Quote:
Originally Posted by mback12000
NOOOOOOO!!! Do NOT apply extra force. The cap is not opening because it locks under system pressure. Wait for it to TOTALLY cool down. Also, if you look next to the cap you will see the system air bleed. Use a straight screwdriver and CAREFULLY crack it open a bit it to bleed system pressure. If the cap isn't opening easily stop before you break it.
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the cap does NOT lock under pressure in any car's cooling system. if you open while hot, the coolant will come gushing out and there is a possibility to get burned if you dont use a rag/towel. (best to open while cold) the bleeder screws intention is not used for what you're describing and it would be impossible to crack the cap as long as you're loosening (turning left) it.