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Q: When I try to start the car, it makes a whirling sound, but the fan turns. on 2000 Jeep Grand Cherokee

My car stalled at a service station. Jumped it off and it ran for about 15 miles, then died. Now when I try to start it, makes a whirling sound,but the fan turns. could this be a timing chain. If so how hard is it to repair?
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Its hard to tell what is wrong without hearing the noise first hand or be able to do some basic diagnostic tests. I wonder if you jump start the car and it will drive and now doesn't start could the alternator not be charging the battery. Is the starter cranking over the engine fast enough?
It could be a bad or unsecured battery ground cable between the battery and chassis or chassis and engine. Turn on the ignition switch to the on but not run position do you see an icon on the instrument panel representing a battery, if you do not see this battery icon the alternator is not seeing power to allow it to charge. Start the engine does the battery icon go out. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. If the engine can be got to start the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly.
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