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Thanks for the response.
It's possible it hasn't been cool enough for the pump to come on, I will pay more attention now that it's getting cooler here in SoCal.
As far the tube being clear. I've cleared it out twice over the last 14 years, engine now has 320K miles but I had the head rebuilt 30K miles ago and the tube was cleaned then too. And as I said, if I apply vacuum to the EGR valve at idle, RPM drops indicating that the tube is clear.
I'll do some more diagnostics this coming weekend and see what I find.
Thanks again!
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