2013 F150 5.0 FX4 - 145,000 miles - over the past couple months I have noticed my engine running a little hot some times. What went from missing a little coolant and adding some every once in awhile has turned into every 10 days I have to add about a gallon to get it back to the correct level. A mon…

Did you check the transmission fluid for coolant contamination? Tester

If the engine sucks in 1 cubic millimeter of coolant on each stroke in one cylinder, it would take about 21 hours of run time to remove one gallon. If a gasket breach pulls in 10 cubic millimeters per stroke, that gallon would disappear out the tail pipe in 2 hours. This assumes you average 3000 rpm…

Probably a bad gasket. Whether it’s lower intake or head gasket. If it’s a head gasket, white smoke will likely be blowing out of your tail pipe. If it’s lower intake gasket, you’ll notice brownish oil. Good luck.

If it’s a lower intake gasket leak, you will have contamination of the oil without any combustion gases leaking into the coolant. Since the “block check” fluid changed color, we can assume that the head gasket(s) are defective, or there is a crack in one of the heads. A defective head gasket or cr…

Y’all are quick with the replies! Haha Jtsanders - incredible thought process on it. That definitely puts it in perspective. I appreciate that. Tester- I had my lead frame replaced in the transmission the other week due to a recall about the Output Speed Sensor shorting out and the dealer technici…

Some head casket leaks only leak when cylinder pressures go up under load like climbing hills or towing.

[image] HunterPach: Think it would be good to remove the spark plugs and check the cylinder heads with a bore scope? No, but it would be worth removing and inspecting the spark plugs to see which of them look different from the rest.

[image] HunterPach: Think it would be good to remove the spark plugs and check the cylinder heads with a bore scope? I have done that after pressurizing the cooling system for an hour to look for drops of coolant that has seeped passed the head gasket.

[image] HunterPach: You can definitely smell coolant once the truck has been running a good bit. In that case, your company’s mechanics may not be very good If you can smell coolant, and these guys can’t find the cause of the problem . . . :frowning_face:

Unfortunately it’s not company mechanics - they would probably fix the issue but they sub all the work out to vendors like Firestone, Pep Boys, etc… I usually use Firestone just because I’ve had good experiences with them so far over the past year I started using the program.

Coolant Disappearing - No One Knows Why

Maintenance/Repairs

VOLVO-V70 August 2, 2020, 1:47am 12

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Coolant Disappearing - No One Knows Why

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