I have a 1999 E320 RWD. When the A/C is turned on the air blows cold for about 2 - 4 minutes and then it seems that the compressor cuts out and blows warm air. When the car is shutoff and left for 15 - 20 min. the A/C blows cold again. The following are the readings from the car. I am in Canada so the readings are in Celsius?

EC light is not stuck on.
Sensor values:
1 - 25
2 - 26
3 - 24
4 - 24
5 - 64
6 - 72
7 - 09
8 - 41

the error codes are B1227(outside temp), B1234(Sun Sensor).

Does this mean the both sensors are malfunctioning or is there a cause and effect happeniing here?

Any help in identifying the actual issue would be greatly appreciated.