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1998 Mercedes-Benz E300 Questions

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When I use my blinkers all blinkers light up like the hazards are on
drivers door or rocker panel. how do i drain it out ?
This happened about a year ago. Shortly thereafter, the "check engine electronics" sign appeared. Now, it never goes away. Have taken it to three repair shops and they don't know why the light turns back on. Actually, I didn't realize there might be a connection between the accident "check engine electronics" sign suddenly appearing until I saw a somewhat similar comment posted here.
There is some fuel leaking around the plastic low pressure lines, still running but need to fix soon. I've heard this is a common problem, but am afrid to attempt without some help.
The window switch console works intermittently. Consequently, I can use the switch to lower the windows from the cluster switch located on the auto trans shifter panel. Can this cluster switch be serviced? Are there points in the cluster that can be cleaned/serviced? I can purchase a new instrument cluster for approx. $600.00 or replace with a used one for $100.00. Please advise. Thanx.
I have a 1998 Mercedes E300 TD with 245,000 miles. The a/c unit puts out really cold air for awhile and then blows warm air. This does happen more when the temp outside reaches 80 degrees and up. It also seems to happen more when I am in stop and go traffic.

When it blows hot, I can turn the engine off for a couple of minutes and when turned back on the a/c is really cold again.

I have read the evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not cycle on, the AC system will not blow cold air. If the AC compressor is stuck on, the air will be very cold at first, before warming up.

Can I change the evaporator temperature sensor myself and where is it located?

Thanks for any help.
how do I reset my oil counter?
when I took my car to change to snow tires, I was told that I needed to replace R Pinion Shaft Seal (rear both). How can I know I really need that and can you explain what it is.
Thank you!
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