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The relay he changed was the fuel pump relay ~$25 part. It's good to have a new one. Here's what you need to do:
Open the hood all the way up and remove the battery and plastic shield behind the battery. Use a socket set and remove the OVP relay. This will be on the right side behind the battery located next to the cars main electronics hub. Detach the OVP by removing the screw and prying the harness off the relay.
Post here what the model number of your part is. The old faulty part is 000 540 52 45. If you have that number on your OVP, it has to go regardless. New part number is 000 540 67 45. The OVP is about $60 online and $90 at the dealer. You're not getting current to your fuel pump, because the OVP is not sending it from the battery. Trust me on this, I just went through it all with my '95 E320.
On the other issue, did the mechanic run the heater on the climate control after the new coolant was added? I always do this to get coolant all over the system. You can end up with an air pocket otherwise... I have had cars run too hot if this isn't done... Your car should have an 87 degree C T-stat. Check that he didn't use a higher value one...
Make sure he didn't use green coolant. You need clear coolant Zerex G-05. It is made to protect aluminum components. If you have the green, it needs to be flushed and replaced.
-GH
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