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A/C modified: ETR-switch from Maytag
I'm using the MB service manual terminology, instead of WorldPac, to descibe a substitute for the ETR-switch on 123 and early 126(81-85). The one that disconnects the compressor when the evaporator nears freezing.
The problem with many ETR is that it's set way too high thru over-caution by MB or just old age on our cars; 38ºF is not uncommon. While I was adjusting my ETR (which is a pain to do) I noticed the similarity of the RANCO (a major manufacturer in controls) ETR from Mercedes with the General Electric thermostat I'd just replaced in my refrigerator. Pic #1. Ranco ETR from Mercedes (difficult to adjust, done by very few) Pic#2. My refrigerator Pic#3. General Electric ADJUSTABLE thermostat (ne. ETR ![]() Pic#4 After testing in ice water and set for 32º wired in for test runs. Pic #5 Industrial strength ETR ![]()
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The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later) |
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