Ford Mustang Forum - View Single Post - Help with 2002 Mustang V6 - Possible Alternator Issue
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post #6 of (permalink) Old 12-13-2010
Silver J
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Joined: Jan 2008
Location: Nanticoke
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If the temperature in your car goes from blowing hot to cold, then I would lean towards the heater core (or some other part of the A/C).

A bad thermostat would cause overheating, as David suggested.

And an O2 sensor would affect your mpg, or nothing at all, depending which one. Like Snackmaster said, get any and all of the "error codes" read at a local auto store and post them up here. We can better diagnose your problem(s).

FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
STYLE: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs
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TIRES: BFG KDW/2 245/40R18 front, 275/35R18 rear
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