I have purchased a 1992 190e 2.6 at Auction. The car looks great, virtually brand new. A the time of purhcase there were two obvious issues in the engine compartment.

A short section of the Radiator intake was broken off, where the hose connects to the Radiator. And the Heater Core was bypassed with a hose draped over the engine and back into the block (where the heater Core Return would normally go.

Problem - It Overheats

Due to it's age and questionable up keep, I am replacing more than simply things I know are broken. I have replaced the following in search for a solution to this problem.

• Radiator
• Thermostat,
• Water Pump (What a Joy!)
• Fan Clutch; Updated Version
• Radiator Cap
• Temperature Sender Switch; For Temperature Gauge
• Radiator/Auxiliary Fan Switch; Blue Insulator with 2 Prong Connector; 130 Degree C
• Coolant Temperature Switch; Black with Round Top and 4 Pin Connector; For CIS and Cooling Fan Control

Still have the same problem. On Idle the temp slowly climbs to 100, Aux fans go on, slowly continues to clime to 120.

Note: I have not installed the Coolant Temp Switch yet. (I have not found a tool to extract it yet) I did not think that it was the problem, only replaced because it was related to cooling and I was replacing all parts related to this topic)

Could it be that I am not "Bleeding" coolant into the system correctly and have an Air blockage?

Second Question. Is there any way to test the Heater Core while in Car. I can only assume that it is faulty and they previous owner could or would not replace it. Can it be pressure tested?