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good point on the pressure drop, but I assume it would be a sizable leak to see a change in the pressure gauge and with a larger leak there would be coolant coming out of the Weep Reservoir opening.

The problem with a pressure test and watching the Weep Hole for coolant is that you have to fill the water pump Weep Reservoir first before seeing a coolant leak. This Reservoir is created by having the outlet hole on the "top side" of the coolant Reservoir freeze plug. . ( but what do I know...

Here's a link to a Mazda site that shows an example of the Weep Hole and its location on the Ford 3.5 L engine. https://mazda.oemdtc.com/598/engine-coolant-leak-behind-alternator-2007-2015-mazda-3-7l Cleon

I wanted to see the water pump Weep Hole that’s located behind the alternator, so I bought an Endoscope on Amazon. The brand name is Depstech and the Part# is 855-5M and the price is 28.99. This camera connects to my computer and allows me to see the Weep Hole on my 2017 Explorer, the hole looks...

Yes ! Our daughter is driving the 2012, the other day she texted my wife with an attached image of the car display that shows engine temp ( which looked normal—I think she inadvertently touched a button on the steering wheel ). I started to search coolant problems and found this link you...

Jon, I don't know if this dye is compatible with Ford's S-HOAT antifreeze. Lets jump down the antifreeze rabbit hole with these two links http://articles.sae.org/8242/ https://www.hemmings.com/blog/2014/08/01/tech-101-the-colors-of-antifreeze/ Talk about confusing ! Cleon

Jon, I'm not familiar with this product. One thing I did not mention on the 2012 Explorer is the coolant level on the tank, it's about 1.5 inches below the low level factory mark on the tank, this after 5 years and 100K, I assume this is normal. Cleon

If you’re buying a used car I would, Look at the oil dipstick for milky colored oil. Look under the oil filler cap for the same milky color. Shine a light into the oil filler opening and look for any signs of this milky colored oil. If there are no signs of water in the oil ( milky...