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Please help. Northstar freeze plug.

97400 Views 389 Replies 26 Participants Last post by  Ranger
Hello guys. I have a 2001 Seville STS, a freeze plug (core plug, welch plug) fell out. The plug is (was) located on the rear of the left cylinder head, left front corner of the engine bay, behind the water pump housing. I can't upload pics because I'm posting this from my phone but even if i could it would be hard to see the hole, it is barely visible, it's somewhat blocked by the water pump belt as well as the housing (have to look very closely at a strange angle). I have already bought the new plug, but how do I access the hole to install? Does the entire housing have to be removed? If so, how involved is this going to be? I've already removed the air filter box/ducting, water pump belt shield and disconnected the hoses from the housing.

Any help would be greatly appreciated. Thank you.
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As an owner who has done the coolant crossover removal with the engine in the car, a word of advice: Get a ratcheting box end wrench in the size that the crossover bolts are (I think 13mm). It WILL save you at least an hour's time in removal and an hour in reinstall. at least 4 of the 8 bolts on the crossover are too tight quarters to get a socket on.
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