Doing a cold flush

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Dec 17, 2017 | 09:31 PM

namnguye

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Doing a cold flush

I am going through a complete proofing the engine. However, since I already removed stuffs, I can't run it. So I am doing as best as I can with the flush. At 80 mph empty, relative cold weather, the truck has at most 14 degree delta between EOT and ECT. That doesn't happen often. So it's still ok, but border line I suppose.

I drain the coolant with the radiator and the two bottom (left/right) bolts. The coolant didn't look dirty, but I am not sure that's scientific.

I then plug a water hose to the line next to the alternator to push out as much as I can. However, the water didn't run at all.

Is it because there is a valve right there? Is this a cabin heating line? If so, why would people put a coolant filter on this? Would it only activate if heat is turned on?

I am thinking of removing the vacuum activated valve and push water through. What do you think about this approach? Any hint or help?

I am planing to replace the oil cooler among other things.

Thanks.

Dec 18, 2017 | 05:08 PM

namnguye

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I took the valve out and tested with a water hose. It was shut. However, when I use my hand to move the actuator, the water moves. What's interesting is that it's open by default once it's loose. Not sure what that means when it's in the engine.

So I put it back and ran the water without problem.

I still wonder what's that valve is for. If it's for cabin heat, then it's odd people use that line for filtering.

Dec 18, 2017 | 06:45 PM

FiznUKa

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From: Salt Lake City, utah

That valve stops the flow of coolant going to the heater core when the MAX A/C is on to help keep the cabin a little cooler.

Dec 19, 2017 | 10:16 PM

namnguye

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thanks, I just found out before you posted but didn't have a chance

to reply. It's one of those brain dead moments. Somehow, my head was thinking the filter was "inlined", not branching out. When I realized the connection was on the high pressure side of the valve and it was branching out, not in-line filter, it's obvious.

Thanks though.