RebelGT Posted April 26, 2003 Report Share Posted April 26, 2003 Just making sure, the coolant drain plug in the block next to the oil filter becomes the coolant feed correct? And does anyknow know what size fitting that is, and what size fitting the oil is as well would be handy. Quote Link to comment Share on other sites More sharing options...
brian89gp Posted April 26, 2003 Report Share Posted April 26, 2003 Well, on my 3.4 DOHC the coolat tap and the oil pressure sender are both 1/4 NPT, I'm assuming the TGP is the same. Quote Link to comment Share on other sites More sharing options...
RebelGT Posted April 26, 2003 Author Report Share Posted April 26, 2003 i think the oil is 1/4 inch, the coolant plug looked bigger though. Quote Link to comment Share on other sites More sharing options...
brian89gp Posted April 26, 2003 Report Share Posted April 26, 2003 On mine they were both the same. Something I found interesting though, a 1/4 NPT fitting is the same ID as a 1/2" hose. I would think that a 1/4 would be a 1/4. Quote Link to comment Share on other sites More sharing options...
RebelGT Posted April 27, 2003 Author Report Share Posted April 27, 2003 so can anyone tell me if its true that the coolant drain becomes the coolant feed? Quote Link to comment Share on other sites More sharing options...
Chris A Posted April 28, 2003 Report Share Posted April 28, 2003 Well, i'm not sure I can answer that as I don't have a coolant drain! But if you are talking about the coolant port about midway on the side of the block then yes it is the coolant feed for the oil cooler, and turbo. I posted a pretty lengthy description of the coolant system elsewhere so you may wish to do a search for it. Chris Quote Link to comment Share on other sites More sharing options...
RebelGT Posted April 28, 2003 Author Report Share Posted April 28, 2003 yeah, thats what i'm talking about, its the coolant drain plug for the block, next to the one for the oill Quote Link to comment Share on other sites More sharing options...
RebelGT Posted April 28, 2003 Author Report Share Posted April 28, 2003 i found your old post, good info, do you know what size fittings those are? Quote Link to comment Share on other sites More sharing options...
brian89gp Posted April 28, 2003 Report Share Posted April 28, 2003 1/4NPT x 1/2"hose Unless GM changed the block casting for the 3.4, which is doubtfull. Quote Link to comment Share on other sites More sharing options...
RebelGT Posted April 29, 2003 Author Report Share Posted April 29, 2003 i reached my hand down there and the plug felt bigger than 1/4 inch, heres a pic i got from someone on gmforums. Quote Link to comment Share on other sites More sharing options...
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