How do I replace a burned out headlight bulb on a 1990 Volvo 740 Wagon?

The bulb is burned out, but there is nothing wrong with the casing. Do I have to replace the whole unit or just the bulb?How do I replace a burned out headlight bulb on a 1990 Volvo 740 Wagon?you should be able to replace just the bulb part of it, go to the back of the light and twist off the lock ring and remove the bulb,don't touch the new one with your finger tips though the oil from your skin will make the bulb have a shorter life span,take your time with it,its not a bad job to do good luck.How do I replace a burned out headlight bulb on a 1990 Volvo 740 Wagon?your very welcome.

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