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Last year, I had an issue with the coolant temp needle rapidly shooting up, followed by the warning light. The issue went away after restart. It happened again afterwards and I noticed a leak from the thermostat housing. I replaced it, along with the upper coolant hose. Fast forward to last week - it happened again. However, after I shut down the car, it wouldn't restart. After sitting for half an hour it fired back up and drove fine since. I picked up a Foxwell scanner and it pulled a faulty coolant sensor code. I ordered a sensor, but I can't figure out how to get the old one out. Is there a good DIY for this? Seems like a complete PITA and a ridiculous design.
I do not know your E350 engine type, but if M276 3.5L, coolant sensor is very hard to access. It is near the very rear end of the engine.
The thermostat at the front, that wire there is a Heater, not coolant temperature sensor
I do not know your E350 engine type, but if M276 3.5L, coolant sensor is very hard to access. It is near the very rear end of the engine.
The thermostat at the front, that wire there is a Heater, not coolant temperature sensor
Thanks guys! I replaced the sensor. The code has not re-appeared and I've also noticed that my A/C is working properly again. Pelican article is OK, but it omitted a bunch of steps. The MAF sensor and intake elbow need to be removed to allow sufficient access. Also, the crank position sensor must be disconnected. It's a pretty idiotic design because then the coolant temp sensor is removed, you will spill a bunch of coolant inside the CPS connection. I used compressed air to dry it out after the coolant temp sensor was replaced. Oh and there was also lots of cursing and painful cuts. My hands aren't exactly tiny.
06-13-2022, 05:27 PM
