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Back flush the system and change the antifreeze
And I really wouldn't want to crash it to anything in that vehicle at 80 miles an hour its not made to go that fast.
start car with cap off let it run and see if air bubbles come out or if the prestone shoots up , if there is no heat coming out in the car possible heater core plugged have to clean it out or thermostat stuck as well cap leaks thats why no heat no pressure or leaking system check for prestone loss
Mid way is ok, but u need check thermostat, cheap to replace, also check rad is not blocked with insects, oil ok? Water cap tight? Turn on heat full in car see the temp drop, water pump can be on way out
could be the knock sensor or faulty cam or crank sensor. one of these could be failing but it's recommended to read the engine codes with a scanner as it will tell you the exact fault.
Before getting too upset about this, try changing the temperature sender. Can't tell you where it is but it is usually on or near the thermostat housing but some engines have it on the intake manifold or rear of cyl head.
if you got heat when its running and almost nothing iddling the heater core inside the car has rectriction idle circulation not enough prestone pass thrue the radiator because of scale when our driving way more circulation more prestone go thrue ¸=more heat you need to flush the radiator inside the car normally i put a radiator flush leave it running longer then what they say go for a drive remove the heater core hose be carefull not to break the pipe use garden hose pass hose water pressure o n both side do it a few time each side flush all the prestone add new prestone you shoul have way more heat good luck p.s some shop might tell you change the heater core that perfect but very big money do it right its cheap and gonna work pierre
Mine (quest) would do this at 80 miles per hour with loaded car. Since I keep it at 72, it has not reoccurred. I suggest that the sensor is working fine. There is just a slight engineering problem with my engine that does not produce heat/vibration beyond the calibration of my sensor, as long as I keep the speed down. Fewer traffic tickets also.
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