Compression Ignition Addict
Join Date: Feb 2014
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Cold start problems are almost always either the glow plug relay (the usual case), or the actual glow plugs (less often). The relay is a dead simple fix (put in a better relay).
Also, they're not actually needed to start the truck as long as it's not below freezing (ish).
If it runs solidly and has no issues when warmed up, there's very likely nothing wrong with how it starts either. Worst case, it'll take a few cranks to light up - mine did that when I got it, and I found the glow plug relay completely failed.
But if it's the guy's daily driver, I don't think you're likely to find too much wrong with it. You should ask about coolant anti-cavitation status, though. It's a commonly neglected item that can do major block damage if ignored.