heater blower 1972 280 sel 4.5 - Page 2 - Mercedes-Benz Forum

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post #11 of 18 (permalink) Old 02-19-2010, 07:07 AM
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6 in and 6 out? It took me about 40 hours, all told. I had to do it over 2 days. I first took it to a local guy to have it replaced, and he refused - LONG job.

Taking out the seats and speedo isn't NECESSARY, but it makes things a heck of a lot easier to do.
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post #12 of 18 (permalink) Old 03-06-2010, 02:50 PM
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Before tackling this job, I did some checking on electrical connections. I removed the plug to the blower switch and determined that there is power there. I jump a couple of connections on the plug to see if that would run the blower, and it did not. This leads me to conclude that the problem is not with the switch. So, from what I can tell, that leaves a resistor and the blower motor. Where is the resistro located, and could that even be a problem? Thanks.
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post #13 of 18 (permalink) Old 03-06-2010, 09:10 PM
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If memory serves, the resistor is part of the switch. Can you send voltage directly to the blower, to see if it spins?
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post #14 of 18 (permalink) Old 03-07-2010, 07:04 AM
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Took mine of the other day and the switch has power in and three wires for power out . for the tree speeds, so I'm assuming the resistors are down at the motor somewhere. If they were built into the switch would just have one wire for out.
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post #15 of 18 (permalink) Old 03-07-2010, 08:50 AM
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I removed the plug to the switch, turned the ignition on, and identified which female prong receptable had power. Then, I ran a wire from the prong receptable to each of the other three prong receptables one at a time. Should this have sent power directly to the fan? The fan never came on, so I concluded that the fan is the problem or the resistor, if it isn't part of the switch. Hence the question about whether a resitor problem could keep the fan from turning on.
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post #16 of 18 (permalink) Old 03-27-2010, 06:40 PM
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I am still "kissing the rattlesnake" as another member said, with my never-ending blower motor replacement project. Everything is disconnected per the Mercedes service manual, but now I don't see how the heat exchange unit can come out without removing the a/c condensor unit. Does it need to come out, too?
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post #17 of 18 (permalink) Old 03-28-2010, 10:23 AM
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This just gets better all the time. I just got back from the auto parts store and asked them for a kit to drain the a/c system. They don't have one. Plus they told me that if my perfectly-working a/c system is drained of the Freon which it probably has, I won't be able to return it to the system but will have to convert the system to 134 requiring me to replace the compressor. Can this be true?
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post #18 of 18 (permalink) Old 07-05-2010, 04:35 PM
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Heater blower motor has been successfully replaced. Everything is back together. However, if I had to do it over again, I'm not sure I would. It is that difficult and time-consuming of a job.
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