1999 Pontiac Bonneville Malfunction - Engine


Question: On my 99 Bonneville the temp gauge is creeping higher. Hasn't gotten over 200 yet but never used to run over about 150. During this same time period the volt gauge has creeped down. Again not enough to be a problem but still not right. I have replaced the belt (serpentine) with no change, the tensioner still feels good, had the battery and alternator tested, first it said the battery was bad and the alt showed 12.8 about 15 minutes later the battery showed good and alt 14. Any ideas and do ou think they are related or seperate problems occuring at the same time. Oh yeah, this all started right about we ad an ice storm I noticed it was very slow turning over shortly after that is when I noticed the gauges. The battery is a 60 month battery about 2-3 years old.


 
Technican: It may be time for a new thermostat, I assume it has never been changed. Are you saying the engine was running and the voltage only registered 12.8? Then fifteen minutes later the voltage climbed to 14? If the engine was running and voltage was 12.8 it was not charging, because 12.8 is considered normal voltage with the engine off. Did the engine ever crank slow again? Does it crank slow after it has been sitting overnight? Keep a close eye on the coolant level as these engines are known to develope a coolant leak in the intake manifold.
Owner: The first readings (12.8 & bad battery) was with the engine off the second set with the engine running. It only cranks slow when it is around freezing Itcranks fine in the morning but the volt gauge registers about 8 for a few seconds then it will kick up to 14. It will gradually come down as the temp goes up. No I've watched this closely for about 3 weeks now and the coolant level has remained constant.
Technican: Okay install a new thermostat and see if there is a change. You would actually need to use a thermometer to verify a change in coolant temperatures. Use a voltmeter and measure the battery voltage on a cold morning, or any morning for that matter (after the car has sat for many hours). See if the voltage is low. Alternatively, leave a battery charger on overnight (slow charge). Disconnect the battery charger before starting. Does the gauge react differently now (that you know the battery is fully charged)?

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