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have a compression test done to check for head gasket or cracks.. Check coolant level in the radiator not the reservoir. Have a cooling system pressure test done to check for leaks. Have a flow test done on the radiator to check for blocked cores. Have the fault codes read to check for sensor/ servo failure.
Your collant level is insufficient ( too low a level ) to deliver hot coolent to the heater core....
Check coolent level in overflow bottle... it should read full....
OR
Your thermostat is frozen open not allowing the coolent to sufficiently heat up ...
You have to bleed the coolant system.There are some bleeder screws,with hex heads on them.Hold the bottom nut and gently loosen the top until water and air flow,with the system not running.When the air is not present,tighten back down gently.If the air won`t bleed out,then fill the coolant reservoir over the full mark about 3/4 way full.Make sure radiator is full,and start engine with ac off.Let it run befor it bubbles or gets too hot,turn engine off,and let it set for about 35 to 45 minutes.Check coolant reservoir to see if the coolant level has dropped.It should have dropped,if so repeat until the reservoir stops loosing fluid.The fans should come on,and go off by them selves.When this happens,then the cooling system is perfect.This I hope helps,please let me know the [email protected]
check for a blown head gasket it will sometimes pump air into the heads and make the coolant levels seem fine but in truth they are not and check the water pump for rusted fins make shure the water level sucks down during sharp throtteling of the motor if so the cooling system is fine as far as that goes but where to start
1.) tempature switch located on the motor it tells the ecu when to kick on the cooling fan
2.) fans spin freely without taking force
3.) thermostat it could be stuck closed due to someone at sometime only running water without antifreez and causing the pressure pin to rust and freeze the gate shut
4.) monitor the water levels if they go down suddenly as 1 gallon of water a week or 2 weeks its a bad head gasket you can see this on spark plugs as well
and for most your water pump make shure you get good heat from the heater at low running tempatures and start the car and monitor what the water in the radiator does (while its cold) the water in a car is over 195% and can easily do harm if the car is just warmed up not even close to over heating so you can imagine what it could do at an over heated state
but get the problem fixed or else you can result in blown head gaskets water in the oil piston breakdown do to rust in the piston walls and even worse complete engine failure
Normally you only need to check the level in the tank under the "engine coolant only" cap, but if you had a leak and lost coolant, check that the level of coolant under the "never open when hot" cap (it should be the radiator cap) is full - up to the brim. if not, fill it to overflowing, then cap it, fill the tank to its level, start the truck, let it reach operating temperature, let it cool down again, check the level in the radiator. if it's still fine, you need not worry about it again, just check the level in the tank daily.
No the light is linked to a sensor. There is a coolent sensor that tells you that the level is low. It sounds like the sensor has gone bad. And the sensor is located in the coolent tank. If it is bad from my understanding you have to replace the whole tank. But take a paper clip with the engine off and disconnect the wire harness from the sensor and jump the wires and see if the light goes off.
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