I've tried searching and can't find anything quite like what I'm experiencing, so any help is appreciated.
Bought the vehicle 2 years ago with about 60k miles, and at that time replaced the water pump. Vehicle today has right at 94k miles. Have serviced regularly and had minimal problems with it.
Prior to the last 3 weeks, my vehicle has always stayed right at 80-85 regardless of outside temp. In the last 3 weeks it first started edging up around 90, then closer to 100, then suddenly one day on the freeway jumped to 120, then dropped almost immediately back down to 90.
During this time I took it to a mechanic (not a dealer, but specializes in MB) who first did the 100k mile service on it. Didn't resolve problem, in fact, now the reserve started overflowing when it would get up around 100. Next changed thermostat. Still not resolved as of today.
I'm about at my wits end and really fed up with this mechanic who seems to know next to nothing about cooling systems (I had to suggest to him replacing the thermostat), so I'm looking for suggestions on what might be going on.
Could the water pump be bad again? Could the radiator be cloged?
Thanks in advance!!
Bought the vehicle 2 years ago with about 60k miles, and at that time replaced the water pump. Vehicle today has right at 94k miles. Have serviced regularly and had minimal problems with it.
Prior to the last 3 weeks, my vehicle has always stayed right at 80-85 regardless of outside temp. In the last 3 weeks it first started edging up around 90, then closer to 100, then suddenly one day on the freeway jumped to 120, then dropped almost immediately back down to 90.
During this time I took it to a mechanic (not a dealer, but specializes in MB) who first did the 100k mile service on it. Didn't resolve problem, in fact, now the reserve started overflowing when it would get up around 100. Next changed thermostat. Still not resolved as of today.
I'm about at my wits end and really fed up with this mechanic who seems to know next to nothing about cooling systems (I had to suggest to him replacing the thermostat), so I'm looking for suggestions on what might be going on.
Could the water pump be bad again? Could the radiator be cloged?
Thanks in advance!!