Could it be that you didnt bleed the system correctly... some new vehicles the radiator cap is lower than the thermostat causing an air pocket... you have to bleed this out... if there is a sending unit next to the thermostat housing pull it and see in antifreeze comes out.
also did yo put the thermostat in correctly ?
did you add almost 3 gallons of coolant and water ?
SOURCE: 1992 Toyota 4Runner, overheats, radiator,upper
Thanks for choosing FixYa and welcome to the site. Have you checked to see if it is a coolant sensor? Have you checked to make sure the fans are coming on? Are you leaking coolant anywhere? Checked the cap?
SOURCE: 98 ply breeze heater blows cold air, replcd water
Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)
SOURCE: 2002 CHEVY ASTRO VAN HEATER BLOWS COLD
sounds like a sensor is out or your fuse is out try those two things hope that helps
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