Radiator petcock location for '04 GXP - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-10-2013, 01:31 PM   #1
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Default Radiator petcock location for '04 GXP

I'm sure it'* there somewhere. Can some enlighten me?
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Old 10-10-2013, 01:38 PM   #2
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My Dad'* 02 Lesabre doesn't have one and I did a radiator in a 03 Grand Prix a couple years ago and I don't remember that car having one. I removed the front knock sensor to drain coolant.
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Old 10-10-2013, 01:52 PM   #3
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If you can't find one and your eco-friendly. Run to Lowes and get some plastic 1/8" tubing. About 5ft worth. Insert one end into the radiator and snake it to the bottom of the radiator, grab 5 gallon bucket and siphon it. Works for me.
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Old 10-10-2013, 01:56 PM   #4
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Quote:
Originally Posted by Mike1995 View Post
If you can't find one and your eco-friendly. Run to Lowes and get some plastic 1/8" tubing. About 5ft worth. Insert one end into the radiator and snake it to the bottom of the radiator, grab 5 gallon bucket and siphon it. Works for me.
Good Job, I'll try it.
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Old 10-10-2013, 01:59 PM   #5
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Oh, and once you do get about 1/2 gallon of coolant in the bucket, remove the upper rad hose/and thermostat from the engine, this will allow the coolant in the engine to flow back into the radiator. Otherwise, it gets siphon locked in the engine.
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Old 10-10-2013, 09:01 PM   #6
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After reading your advice, I realized our rads don't have the cap on them. It is on the overflow container. Remember, I have the N*, not a 3800 v-6. The rad must have a petcock or drain valve.
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Old 10-10-2013, 09:19 PM   #7
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Most of the GM/DELPHI replacement radiators do not have a petcock. They will have a opening for it but it is molded shut. I mention this because I pulled a GM OEM radiator with a petcock, and the OEM replacement radiator had the petcock opening sealed.
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Old 10-10-2013, 09:23 PM   #8
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This is the original radiator. Car only has 60K mileage. I just need to know where the petcock is.
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Old 10-10-2013, 11:16 PM   #9
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I don't know why GM stopped using the petcock in the early 2000'*. It'* been a while since I worked on a north star but I'm pretty sure there is a plug in the block into the coolant passages. I have a wide funnel I use and usually pop the lower hose off and try and catch as much as I can. It is frustrating cause it'* almost impossible not to make a mess.
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Old 10-11-2013, 09:29 AM   #10
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Quote:
Originally Posted by 75 racer View Post
I don't know why GM stopped using the petcock in the early 2000'*. It'* been a while since I worked on a north star but I'm pretty sure there is a plug in the block into the coolant passages. I have a wide funnel I use and usually pop the lower hose off and try and catch as much as I can. It is frustrating cause it'* almost impossible not to make a mess.
The problem here I see is the radiator hoses attach 1/2 way up the core on both sides. I heard on another forum that there is a 19mm plug
on the drivers side. I'm still looking for it. Just short of removing the radiator to drain, i'm not sure what to do.
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