92 E 300 Computer? Starting and AC Issues
 

My girl friend has a E 300 and has trouble starting it and also the AC works sometime and not others. She says her mechanic told her it was a computer chip that is house in that box under the passanger seat. Says the part is 1200$.
Not sure what the part is called for real and how to get hold of a cheap one.
She really needs this car to work, but it isn't work over 2500$ anyway...would hate to spend 1200 on it.
Any ideas?
Thanks!

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