Re: 9-5 Running Hot: Replace the radiator or just flush? - Saab 9-5 Bulletin Board - Saabnet.com


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Re: 9-5 Running Hot: Replace the radiator or just flush?
Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Sat, 23 Jun 2018 07:55:59

In Reply to: 9-5 Running Hot: Replace the radiator or just flush?, wabi-saabi, Tue, 19 Jun 2018 17:57:16
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After 17 years, the history is as important as the symptoms. *IF* the car has been on a continuous diet of its OE specified coolant (blue stuff), with the recommended change interval, I'd say the radiator probably isn't fouled. If the POs switched to green stuff, or if it had an uncertain change interval I'd say replace it: if the radiator is fouled, all your rinsing won't change anything. The Citric and Oxalic acid treatment is for coffee makers which are partly fouled with calcium buildup. Your radiator, if fouled, is plugged with silicate (from green stuff) or aluminum oxide (from lack of maintenance) and the fouling will prevent the rinse agent from getting into the fouled tubes.

Or it might be just a stuck thermostat or temperature sender. Easy to simply change them first, and if there's no difference (or an inadequate difference) then it's the radiator for certain.

As for the hose nipple(s) failing, you could always stress them, and if they were going to go soon, that would do it. You would know for certain. Obviously the stress test requires having an alternate ride or spare parts readily available...

Finally, the 9-5 temperature gauge reading is infinitely adjustable. Someone with a Tech II can set the temperature at which it comes off the bottom peg, the temperature at which it reaches level, the temperature at which it leaves level, and the temperature at which it hits the top peg. The factory setting has a fairly wide dead zone in the middle. It can run a little cool or a little hot and still sit exactly in the middle. I always recommend having it set so it reads actual temperature without dead zones. That way you can likely observe something beginning to fail.
It's what I had done for my '02 when I bought it.

posted by 98.28.165...

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