I am experiencing a very annoying problem: my car - a 1990 190E 2.6 - just break down after I drive it for 20 min or so.

Then, if I tried to re-start it immediately, it will crank but won't start. However, if I wait for 5 min or so to let it cooling down, then I can restart and drive it until it breaks down again when becoming hot.

I am suspecting the belt tension. I removed it a few weeks before to replace the water pump myself and might not set it back correctly. The battery light does come up very slightly from time to time and now the check engine light does light up too!!!

Could this be the source of all my problems? Do really need advices from experts here.

Thanks,
John Q.

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Tigger - 2001 E320