Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Looks like your E350 is getting a bit hot under the collar! When your water temperature hits 240 degrees at a stoplight, it's a sign that something's not quite right with your cooling system. Since this started in the hot weather, the usual suspects could be:
Cooling Fan: If the fan isn’t kicking on when you stop, your engine won't get the airflow it needs to stay cool. Check if the fan runs when the engine gets hot. If not, it could be a faulty fan motor, relay, or temperature sensor.
Thermostat: A stuck thermostat can prevent coolant from circulating properly, causing the engine to overheat. This is a relatively easy fix if that’s the case.
Coolant Levels: Make sure your coolant is topped up. Low levels can lead to insufficient cooling.
Radiator: Check for blockages in your radiator that might prevent proper coolant flow. Over time, debris and dirt can clog the radiator fins.
Since the problem started with the heatwave, it's crucial to address it quickly to avoid more serious engine damage.
If you need more advice, have other questions, or need to find a certified repair shop in your area, just let me know! Call us at 877-913-1554, and we'll gladly find you a certified RepairPal shop in your area!
