Answer
Jun 04, 2022 - 02:11 AM
Unfortunately, it's incredibly hard to troubleshoot issues online without being able to run tests of any sort. However, since you mention a leak "in the back of the engine, in the middle", I would tend to think the "frost plugs" might be leaking.
Luckily, you should be able to find everything you need to identify and repair the issue in this 1999 Ford Explorer OEM Service & Repair Manual .
Luckily, you should be able to find everything you need to identify and repair the issue in this 1999 Ford Explorer OEM Service & Repair Manual .