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2013 F-150 5.0 loss of coolant

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Old 01-11-2018, 04:51 PM
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2013 F-150 5.0 loss of coolant

I have a 2013 5.0 with 143,000 miles (original owner), zero problems, original plugs, oil changed every 3-4 thousand miles. Took a trip to Florida last week, towing the Corvette on a u-Haul trailer, cruised at 70-80 mph the whole way, no issues, got 13.0 for the first two days. Last day the mileage dropped to 11.0, this seemed to correspond with the outside temperature going from the teens up north to 45 once I got to Jacksonville. The engine temperature never went over the usual position on the gauge when driving, no overheat signs or symptoms.
The day after I got here I unloaded the trailer and popped the hood on the truck to check the oil level, I noticed the coolant recovery tank was almost empty, there was a puddle under the truck but I couldn't tell if was from mine or not, not obvious leakage under the hood. I ran it down the street 2 blocks to a local garage and they pressure tested the system with no loss of pressure or noticeable leaks, topped it off with water and I drove around for 20 miles and everything was fine.
The next day we did some sight seeing, driving around 75 miles, checked under the hood; empty recovery tank again! All the time there isn't any signs of coolant loss under the hood or overheating.
Taking it to the local dealer tomorrow to see if they can find anything wrong.

Anyone had this problem before on a 5.0 ??
Thanks
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Old 01-11-2018, 08:30 PM
fastback89 fastback89 is online now
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Water pump would be my guess
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Old 01-12-2018, 09:04 AM
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Water pump or the O-rings that seal the hoses to the plastic junctions. Those are notorious for failing and they only seem to leak overnight while the truck is sitting.

Oh, and change your plugs. It's a $30 job that takes 15 minutes.
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Old 01-16-2018, 11:19 AM
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Mystery Leak Found

Found the leak after the truck passed two different pressure tests, it was coming from the junction where the upper radiator hose connect to the upper bypass joint.
Seemed to be leaking mostly on cool down after the truck was turned off, than running under pressure. Had to order the part from Rock Auto which had the Motorcraft parts in stock.
Must be an wide spread issue, the local Ford dealer in Panama City, Florida shows the part on backorder until next month.
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Old 01-16-2018, 01:18 PM
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Yep...that's it. Except, you don't need the hose and all. You just need the $3.00 O-ring that dealerships usually stock.
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Old 01-16-2018, 01:36 PM
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Probably, but with 143,000 miles on the truck I figured it was a good idea to replace the hoses while we were at it and keep the old for spares. I tow a lot and having a breakdown while pulling a trailer is a really bad day when out of state.
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Old 01-20-2018, 09:46 PM
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Timely thread. I just bought a 2011 with 5.0, and I'm having exactly the same issue. My heart sank a little when I noticed the empty reservoir, but then I sighed when I didn't notice any on the oil dipstick.

Seems like a very common problem with these engines. Also right under the tank itself too. I can clearly see the drip from my Y connector when parked, but no issues when driving.

Can someone please post the part number for the O-ring, or complete kit?
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Old 01-22-2018, 08:03 AM
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Coolant leaks are extremely common. Mine, my cousin's, and now a buddy's 5.0s have all sprang coolant leaks in the last 30 days. The cold weather kills those O-rings. Thankfully it's a cheap and simple job to do. Although, my buddy says his is leaking near the coolant tank and he can't figure it out.

Most Ford dealers stock the O-ring. Just call them up and ask.
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