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87 300E fan blower needs diagnosis
OK guys, I've scoured the archives and found a tidbit here or there on this. I need a little more detail. I wanted to see if my fan blower needed replacing or if it was a switch or something. In one of the posts I found some one mentioned that the fan leads were around the brake booster. I think I found them. Is this a three prong connector that then shoots off with another wiring harness into the blower housing? If I could have some idea of what voltages I'm looking for that would be a help. I hooked up my voltmeter and went inside the car to operate the switches, there was no change when I pushed the fan buttons. Any ideas out there? Thanks in advance.
Thom
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1987 300E 1967 Jaguar E-type Series I, 2+2 |
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There should be a large red wire (+ positive) at that plug that comes from the blower fuse. Also a large black wire that is ground.
The smaller yellow wire is the control voltage from the A/C pushbutton. IF you measure voltages between the yellow & black wires then you will have from 1V to 6V, depending which blower button is selected. IF you check the voltage between the red & black then you should have battery voltage. All with the connecter pluged in of course.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
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Quote:
Thom
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1987 300E 1967 Jaguar E-type Series I, 2+2 |
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An Update
I finished diagnosing the blower moter and was reasonably satisfied with the conclusion that the blower motor itself needed attention and not the switches or the regulator. I disassembled the cowling taking the windshield wiper out first. Thanks for the article in the archives that showed the step by step process, what a lifesaver. I then got the blower moter out fairly easily. I applied voltage directly to its leads and the motor did nothing. I then noticed that the brushes were worn right down to the nubs. Just for kicks I stick a small wire down into the cage that holds the brushes to see if I could jiggle them into contact with the armature. I then applied power to it once more only this time the motor revved like a demon. Success. Now to get those damn brushes out. Onward we go.........
Thom
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1987 300E 1967 Jaguar E-type Series I, 2+2 |
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Finished
I went downtown this morning to search for brushes that would fit this beast. I found them on the first try at an electrical supply company. I asked them how much I owed them and the manager just snickered and said to take them off his hands, he really needed to get rid of this old inventory. I then went home and fitted the brushes which were remarkably close in size but did need filing to fit just right. They worked great, the motor ran like new. I tried moving the armature of the motor from side to side to see if there was slop in the bearings but couldn't find any. Later this evening I finished the job by re-installing the windshield washer motor and assorted peripherals. I estimate that I saved about 500 bucks by doing this myself. When one figures the cost of the new blower motor ($250.00) and labor (!!!!!) then I guess I'm coming rather close with that figure.
Thom
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1987 300E 1967 Jaguar E-type Series I, 2+2 |
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