thanks for all the help! my plan was to replace the cracked rubber fuel lines while i had it off as well.

Now a new problem has popped up

i didn't mention it in the original post, but the driver's side vent blow hot. i have plans to clean out the duo valve and i think that will fix it because i smacked it with a screw driver handle and it stated blowing cold.

however, my wife reported today that the floor vents are air so hot she felt like it was burning her feet. she also said the left side center vent was cool not cold for a bit.

any suggestions? i did a quick search and came up with vacuum connections as possible culprits?

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'92 300D 2.5
'99 E300TD