Re: unreliable temp guage - Saab 9000 Bulletin Board - Saabnet.com
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Re: unreliable temp guage
Posted by BobS (more from BobS) on Wed, 14 Nov 2001 13:38:03
In Reply to: unreliable temp guage, Nifty, Wed, 14 Nov 2001 07:33:51
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The temp gauge system and fan temperature control system are 2 different things. Either could be causing the different readings. The fan switch in the radiator senses radiator temperature, which can vary considerably from the engine temp due to ambient temperature, airflow over the radiator, coolant flow, etc. A poor electrical connection at the gauge temperature sender or a bad sender can affect the gauge reading. Also the fan switch is not the most precise item. One reason they put the fan switch in the radiator is overcome the wide on off switching points typical of these type switches. The wide temperature temperature swings of the cool end of the radiator minimizes the on-off charactoristics of the switch.
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