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

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers
possible air in system; possible broken/disconnected CTS or wire.
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.