Lots of possiblities, but I'd start with cleaning the idle control valve and checking for vacuum leaks.

You are probably going too lean warm (this can be the temp sensor, too) so the engine won't run. Hard start hot is also a symptom of over lean condition since there isn't enough fuel being delivered to get good igntion at cranking speed.

Don't adjust the idle mixture until you have found and repaired vac leaks, or it will promplty start running rich instead.

You may also have a bad coil that stops working properly when hot, but I'd start with fuel mixture.

peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!