I have put in 2 thermostats and had the cooling system flushed and I have either no heat or poor heat. The temp gauge is also going crazy. It sometimes goes all the way over to hot and then goes right back down into the normal area.
I noticed a sending unit on the manifold with a heater hose coming off it. Is this the temp gauge sending unit and would it cause the car to do this? Thanks for the help.
 
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