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Q: why would i have no heat and my temperature gauge not work on my 98 isuzu hombre on 1998 Isuzu Hombre

I just changed the water pump, thermostat and temperature switch because I had a leak and was told it was the water pump. I have no leak now but my heat is still not working and neither is my temperature gauge. WHY??? Please help
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Why , Because it wasn't diagnosed properly? Was the temp. guage working before? If so, make sure it's plugged in and no wire damage. Thermostat installed correctly , and system was allowed to warm up and purge all air out of system??? Air trapped in system will cause a no-heat condition sometimes.
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