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#1
12-05-2009, 08:26 PM
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Climate control issues
87 300E W124, heat won't kick in on cold days (30's F) until the engine temp reaches at least 80 degrees C . On warmer days (50's F), heat kicks in when the engine temp is warm enough to be used for cabin heat.
Anyone got any ideas on what's going on? Seems like a short... Thanks guys. Cam __________________
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1987 300e W124 M103 My baby. 
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#3
12-07-2009, 06:19 PM
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Sounds like you have a temperature sensor that has drifted in value.
Let the car sit until the engine is at ambient temperature. Use an ohmmeter to measure the resistance of the sensor, and compare it to the reading that you are supposed to get for the given ambient temperature. There is a chart that plots the various values for the NTC (negative temperature coefficient) sensor. I posted one here for my W126, I am not sure of this but I would not be surprised if the values are the same for your sensor, but you will want to verify that. Here's the thread where I posted that chart, again make sure it applies to your car. Hard to start when warm Good luck.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#5
12-10-2009, 11:10 PM
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actually, on the 124 that's how it's supposed to work....I hate it myself..but that how it works.....does what it wants....you, the driver, are an idiot and don't know how to control your interior environment...I will do this for you
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#6
12-11-2009, 08:42 AM
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Tinypanzer, you lost me with your suggestion in re: the CTS as a possible fix for the OP's climate control system. Inasmuch as the two thermistors in the CTS provide signals for the KE controller and the EZL controller, neither of which have an effect on the CCU, what's your thinking about how a bad CTS will lead to the no heat condition from the CCU? I'm not doubting you, just need clarification of how that could be the cause.
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't
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#7
12-18-2009, 09:12 AM
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So, I tested all sensors and they all are drawing appropriate ohms. I'm figuring it may simply be a bad blower/regulator and may start there. Could it be that a cold blower can't draw enough current to run until it warms up? Because once everything is warm (now approaching closer to a 30 min period) everything functions without issue.
...the investigation continues... Thanks guys
__________________
1987 300e W124 M103 My baby.
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