Coolant consumption

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Left Coast Geek

Full Access Members
Joined
Aug 31, 2023
Posts
189
Reaction score
70
Location
Mid Left Coast
My 2019 Expedition now has about 72,000 mi on it. I'm 7,000 mi into an 8000 mi road trip and it's used a gallon and a half of coolant. There's not a trace of coolant in the oil. There's not a trace of steam in the exhaust. There's absolutely no smell of coolant in the interior or under the hood, so I don't know where it went. I don't see any signs of Crusty coolant around Anything I can look at?

I've been driving in hot weather, towing a 5000 lb trailer up and down mountains, so this is not been an easy $7,000 mi. I'm currently in Durango, Mexico, and I've been all through the Yucatan and everywhere else in Mexico. I'll be home in a thousand miles, so I'm not really planning on doing anything about it until I get there other than keeping it topped off. At this point I'm just adding water because I don't have access to a car parts store where I can get the proper coolant grade. The first gallon I added was prestones proper coolant for a late Ford.
 

apex96

Full Access Members
Joined
Jul 11, 2021
Posts
253
Reaction score
181
Location
PA
I’m dealing with a similar issue, no visible signs of leaks and it’s been like this since the vehicle was new… at dealership now having torque converter replaced and they have added dye to try and identify where it might be leaking. My guess is it’s weeping from the water pump.
 

Mediamonkey11

Super Moderator
Staff member
Super Moderator
Joined
Jul 7, 2013
Posts
561
Reaction score
89
Location
Enumclaw, WA
Any chance your system isn't pressurizing due to a failed Rad cap, and boiling off during the time the vehicle is in motion?

Have you modified at all such as lower temp tstat? generally these leaks are either burned in combustion or only happen at load and are small enough they don't leave a trace as they are hot enough to vaporize instantly once they exit the system.
 

apex96

Full Access Members
Joined
Jul 11, 2021
Posts
253
Reaction score
181
Location
PA
Any chance your system isn't pressurizing due to a failed Rad cap, and boiling off during the time the vehicle is in motion?

Have you modified at all such as lower temp tstat? generally these leaks are either burned in combustion or only happen at load and are small enough they don't leave a trace as they are hot enough to vaporize instantly once they exit the system.
If no dye is found anywhere on the exterior surfaces of the hoses and block then yes, I’ll be changing the cap out for a new one. The cap theory has crossed my mind but I’ve also seen signs (very small colorful plume on wet pavement when left idling) that the water pump may be weeping as well. Will hold pressure on static test which has intrigued me as well.

Not sure if OP has seen similar tells on their vehicle.

As far as running a colder t-stat, yes I’m running a 170 and the housing is torqued to specs. Dry as a bone around the housing.
 

JasonH

Full Access Members
Joined
Nov 12, 2018
Posts
1,369
Reaction score
733
Location
Houston, TX
My 2019 Expedition now has about 72,000 mi on it. I'm 7,000 mi into an 8000 mi road trip and it's used a gallon and a half of coolant. There's not a trace of coolant in the oil. There's not a trace of steam in the exhaust. There's absolutely no smell of coolant in the interior or under the hood, so I don't know where it went. I don't see any signs of Crusty coolant around Anything I can look at?

I've been driving in hot weather, towing a 5000 lb trailer up and down mountains, so this is not been an easy $7,000 mi. I'm currently in Durango, Mexico, and I've been all through the Yucatan and everywhere else in Mexico. I'll be home in a thousand miles, so I'm not really planning on doing anything about it until I get there other than keeping it topped off. At this point I'm just adding water because I don't have access to a car parts store where I can get the proper coolant grade. The first gallon I added was prestones proper coolant for a late Ford.

Since you're traveling, try circulating dye so you can check when you get home. Common areas for coolant leaks are the water pump housing, turbo fittings, and the fitting on the degas bottle. Safe travels!
 

slow3v

Member
Joined
Oct 25, 2023
Posts
15
Reaction score
14
Location
USA
Betting its heater hoses. Check passenger side near the firewall where they connect to the heatercore, and down toward the front/left side of motor where the distribution block is. You can follow them pretty easily.
 

Jerald Cook

Active Member
Joined
Jan 21, 2021
Posts
25
Reaction score
26
Location
Kansas City
I had a similar issue with my 2020, disappearing coolant with no obvious signs. Turned out to be a leaky coolant tube to the driver's side turbo that was only found with pressurizing the system by the dealer.
 

BMW2FORD

Full Access Members
Joined
Jul 18, 2021
Posts
247
Reaction score
245
Location
CT
Don’t forget about the coolant lines to the rear heater core if you have that option. A lot of shops don’t think to look at the rear of the vehicle and easily miss that.
 
OP
OP
Left Coast Geek

Left Coast Geek

Full Access Members
Joined
Aug 31, 2023
Posts
189
Reaction score
70
Location
Mid Left Coast
Looks like it's dripping from a Y shaped hose on the passenger side of the engine... I'm hoping I can nurse it for another week and got an appointment at a Ford dealer in Phoenix AZ next week.

Currently on Playa Huatabampito....PXL_20240422_193234204.MP.jpg
 

wakeboarder

Full Access Members
Joined
Nov 16, 2019
Posts
770
Reaction score
437
Location
Fort Lauderdale, FL
Top