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Installing block heater on a 98

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I bought a factory block heater, but I did not come with any documentation or installation instructions (stupid me). I know they usually install in a freeze plug. Can anyone let me know where the best spot is to locate this sucker???
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Resident asshole
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On a 4A-FE with a Defa you take out the number 4 cyl freezeplug behind the manifold and then put the blockheater on there so that the connector points downwards. I suppose it would be the same on 7A-FE not 100% sure.

Getting the freezeplug out is tricky :D
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