In my 86 300E, the auxiliary fan does not come on when the temperature exceeds 115c. The fan works with direct power from the battery. There is power on the 30 terminal from fuse 7 and from fuse D on the K9 and K10 relay. Apparently the relay is not moving from the 87A to the 87 position because when I manually jump the 30 and the 87A the fan works. What am I missing? Are these relays prone to failure? The fan also works when I jump the high pressure switch. Any help would be appreciated.
JohnO