Engine temp drop at highway speed - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Engine temp drop at highway speed
Posted by Tim (more from Tim) on Sat, 13 Nov 2010 20:01:43
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I was just about to replace the thermostat due to engine taking a long time to warm up (see my previous post; thank you for the suggestion on thermostat) . . . now I noticed the engine temperature indicator would actually drop from middle to 1/4 towards "cold" when it was 40F out in the evening today and I was driving at about 65mph on highway; all cabin heat turned off. The indicator warms up back to mid-point within a few minutes of getting off highway and 25-30mph local driving. Is this also due to the thermostat? or am I looking at something more serious? Any harm in running with coolant temperature too low? Is there any way I can test the thermometer itself and make sure the engine/coolant temperature indicator is working correctly? Thanks in advance.
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