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Don't cut corners Posted by sam96CS [Email]  (#852) [Profile/Gallery]
(more from sam96CS) on Sat, 25 Jan 2014 18:59:40
In Reply to: Sometimes I Overlook The Obvious, robert morgan, Sat, 25 Jan 2014 11:09:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Do not buy any thermostat that will fit the hole. Get the genuine Saab item if available or the Motorad 265-192. Several people have had success also with the Wahler brand. Install the new thermostat with the air hole in the "up" position so the cooling system can burp itself.
Here are relevant comments from a site that sells Saab parts:
Saab thermostats are special. They have a three position operation. the first position is full closed and it blocks all flow to the radiator until the engine warms up. The second position allows flow both to the heater core and the radiator to provide cabin heat and cool the engine. This is the position the thermostat should be in most of the time while driving. The third position of the thermostat allows full flow to the radiator and blocks flow to the heater core as the plate on the bottom of the thermostat blocks the passage to the pipe to the heater. The thermostat reaches this position when the engine is nearing overheating and allows coolant to flow directly to the most efficient heat exchanger, the radiator. The heater core is bypassed because the heater valve has bypass circuits in it and is not exposed nor has the flow capabilities of the radiator. This allows for maximum cooling of the engine when it is needed. Aftermarket designs usually do not incorporate these three positions, only two. The biggest complaint from people who use incorrect aftermarket thermostats is no heat after the car warms up in the winter.
If you have a cooling fan stuck in the on position so that it never stops running that can also prevent the cooling system from warming up. Make sure you fix the right problem rather than throw parts at it.
, Sat, 25 Jan 2014 10:37:33, Sat, 25 Jan 2014 18:59:40 <-- Viewing This Message
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