Cadillac Owners Forum banner

Please help. Northstar freeze plug.

97399 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.
Not open for further replies.
1 - 9 of 390 Posts
I don't know if the crossover manifold has to be removed or not, but pray that it doesn't. It's very labor intensive.

I thought these things didn't have freeze plugs. :hmm:
Yes you should. It's a bitch of a job.

I don't know if it is accessible through the water pump opening. If it is, thank the Northstar Gods.
Yes, the dealer price is high. Mine was done under warranty and they had the car for a day. I don't recall the price, but it was high. Well over $1000 I think.

I'm not sure what exactly is involved with it as I have never had to do one. Johnny Kannapo did it not long ago. I'll ask him to chime in with some advice.
Maybe I should clarify post #8. When I said Johnny did it not long ago I was talking about the crossover manifold. I forgot about the freeze plug.

Check the Tech Tips section. You may find a tutorial in there.
The green silicone hoses on the crossover. They are more heat resistant and you do not want to have to replace them again in the future due to their inaccessibility.
Yeah, a PM or use the contact at the bottom of his posts. [email protected] ph: 800-RIPPY-22
Guys, I do not want to get in the middle of this and am certainly not going to take sides. You have both stated your versions of what happened. Neither of you will change your opinions. "I said", "You said" can go on forever and accomplish nothing. I would suggest that this thread has run it's coarse and would probably be in everyone's best interest if it was put to sleep since the transaction seems to have been terminated and a refund has been issued.
I think both sides have been well stated. I hope everything works out well for you both.
:nuffsaid: :closed:
1 - 9 of 390 Posts
Not open for further replies.