Car won't start when cold, Volkswagen passat

on the engine block next to the left engine mount.

You may have a sticking idle speed control valve.

Is it auto?? Needs to know you are not starting car in gear

Your brother's mechanic may be correct but you may want to double check if you have a bad flap which opens / closes the access of coolant thru your heater hoses to your heater core. This component is called an actuator which may be defective.

cud be the switch or somethin lodged between the motor-try vacuuming-dont keep tryin cause motor will draw more amps

First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM. Then the EPC (Electronic Pedal Control) yellow light will turn OFF.

have you checked all the hoses for leaks as well as radiator? Yes a water pump may be the cause and can be done by a do it yourselfer depending on your skill level.

double sided tape and bluetac worked for me!!

HI,
Passats can be reset if the radio is pulled out and the fuse on the back is removed. Wait for 2 mins, reinsert the fuse and turn the radio on. If this doesn't work, please take it to the dealer for the unlocking of the code, for which he may charge you some fee.

Do let me know if it was helpful.

Regards
Kanu

www.vw.ddsltd.com