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As one final check I performed the “bottle test” today and it passed...no bubbles from the coolant overflow hose.

I ordered a new thermostat and gasket, will flush and clean the system during the change. Will report back with results.

So what is my next course of action? The coolant is definitely frothy. Was thinking drain and fill with water and a few cups of purple power to clean things out, then drain and fill again with water, then drain and fill with 50/50 anti freeze.

I also spoke with the previous owner today about this issue. He said he had tried to change the thermostat, but had abandoned the project when he couldn’t find one to replace it with. He said he also got oil in the cooling system from the transmission cooling lines that run through the...

Finally got some more time to trouble shoot today. first thing I did was drain about three quarts of oil out to look for water. Did not see any. Next i I used the radiator pressure tester and pumped the system up the 15psi. The pressure held pretty good this time. I then tilted the cab and...

All excellent ideas. Will give it another go tomorrow using the recommended techniques. I’m a little leary of continually pumping coolant into the engine while running around with soapy water looking for air leaks though. Was also told the water pump gasket likes to leak allowing air to enter...

Let coolant stand overnight, but I don’t see any discernible oil in it. Today i rented a pressure tester and pressurized the cooling system to 15psi. It does not hold pressure, and slowly decreases to zero over a ten minute period. No visible coolant was leaking from hoses or block or...

Yes, that is what he says in the video. Fuel pressure is 100psi while running, so fuel moves into the coolant. When shut down, coolant is 15psi still, so can cross the other direction, although this is more rare. I definitely don’t smell diesel though. I’m thinking it is oil. Been reading lots...

https://youtu.be/_DKJYkXQ6pU Found this adept ape video of a failed injector cup getting diesel in the coolant. My coolant doesn’t smell like diesel though. ..not yet anyway. I drained some anti freeze into a bottle and will wait for things to settle out.

Ronmar i will fill a clear jug with some coolant and let it sit overnight. Will report findings tomorrow.

Will check the trans dipstick tomorrow to see where we are. I haven’t checked that yet. I believe I checked the eng oil level correctly, it was cold both times. I haven’t been driving the truck because it won’t pass inspection because of a busted windshield. Now I’m actually afraid to drive it...

Fuel tank is crystal clean. when I feel the coolant with my finger it has a jelly type consistency. Would a radiator pressure tester tell me anything? I can rent one from Napa.

Will check the fuel tank and report back. The coolant level hasn’t risen or dropped, but my engine oil has decreased three quarts over a four hour drive at 50 mph. No strange smells in the coolant overflow. No blow by at the oil fill cap or steam rising out.

Can someone help me diagnose what is going on with my coolant please? Just bought this truck last week. Drove it home almost four hours. When I left, coolant was clear and normal looking. Oil level was full when I left, when I got home it was about three quarts low. I am now seeing this white...