I'm not sure how simple it is on a Metro, but change your thermostat...it's a cheap part that is usually a 10 minute job which will save you A LOT of trouble should it decide that being open when heated is no longer the thing to do. I was lucky it only cost me $400 for a head gasket on top of a timing belt change which needed to be done anyway, got both for $1,150. It easily could have cost me the engine were I not farting horseshoes that day.
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