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

by in Memphis, TN on November 03, 2012
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2 answers
ANSWER by , November 03, 2012
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.
ANSWER by , November 04, 2012
possible air in system; possible broken/disconnected CTS or wire.