Date: Sat, 29 May 1999 20:36:37 +0800 From: "Olivier Templeovski" <ollietnopsamo.com> Subject: Overheat
About a week ago I noticed the temp gauge on my '93 9000 CSE at 2/3. It's never previously gone above 1/3. I switched on the AC (to ensure the cooling fan was on) and it didn't get any higher during the rest of my journey (about 10 mins). Checked coolant level next day and it was fine - and temp has been normal until today.. The gauge again went up to 2/3 (quite suddenly). Didn't switch on AC this time and a few minutes later whilst parking at home I noticed a lot of steam coming from the expansion tank area. The gauge was close to the red (though not in it). Switched off and heard it boiling. It was also dumping water onto the floor (from expansion tank cap). I reckon about 1.5 liters was lost. The fan came on about a minute later (a tad late) so I'm assuming that the fan switch is at fault. Is it normal though for water to be lost from the expansion tank cap before it enters the red zone on the gauge? Could it be that the cap is faulty too or would a fault somewhere else in the system cause it to boil prematurely? More to the point how do Saab heads behave at high temperature? Is there any chance that it could have warped (it's cooling down as I write this). I also wonder if a sudden dump of water would cause the temp gauge to under-read (if there is not enough water in the head to surround the sender.) Any advice would be much appreciated - I don't rate the local Saab dealer very highly and would not be at all surprised if he mis-diagnoses it.... Olivier Templeovski '93 Saab 9000 CSE
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