But if the thermostat has developed a defect and is stuck to open position, the coolant will continuously flow through the radiator and the engine may take a long time to reach its optimal operating temperature. When you start your 9-3 when the engine is cold, the thermostat cuts off flow of coolant through the radiator in order to quickly reach the optimal engine operating temperature. Thermostat is a part of the cooling system in Saab 9-3 which ensures that the engine reaches its optimal operating temperature as quickly as possible and maintain it under all operating conditions. There are flush kits available in the market that can help you do the job yourself. Flushing is done by pushing water through the outlet hose of the heater core and draining the gunk from the inlet hose. Recommended videoīefore you consider replacing the heater core in your 9-3, it is recommended to flush the existing heater core. If the coolant level is low, open the cap and pour some coolant into the tank until it is between minimum and maximum mark. ![]() You just have to locate the coolant overflow reservoir and inspect the level of coolant in it. Check coolant levelĬhecking coolant level in 9-3 is a fairly some job. The sound is most prominent right after you start the vehicle. Low coolant level or air in the heater core can sometimes cause sloshing sound from behind the dashboard when the engine is running. By filling and properly bleeding the system the heat should come back. Since the heater core is usually slightly higher, the air will accumulate in there first. If there is air trapped inside the heater core, the coolant will not be able to flow through it properly. When you turn on the heating, air gets blown through the heater core, warming the air in the cabin. The hot coolant is pumped through the heater core located behind the dashboard. The heating system in 9-3 uses hot coolant or antifreeze from the engine block to heat the interior of the vehicle. If the cooling system is not full and bled properly, the water pump will not be able to push the coolant around the system efficiently. Low coolant level or air in the cooling system can cause the heater to stop working properly in 9-3. So it's gone from (over) full when cold to the COLD marking when hot.1. I'll check again once it's cooled down and see what the level is like. Still have been unable to locate the usual culprit of the heater by-pass valve (but I'm not sure if MY2004 has one). Switch the heater to cool (ECON), and wait for the fans again, more bubbling in the expansion tank, which has now gone down to the Cold measure.Ĭar's been on nearly an hour and no serious sign of coolant loss, there's a small puddle (about a tablespoon's worth) which was dripping from a pipe low down behind the engine. With the heater set to full, I watched with baited breath the Coolant Temp gauge rise to half-way, whilst getting gently warmed.Ĭoolant still full, no fans on yet, gets past halfway, and the fans come on (they're very quiet by the way).Ĭoolant still full, but a few bubbles from the small hose at the front. Opened up the bonnet this morning and still full. ![]() Had topped up the coolant on Wednesday (2nd time), and it was full.
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