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check for low coolant level make sure coolant system been bleed from air.make radiator full coolant and coolant reservoir on the full cold mark.if all is good the cooling fan relay could be bad or the engine coolant temperature sensor could be faulty.
You would need to figure out if it is a cooling problem or something producing extra heat in the engine. Is the radiator fan pulling enough air thru the condenser and radiator ? Is the fan coming on and also when the ac is on and when the engine reaches 220 degrees ? Is it possible the exhaust has a restriction somewhere ?
You may have an engine cooling fan that isn't working. When you run the heater you are removing some heat from the cooling system which aids in keeping the engine cool. If the cooling fan in front of the radiator isn't working then the engine can overheat at slower speeds when there isn't any air being forced through the radiator by the forward motion of the vehicle. If this problem is happening only at slow speeds then I would suspect a cooling fan BUT if it happens at steady speeds over 35 mph you may have a different problem.Hope this helps and good luck!
The fans are actuated by coolant temp in the radiator. It is possible to have overheated coolant in the radiator, causing the steam, and your engine not overheating...the temp sensor for your engine is reflecting the engine temp, not the temp of the coolant in the radiator. You problem could be a bad temp sensor at the radiator...not allowing the fans to come on. Good Luck! I hope you find this to be very helpful!
check the serpentine belt for slipping, the clutch fan, the thermostat(might be stuck closed) or maybe it is a circulation issue, you can check the radiator and radiator cap for defects and sediment buildup. you might be able to confirm circulation problem if you turn heat on and it doesn't overheat.
The check engine light on means there is a code stored in the ECM. You will have to have the OBD II system scanned and cleared. The other problem is probably just a blown fuse. If you need more help get back to me.