Need help with vauxhal corsa 1400. electric thermostat, switch. PLEASE?

Question:
going to take the switch that operates fan, out to replase. will have to drain system, as switch is almost at the bottom of radiator on the left as you face the car. is there any thing that i should know before doing this job? also is it straight foward to top back up. and how to judge amount of water needed. can i just measure amount i take out. SORRY so long winded hope to start as soon as i get some serious answers. ALL HELP GREATFULLY RECIEVED> nik

Answers:

Does anyone know the firing order for a 1981 chevy p/u?

<>First off, disconnect your battery, then disconnect the wires from the switch...these switches are often always-hot so they can turn the fan on any time. Spray the switch threads with some WD-40 or other penetrating oil while you drain the radiator using the normal draincock (don't forget to remove the radiator cap or it won't drain completely!). You can rough-measure the drainage so you know how much to put back (it usually runs between 3-8l. Then remove your switch GENTLY so you don't strip the threads or bend the radiator. Replace your switch, close your draincock and fill 'er up!

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