My heat and A/C system has just started emiting a bad odor from the vents when in use. This odor is very familiar to me, as I once had a Jeep that blew rancid air, and the cause was a dirty evaporator. My questions is, how difficult is it to access the evaporator on a 1999 E300TD? Thanks

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2006 E320CDI- current dd
1999 E300TD - retired
Wilmington, NC USA