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Old 05-17-2007, 11:11 AM   #1 (permalink)
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Date registered: Feb 2007
Vehicle: 1992 300E 4-Matic
Location: NY/NC
Posts: 86
Two Fuses unknown (to me)

My A/C doesn't work, the compressor doesn't even engage. So I'm doing the normal troubleshooting and I read in the forum to check the strip fuse. While looking for that (still haven't found it) I came across what you see in the photo. The fuse on the right was missing, so I replaced it. It didn't make a difference in the A/C.

What are these fuses??
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Old 05-17-2007, 01:26 PM   #2 (permalink)
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Date registered: Dec 2005
Vehicle: '92 400CE, '83 500SEC, '98 S320
Location: Santa Monica, California
Posts: 197
Check your freon level. If you are low, the compressor will not engage.

And I don't think those two fuses are for your compressor.

BRIAN
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Old 05-17-2007, 01:40 PM   #3 (permalink)
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Date registered: Jun 2005
Vehicle: 86 190E 2.3 16V, 90 300CE, 93 400E, 02 Olds Aurora
Location: Seminole, FL
Posts: 1,393
I would agree 100% with Brian and add that the two fuses in the picture were never on either of my 124's. The strip fuse you mention is located on the shock tower. It's a black rectangle shaped box that is approx. 1/2" wide and 1-1/2" long. Larger wire in and out. The cap on the box is henged to roll open toward the engine. Look just to the outside of your strut mount.

This is a 30 amp fuse for your interior blower fan. (besides the one in the fuse box) Do your fans run, just no A/C? If so, then you are most likely low on freon and the pressure switch in the system is doing it's job keeping you from burning up your compressor.

Good Luck,

Jayare
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Old 05-17-2007, 01:50 PM   #4 (permalink)
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Date registered: Feb 2007
Vehicle: 1992 300E 4-Matic
Location: NY/NC
Posts: 86
Thanks. The fans do run. Is there a way to bypass the low pressure switch just so I can make sure the compressor is good? Or, it there a way to check the freon level?
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Old 05-17-2007, 04:43 PM   #5 (permalink)
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Date registered: Jun 2005
Vehicle: 86 190E 2.3 16V, 90 300CE, 93 400E, 02 Olds Aurora
Location: Seminole, FL
Posts: 1,393
By jumping the low pressure switch to make sure your compressor is good, will in fact make sure your compressor is bad. If you don't have a set of A/C gauges etc. and knowhow, then you are best to go to an A/C shop you trust or your indy. A system re-charge and check up is much less than a new or reman. compressor +++++

Good Luck,

Jayare
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Old 06-03-2007, 11:05 AM   #6 (permalink)
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Date registered: Mar 2005
Vehicle: 86,91 190E,86 300E
Location: California
Posts: 44
Add-on

Those two fuses might be add-ons. The 25 amp blower motor fuse in my fusebox cooked the pot. A local German car mechanic bypassed the box and put a separate 25 amp fuse fitting outside the box. This arangement has cooked a few fuses, which were not the blue type, so I'm not convinced it's a good remedy. Things got so hot so fast the other day that the fuse burst into flames while I was driving and started a fire on the hood insulation. Fortunately I had just gotten off the freeway. I can imagine what fanning those flames would have resulted in. It seems to me there is some sort of defective blower motor to continually blow the fuses on this. I am experienced with hot fuses burning fusebox pots, though. Not nice.
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Old 06-04-2007, 09:53 PM   #7 (permalink)
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Date registered: Nov 2006
Vehicle: 1993 400E 209000 miles
Location: Great Lakes
Posts: 438
fuse

the fuse is in the black box by that switch for the hood, its a snap together. Thats for the Fan. If its not getting cold that is a freon leak.
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