Well, they scale up if you don't flush them out every other year. Scales plug and/or can damage the core.

It's often neglected, - it just is lol. Fortunately, I've kept up with mine and haven't had a coolant problem, -ever. So it does help to flush them out once in awhile. My 98's @ about 300,000 miles.

 

I drained the coolant and flushed water thru the system and filled back up with ford coolant about a year and a half ago. I dont know if that counts as a "flush" or not I tinkered with the truck for a while last night. The "mist on the windshield" problem stopped and the smell isn't as bad but theres still a slight odor. I was feeling the hoses going in and out of the core under the hood and neither leaked. I did however notice that the return hose was much cooler then the supply hose so i suspect the core may be clogged. Also no moisture on the floorboard but i noticed my coolant level in my reservoir has dropped a tiny bit.

 

Yea, it's probably finding it's way out. Look behind the alternator down in the block cavity. See any coolant on top of the block ? That's a common area to leak under pressure. Along with behind the passenger head, -only under pressure. With the core like it is, -partially plugged or plugged, you can get spikes, hot spots and so forth. In quite a few locations.

 

No coolant on the engine anywhere i was watching for that last night as well. I need to get a pressure tester kit

 

jbrew...where can you get the Visteon/Motorcraft coils now???

 

Hey. I ain't the ol' Brewsky but ...

RockAuto maybe?

*EDIT* - yep, just checked - MC DG508 going fer $43 Canuck Bucks

 

Here and there...

Okay, here -

http://www.amazon.com/Visteon-Igniti...=5336118841-20

These are Visteon/Motorcrafts.
_____________________________________________

And there -

http://www.ebay.com/itm/FORD-MOTORCR...item3f138e7882

Those are true Motorcrafts, - thru and thru.

Any of those are the best I've seen for the money. As far as OEM standard and a VERY good deal.

 

Alanisdeals on Ebay is selling Visteons now. 8/$179.99, both DG508 and DG511 replacements. Visteon is European Motorcraft.