Still no signs of any leaks or coolant loss. I then put another 200 miles on the engine running errands, including two 30 mi RT highway drives and a 100 RT highway drive. Coolant level burped twice maybe 10-16 oz total. There was no obvious sign of coolant in the oil, the oil on the dipstick looked clean and clear, but the drained oil was darker than expected. Since finishing the LIM gasket job a few days ago, I ran a few local errands totaling less than 30 miles I suspect, then changed the oil and filter. Any suggestions on distinguishing the possible causes? Anyway, I'm wondering whether I need to prepare for another LIM job, or will need to go further and replace the head gaskets as well. I'm not sure if coolant entered the oil while driving it lately, or from my pressure testing. Coolant is running down the driver's side of the transmission bell housing. To find the new leak, this morning I pressure tested to 15psi the coolant system using a hand pump. Then the the engine started loosing coolant again. The water pump and bypass fixed the problem for about 800 miles. FWIW, the carpet was still dry, but the padding underneath was soaked. In January 2023 I started working on the problem and replaced the water pump and bypassed the heater core based on dye results. I have not driven it much since last summer. It was a slow leak until last summer, when it became really bad. The longer story: My truck has had a coolant leak for a few years now. I'm wondering whether I need to prepare for another LIM job, or need to go further and replace the head gaskets as well. It was fine 1000 miles ago, June 2022, when I last changed it.ΔΆ00,000 miles ago, I replaced the lower intake manifold gaskets. The oil in my 300k mile 1999 4.3L now looks like chocolate milk.
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