What was found
FOUND STIFF HEATER VALVE ON A DAILY AIRWORTHINESS CHECK. SPRAYED LPS 1 ON THE U JOINT LINKAGE AND WORKED HANDLE BACK AND FORTH. ON THE NEXT FLIGHT THE CREW ASKED THE PILOT FOR SOME HEAT IN THE BACK OF THE ACFT. HEAT VALVE WAS TURNED ON BY THE PILOT. THE MED CREW NOTED A SMELL AND VERY SLIGHT SMOKE COMING FROM THE FLOOR WERE THE KNOB MEETS THE FLOOR. THE PILOT TURNED OFF THE HEATER AND TURNED ON THE CABIN FAN. SHORTLY AFTER, ABOUT 2 MINUTES, SMELL AND SMOKE WERE GONE. THE ACFT WAS SAFELY LANDED AT THE NEAREST AIRPORT. UPON INSP BELOW THE FLOOR THERE WAS A VERY SMALL AMOUNT OF LPS DIRECTLY UNDERNEATH THE HEAT VALVE. NO OTHER CAUSE COULD BE FOUND. AFTER A REVIEW OF SB, FOUND 21.04 SUBJECT NEW P2 VALVE. THE REASON IS TO PUT AN END TO POSSIBLE SEIZING OF THE P2 VALVE. BELIEVE THE LINKAGE WAS NOT THE PROBLEM BUT IT WAS DUE TO A SEIZED P2 VALVE. IN THE FUTURE TO PREVENT POSSIBLE SMOKE AND ODOR IN THE COCKPIT. THE USE OF A RAG PLACED AROUND THE U JOINT WOULD ELIMINATE LUBRICANT ON THE P2 VALVE.