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Re: Engine is showing normal operating temp. Why is there...
Make sure no fuses are blown. It could be the actuating motor that controls the door the mixes the warm and cool air. This is usually located next to the heater core.
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if air comes out of the vents but it is not warm/hot, and your temp gauge shows normal engine temp, then the valve that opens the heater core to the hot water flow from the engine is not opening or the heat core is clogged. I would start there.
Check the heater hoses at the engine firewall are they hot? If so then the air temperature control blend door is either jammed or the motor that operates it is defective or both.
Go under the hood and feel the heater hoses after the engine gets up to temp, if they seem really hot then you may have a problem with the HVAC air temperature control blend door.
What is year--make--model? Your saying the blower motor works but only cold air comes out? Does the engine reach normal operating temp? Are the heater hoses hot? If that checks out, have to check temp door under the dash.
i may be wrong but that sensor is for the ac not for engine operation and at 113 if its not that hot then the sensor is bad but if its summer its ok,, your engine works with intake air temp
Does the engine actually warm up enough to produce hot air thru the heater? In other words, does the radiator get hot to the touch? Does your temperature gauge on the dash indicate a normal operating temperature , or does it show cold? Make sure the linkage from the temperature selector in the dash is connected to the water control valve for the heater.
My guess would be the engine is indeed warming up, but a faulty (or disconnected) water control valve to the heater is preventing heated water from ever reaching the heater core.
I am guessing that the gauge is showing normal operating temp, if so, I am also guessing that the blower motor is pushing air through the ducts.... if so than
were heater hoses reconnected ?
was hot water valve vacuum line reconnected ?
was all air purged from entire cooling system after engine repplaced ?
were heater hoses connected properly to get correct direction of flow ?
are hoses to heater core under hood getting hot ?
First, check to make sure you are not low on coolant. Check hoses going to heater and see if they are getting hot.(one should be hot, the other should be slightly less hot but not cold or just warm) Check heater control valve to make sure that it is operating, Check that plenum door is opening properly inside the cabin, in the heater box. If you have done any work at all on cooling system, run the engine 'till it reaches operating temp with radiator cap off...sometimes htr core can become air-bound. Also...goes without saying, but make sure that engine reaches normal operating temp while driving. If not check thermostat!
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