Switching coolant - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-07-2006, 02:20 PM   #1
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Default Switching coolant

I'm going to switch my car to regular green coolant when I fill the fluids when my L67 swap is done. Is there anything I should do, nothing has coolant in it anymore. I cleaned the Coolant overflow bottle, radiator, and radiator hoses. The thermostat, gasket and o-ring is also new. Did I forget anything??
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Old 01-07-2006, 02:51 PM   #2
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Doesn't look like you have forgotten anything...

If you want to stay longlife coolant, I have been using Prestone Longlife for the last 5 years in diffrent cars and have had good luck with it... Its Orange and is compatible with Dex... I don't think the Prestone is the same as the Dex... Someone correct me if I'm wrong..

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Old 01-07-2006, 04:25 PM   #3
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Not saying your wrong or anything...but why is this necessary?
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Old 01-07-2006, 04:30 PM   #4
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I just made that remark because I wasn't 100% about the makeup of the Orange Prestone Longlife coolant as compared to Dex Cool.. But it is compatible with Dex Cool..

He can use the Green stuff, I just wondered if he wanted to use the Long Life as opposed to the green..

I have the green in my 91, I have the Prestone Longlife in the 95 and 92 Mitsu... Been great in both... Thinking I may use Longlife in the SSE when I get it all back together again..

Chase will you be using Peak, Prestone or another Brand?

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Old 01-07-2006, 08:23 PM   #5
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Chasesmith

Did you flush out the heater core yet?
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Old 01-08-2006, 05:57 PM   #6
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Quote:
Originally Posted by ron350
Chasesmith

Did you flush out the heater core yet?
Yes, all parts except for thermostat are removed from car

Don, I will be using Prestone (on sale right now), but I will be using green stuff opposed to orange stuff.
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Old 01-09-2006, 03:22 AM   #7
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Don't know what the particulars are with your new engine, but if you go with "regular" green coolant, it will make a nasty passage-clogging brown crud if it meets residual Dex. So, if the new engine has not been completely drained by removing the knock sensors and/or block drains, and flushed, regular green could cause problems for you.

The safe thing is to go with the newer light green or greenish yellow coolants that will mix harmlessly with any type of antifreeze. Make sure it says so on the label.

My $.02
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Old 01-09-2006, 10:09 AM   #8
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Quote:
Originally Posted by bill buttermore
So, if the new engine has not been completely drained by removing the knock sensors and/or block drains, and flushed, regular green could cause problems for you. My $.02
I've had trouble finding block drain plugs in past on 93, 98, and didn't try on 03. Where do I find them? Are you saying that the knock sensors are actually in holes that drain the block!!!?
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Old 01-09-2006, 11:05 AM   #9
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Quote:
Originally Posted by imidazol

I've had trouble finding block drain plugs in past on 93, 98, and didn't try on 03. Where do I find them? Are you saying that the knock sensors are actually in holes that drain the block!!!?
For Series II engines, yes.
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