NSeagle78

iTrader: (5)

I am in the process of cleaning my cabin air filter compartment (SC400 1992 automatic). There was no filter in it so there is a lot of pine straw and other stuff in there. My question is, can anything down there cause the heater to initially blow some what warm air and after 5 to 10 minutes the air cools down significantly. I would like to check this now because I have everything torn apart.
Thanks in advance

RTIS250

iTrader: (9)

I would check your heater control valve, and also check to see if you have any air in the cooling system.

NSeagle78

iTrader: (5)

cooling system low so I suspect you are right, also where is the heater control valve located on a SC400 1992

RTIS250

iTrader: (9)

Should be on the passenger side of the firewall...