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Discussion Starter #1
i have a 91 DeVille, 4 door, 4.9L, i did the complete tune-up, also changed radiator and thermostat(190), in the summertime, heater warmed up, now that its cold it don't get hot,, would i have have to repurge the system or what.......i did do a complete flush even the heater core,,,,,what could be my problem
 

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White Diamond '03 DHS (with DTS floor shift)
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Any air in the system should have purged by now I would suspect. Did you replace the "T" fitting?
 

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Discussion Starter #3
since i don't know which "T", probably not, but i did have the heater working a couple of months ago..., where would the "T" be located at!!!!
 

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White Diamond '03 DHS (with DTS floor shift)
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Just follow the heater hose. It will lead you to the "T". If you haven't fooled with it or replaced it, it is not the problem.
 
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