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Has no heat: Tempature gauge does not move off of 130 degrees even after operating for half an hour; truck doesnt overheat but has no heat:thermostat has been replaced. has been flushed and filled with anti freeze; ehat gives?
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Check your thermostat,may not be fully opening.Here's how to replace if bad,to check,remove put in pot on stove, heat to 195 degrees and see if it fully opens,and remove and it should fully close.
After you start the car.. check the temp gauge.. if slow to move or stays cool.. you have a stuck thermostat.. as in stuck wide open.. needs replacement.
This also means it takes a very long time if ever to have warm air inside the passenger compartment as the engine never warms enough (during cool weather) to provide hot water to the heater core.
However if the temp gauge reads a proper operating temp.. and you cannot get warm air inside.. you have a control issue with the passenger compartment heating system.
A faulty thermostat will also result in poor performance and poor gas mileage.
Have this checked immediately.. if it were to stick closed suddenly (unlikely) your car could overheat.
This part is not very costly.. labor.. depends on which engine is in this car could take up to an hour to an hour and a half.. they may want to do a coolant flush and replace the coolant.. check belts and hoses while under the hood.
try feeling your heater hoses going from the engine to the heater core. they should be hot at operating temperature. If one is hotter than the other noticably it would indicate a restriction in the core most likely. A partially stuck thermostat could also cause loss of heat but you say the temp is normal. Start with checking hose temperature if they are both on the cool side compared to the radiator hose then further diagnostics are necessary. hope this helps. Keep in touch.
It sounds like your thermostat is not working. Your engine should get up to operating temperature in all weather conditions...that's the job of the thermostat.
When your engine is operating normally, the temp on the gauge should be between 190 and 225. The thermostat is set to open at 190 and this controls minimum engine temp. If you sit in traffic the temp will climb to 225 and then the cooling fan will begin to operate to make sure that you don't overheat.You know that water boils at 212 but you have to add 10 degrees for every pound of pressure the rad cap is set to. Also your coolant has antifreeze in it which raises the boiling point even more. A normal overheat condition of your engine would be 300 or more. Does this help?
Heater not working sounds like a blower motor or heating core. Make sure that your antifreeze is green and mix 50/50 with water, now check and sqeeze your hoses running from and to the Radiator and if its VERY hard and has a crunch sound, it's blocked up, use radiator flush and follow directions, If not than look into the Thermostat b/c if it needs repaired than it will stick and let enough fluid into the engine so that it does not overheat yet with the pressure will back up into the resevoir. My new thermostat is a 140 degree and i've never soon my temp meter get to half way after that.
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