Coolant Mixing - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Coolant Mixing
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Posted by Ed B [Email] (more from Ed B) on Sat, 24 Jan 2004 17:41:00 Share Post by Email
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Hi all
I dont have a problem with overheating. Needle is at 7 o'clock when cruising and eight or nine in slow traffic.

However, the CEL recently came on and this prompted me to look inside under the bonnet which I haven't done in a while. Noticed that the expansion tank was empty. Also noticed some deposits/grime in the tank. I checked the manual and it recommended Saab Coolant. I was not able to get Saab Coolant at the motor store so I put in a liter of premixed coolant with Propylene Glycol - rather then drive the car and cause it to overheat.

My question is:

Is it bad to mix the propylene stuff with the coolant that was already in there? I don't know what it was but I presume that is was ethylene glycol as has been said by the people in the know on this site.

If I should flush it out then should I also put a chemical flush through the system beforehand?

Should I change the thermostat while I am at it?

Regards
Ed.
96 900 78,000 miles

PS the CEL has gone away.

posted by 159.134.167...

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