89-300ce
Me too I would rather recommend a thorough check than carrying all sort of parts. In particular pay attention to all the belt-driven devices such as: air pump, water pump, A/C compressor, belt tensioner, idler pulley, fan clutch.
Then I'd carefully check the coolant system and replace hoses and thermostat if they are of unknown age or look suspicious.
Very important as well is to check the ignition system, ie distributor and rotor, wires and coil.
Then I'd check the hoses from/to radiator transmission.
I got stranded thee times (300TE 1992): 1) rotor/distributor 2) lost transmission oil due to hose failure 3) air pump seized.
That was shortly after I bought the car used - I had no ideas about cars.
Bruno

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1992 300TE 160 kmiles