Well folks this should be an interesting one.

After pulling the dash and replacing all the vac pods on my 300E, I drove from Texas to Kansas City in August in perfect comfort. Had 39 degree vent temps much of the time until stabilized on the long trip. All was well.

This morning I drove it to town in comfort but without my thermometer in the vent. After the car sat in the 92 degree weather and heat soaked, it would not make cool air at the vent in the stop and go traffic. I put the thermometer in the vent and got 55 degree vent temps on the way home, meaning highway speed for 20 miles.

After getting home I hooked up the gauges and the pressures were normal and sight glass looked good. That was a bit of a relief since my first worry was the evaporator.

I then checked at the diagnostic connector with my homemade impulse counter and there were no error codes present.

The heater valve had a hot hose going in, but no heat on the hose going out.

The temp sensor vent held a square of paper with no problem, so the sampling fan seems good.

I took it down the road and turned off the air to see if I was getting fresh air forcing through with the system off. There was no air coming through the vents at all with the system off at 60MPH.

I had turned the dial down to less than 60 degrees on the way home and it didn't make any difference.

My first thought was that maybe one of the vac pod shafts had come off, but I think that if that were the case it would blow air through the vents with the air turned off.

Any suggestions?

Thanks,