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Fix for Occasional Heat Loss at Idle
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Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Mon, 12 Nov 2001 10:23:34 Share Post by Email
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Revised repost:

Some noted partial/total loss of heat in cold weather, when in traffic and gage rises a bit, after engine's warmed up.

Did some cook-top testing, when I had the T-stat housing out:

1) With typical oem 88C t-sat, it opens at 193, and keeps gage around 1/2 up. In traffic, temp rises and fans come on at about 200F by oem fan switch. No problem. But if temp rises more (example fans not working right, or fouled rad) then t-stat opens more and closes off the heater loop at 15 deg (wahler) or 20 deg (waxstat brand), above opening point of 193F. These 'heater loop loss' temps would be 208F and 213F, both above the normal control range.

2) If you use the cooler 180F (82C) t-stat, then heater loop shut off is at about 195F-wahler or 200F-waxstat, and heat will be lost before fans cool coolant down in traffic situations. Situation is actaully worse than this, since in cold weather, actual fan kick-in temp can rise 5 degF, a bit higher on gage, vs summer operation. Old fouled rads make problem worse too.

xxxxxxxx Suggestions xxxxxxxxx

If cooling system is healthy, install the 'normal' saab 89C (192F) t-stat to work with OEM 92C fan switch, and problem should stop. This is best combo for cold winters.

If you must use the optional 82C (180F) t-stat, I'd suggest the 82C fan-switch for those with degraded radiators. There is an 88C fan switch that would work well with healthy rads, esp with the waxstat thermostat. Should have a source soon.


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