eGuru

There are no external signals that affect the rear view mirror dimming functions. What year/model did the replacement come from - pinouts may be different.

Look for a tilt switch near the firewall on the driver's side. Does the rear dome light come on when you open a door or is it burned out?

What else? I assume you replaced the airbag (with a new one? from a recycler?). What is the symptom - error message? Are you expecting to find a physical "reset" switch?

You haven't told us make/model/year of your vehicle.

After you find it, what are you planning to do with it? What symptom are you trying to correct? Did you have a collision that caused the airbag to deploy?

Hi FXT. Are all these symptoms being reported by ForScan or are you making measurements with a DMM? Have you examined the connections/wires at the rack for corrosion damage - especially since you mention that the problem first surfaced during wet driving conditions. There are many pin-point tests that can be performed using only a DMM but they would require significant amount of effort on your part. Unfortunately I am in the middle of moving to a new house and don't have access to the documentation to perform the tests at this time. It will probably be a week before I will be able to dig them out. In the mean time, keep us updated and good luck.

There is no separate fuse for the indicators. Sounds like the instrument cluster is defective. You can get a replacement at a recycler, eBay, etc but you will need to have a dealer perform the installation as programming is required.

Replace the ETB and definitely stop using the seafoam.

I am not understanding your post. Are you saying that cooling is fine but heating is sometimes insufficient? Is the air flow consistent?

If you haven't installed the CAI you can probably sell it at a better price and save yourself the labour. These CAI's are no better than stock and in some ways worse.

What are the symptoms of your failed steering system - failure codes, etc. Absolutely, a failing 12V battery will cause all kinds of issues. 10.x volts is definitely a bad value. If the battery is over 3 years old - just replace it. Don't bother to have it "tested". If your battery is newer, invest in a DMM to get a proper voltage measurement and help with this and future diagnosis.

Who is telling you that an alternator can be rewound to produce more current? The rectifiers would need to be replaced and would need improved heat sinking - something that the existing shell can't accommodate. The PCM software needs to be matched to the installed options.

If the connector or wiring has been damaged then a new rack wouldn't solve the issue.

If the ebay picture is similar to yours and it says it is for 2010-2012 Fusion in the ad, then it should be fine.

This is not the best video but you will see how to access the switch. Buy yourself some plastic panel removal prying tools. You can get a set for about $10. Don't use a screw driver. https://www.youtube.com/watch?v=60gXAz3gDJE&ab_channel=Nickthecarguy