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Old 05-15-2010, 11:20 AM   #1
jeanne17
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Default Radiator drain/replacement and Thermostat Replacement

About to replace the thermostat on my daughter's 2000 sc2; also going to drain/replace coolant in radiator.

Any tips before I start? This will definitely be a learning experience. Not at this moment where I even start!

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Old 05-15-2010, 12:01 PM   #2
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1998 SC2
Default Re: Radiator drain/replacement and Thermostat Replacement

Use a STANT part number 14279 thermostat. That will give you the OEM setpoints. If you are planning on switching from DexCool antifreeze then fill and flush the system 3 or 4 times with water. When refilling use 1 FULL gallon of 100% antifreeze and top off with distilled water. Run the engine with the reservoir cap off until lthe fan comes on and goes off then top up the system and put the cap on.

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Old 05-15-2010, 02:38 PM   #3
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Default Re: Radiator drain/replacement and Thermostat Replacement

Thanks!

One small problem....the drain plug broke.

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Old 05-15-2010, 05:09 PM   #4
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Default Re: Radiator drain/replacement and Thermostat Replacement

Quote:
Originally Posted by jeanne17 View Post
Thanks!

One small problem....the drain plug broke.

This is not good. That usually means radiator replacement unless the entire thing is screwed into the end tank, some are.

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Old 05-15-2010, 06:59 PM   #5
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Default Re: Radiator drain/replacement and Thermostat Replacement

Quote:
Originally Posted by jeanne17 View Post
Thanks!

One small problem....the drain plug broke.
Bummer. If you're lucky you can find a fix. Which type of plug does the car have?

Regardless of thermostat or coolant type, I would do a very good flush of the radiator without the engine running, using the removed top hose and the radiator drain. By design it's next to impossible to get a good flush of the radiator since the outlet is so high up.

If you can't fix the radiator, but cautious of replacement brand. Quite a few users have had replacements fail quickly.

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Old 05-17-2010, 01:41 PM   #6
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Default Re: Radiator drain/replacement and Thermostat Replacement

I'd also suggest a 3/8" drive ratchet using a 10mm deep well socket, and some PB blaster.

the bolts are standard small headed ones, but the deep well will give you a small extension, which'll come in handy.

oh yeah, be sure to drain the coolant either through the thermostat hole or through the drain bolt at the bottom (the richpin video on t-stat replacement will show you this bolt). Just draining the radiator alone won't get all that coolant out.

...
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Date Obtained: 5/30/07
Status: Alive, 1/2 exhaust

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Old 05-17-2010, 09:22 PM   #7
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Default Re: Radiator drain/replacement and Thermostat Replacement

Quote:
Originally Posted by jeanne17 View Post
One small problem....the drain plug broke.
Exactly what broke? The plug itself is easily replaced.. radiator side not so much so.

Just for reference, a 1/4" ratchet is the perfect tool to open the drain valve.

...
1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh!
Purchased 114k 10/07
Added OEM CC

Last edited by off-track; 05-17-2010 at 09:29 PM..

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Old 05-18-2010, 07:40 PM   #8
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Default Re: Radiator drain/replacement and Thermostat Replacement

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Originally Posted by off-track View Post
Just for reference, a 1/4" ratchet is the perfect tool to open the drain valve.
IF you don't have the type that is more like a thumb screw. From reading here it seems that may be another thing that is hit or miss through several model years, though it seems the radiator other than the plug was the same.

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Old 05-18-2010, 07:48 PM   #9
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Default Re: Radiator drain/replacement and Thermostat Replacement

There are several different drain valve designs. The common denominator is that they are all easy to break. If you pull out on the valve stem while turning it the probability of breakage is reduced.

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