My 2005 Honda Element has 288,000 Kilometers on it.
It has never been in a serious accident and never over heated.
[Well, there was one time that I was going very slow on a forest service road and discovered that it was running hot, a bit bogged down and slow, and that the fans were not working.
I let it cool, headed back down, replaced the fan motors, and topped it up with coolant and … everything was fine. It didn’t blow steam but it did go to hot on the temp guage.]
Step forward 1 year.
Now that it is winter, I turn the heat to Hot, and noticed a gurgling sound.
Gurgling only happens briefly when revving the engine.
It sounds like air bubbles caught or trapped or passing through the heater core.
Some people might not note it. But when revving after idling, it can be distinctly heard.
Purging the rad of air (put a funnel on it and burped it) helped.
I have the overflow at about 1″ to 2″ above the ‘MAX’ fill mark with no notable loss of coolant,
But it came back in a day or so.
So …. I took it to my usual mechanic:
– Pressure test (4 hours) and cylinder inspection revealed no leaks into the cylinders.
It holds pressure perfectly as can be told from the guage.
– Vacuum test (4 hour) revealed no leaks and it held a vacuum.
– A small leak in the lower driver side of the radiator is noted, perhaps 2 ml per hour of hard driving.
After all the tests, drawing all the air out, it ran quiet until I stressed the engine and then it came back.
Mechanic is at a loss to explain the cause – and he doesn’t think the small rad leak is the culprit.
I plan to replace the radiator.
What am I missing?
What is the mechanic possibly missing?
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