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Possible that the fan belt is not tensioned right or that the water pump is binding causing low flow through the heater.
If belt is not loose, release it more and try turning the water pump by hand to see if it is binding.
Is it happening when your heat or ac is on? The blower motor for climate control may be going bad also many times debri can get in and rub on fan i have pulled them apart to find pens,lighters,matches,foam and tape from factory left in system also.can work.loose and hit fan. See if it stops.when u turn off fan for heater/air conditioner
Most likely you have a seized AC compressor. When you ask for AC or heat the AC clutch engages with the pulley wheel that normally spins freely when the AC is off. As the pulley wheel is no longer able to turn because of the seized compressor the belt will either slip or snap.
Here's something that's a very common cause of overheating, and it's easy to check.
How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater temperature on high and turn the fan speed on high. 1. Listen very closely for a click sound from the engine, ( most thermostats make a click when they open ) 2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate. 3. Usually within a few minutes the radiator fan will kick.
What the thermostat does;
It seperates your coolant into two parts. The first part is in your engine, the second part is in your radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows from the engine into the radiator and reservior to be air cooled by the radiator fan.
sounds like the reiculation door is not moving, listen for a change in sound when you
move the knob from fresh air to recirculate. if no change, you will need to check the recirc, actuator or door inside the blower
the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation email@example.com