Fx35 overheating. coolant reservoir fills all the way to the top, releasing out the overflow spout. very hot coolant. near boiling. everything buy the head gasket has ben looked over replaced.
If it's spraying out of the spout and is boiling, it's very possible that one of the head gaskets blew depending on how long it takes to overheat.
A few things to look for:
Inspect the radiator. Make sure all of the cooling fins are there, and not obstructed by dirt/debris.
Make sure the cooling fan is turning on (it should turn on when the temperature is approximately at the halfway point of the temp gauge).
Look at the color of the "smoke" coming from the tailpipe. White = steam. Some steam is normal, however, if it's constant, and a lot of it, it's a blown head gasket indicator.
Blue = burning oil. Black = unburned fuel,
SOURCE: Overheating
Hi,
If the car is overheating it could be due to a thermostat which is stuck in the closed position, a failed water pump or just a slack belt driving it. I think there will be a "little" tube carrying coolant from the engine to the coolant expansion tank, and if you run the engine with the filler cap removed you should see water coming through that pipe IF the rump is running. A failed water pump will not necessarily leak, it just won't pump the water round the engine.
Always take care when dealing with a pressurised cooling system on an overheating engine - the water may well be above boiling point.
If you run the engine without coolant the cylinder head may well warp and repair bill will be huge.
Hope this helps you a bit. D
SOURCE: Coolant overflowing out of expansion tank no boil no steam
As you've stated driving around town it's fine, and everything is working well. For the symptoms, there are 2 possible causes:
1. Your cooling fans are not working.
2. Your radiator needs to be replaced.
I'm sure you can determine which it is, and I wish you luck on your repair.
SOURCE: 2004 Jeep Grand Cherokee (4.0L)...The
When running the engine TOUCH the bottom part of the radiator fins, if the temperature is not the same or cold, u got a blocked radiator FiNS, and u need to replace it! Check also ur Radiator fan, note down what temperature it started to work. If the Fan works at high temp, means ur TEMPERATURE SENSOR switch for rad fan is not working or it has a higher temp operating value! Hope that might solve ur temperament! j/k!
SOURCE: My 2002 Sebring 2.7 L
Not knowing what the dealer did to diagnose your problem, the first thing that comes to mind is a clogged/defective thermostat. When coolant backs up into the reservoir, it's an indication of a blockage and that blockage is typically the thermostat. The problem shouldn't be related to the AC system at all.
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