ok , my 05 about a month and a half ago did not have any heat in the cab ? and when I shut the truck down it puked out the over flow tube a little ? so I checked it out and it was air locked in the cooling system , pulled the vent plug there was no coolant ? primed it and filled the reservoir with about half gallon of coolant , all good lots of heat etc , normal operating temp. So today same thing happened air locked in the cooling system again ? no heat inside , did not over heat or anything , primed it out again back to normal . so what's causing the air lock issue ? truck is all stock . help I don't understand what's going on ?
LLY: 05 d-max coolant issue
- Thread starter butch2000
- Start date
Sounds like a coolant leak, possible head gasket failure, coolant tank cap or egr cooler failure. Look around for coolant leaks. Check all hoses, radiator, fittings, and water pump weep hole (bottom of engine near power steering pump) if no visible leaks try a new cap, they're cheap. Still doing it time to suspect combustion gases making their way into the coolant system. Easiest way is to look for excessive coolant system pressure on a cold engine.
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What do you mean by air locked? All cooling systems build pressure. If you open them right after you run them air will come out and maybe coolant if you open it too fast.
There is a simple way to test for this. Some type of fluid that responds (by changing color) to the combustion gasses in your coolant. Had it done on my truck awhile ago by a buddy.
It works great on gas engines but the fluid doesn't respond nearly as well with diesel combustion gases. At least with the fluid I've used the color change is tough to see. If you start and idle a cold truck and it builds coolant system pressure in a few minutes with no load it all but guarantees head gasket failure.
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