it out too. I am now getting heat and then it will slowly go back to cool air. Then a blast of heat then back to cool air.
I just duct taped the foam hose back together in there but should have pulled the sensor and checked it.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique