99 E300. Just replaced coolant, and radiator. Air in the cooling system now I think. Here's the weird thing, I have heat. I revved it for a minutes straight with the cap off and heat on, no bubbling. About 2500RPMs and various lower RPMs.

Top hose and lower hoses get luke warm if warm at all. Car doesn't get up to temp. Any ideas? SHould I jack it up on stands and rev it? Is there a bleeder valve for this car?

Only thing else I can think of is a thermostat. It was fine prior and car heated up accordingly. I have one if I need to try and replace it.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k