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Old 03-19-2018, 09:05 AM
ChuckFX4 ChuckFX4 is offline
2003 FX4 229K miles
 
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Default Overflowing radiator reservoir

I recently replaced the radiator and radiator cap, water pump and the thermostat. Now I noticed that the reservoir is overflowing after a short trip....radiator was cool to the touch.

Thoughts?
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Old 03-20-2018, 12:17 AM
12 Deg North Industries 12 Deg North Industries is offline
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Default Re: Overflowing radiator reservoir

Quote:
Originally Posted by ChuckFX4 View Post
I recently replaced the radiator and radiator cap, water pump and the thermostat. Now I noticed that the reservoir is overflowing after a short trip....radiator was cool to the touch.

Thoughts?
Had you not said the cap was also replaced I would have suggested pressure testing it and it may be faulty. But the other aspect is since the coolant tank is mostly cool, it sounds like you may just have air in the system and it needs to be bled out properly.

The air bubble is probably in the cab heater lines. Remove the (cold engine) radiator cap. Start engine and run it till warm. Pay attention to coolant level and keep it topped off as you run it.

Very few vehicles have the coolant stop like Rangers do anymore. There is a device in the heater hose under the hood that opens and closes the flow of coolant into the heater. If you do NOT turn the heat to HOT while filling the radiator there WILL BE an air bubble in the system.
Nearly all vehicles today have constant flow of coolant into the heater. The temperature is controlled by gates (doors) that open to allow air to flow thru the heater core..

After the system is burped, fill the radiator, and the coolant bottle to the proper level. Keep a close watch on the overflow bottle coolant level for a few days afterwards.
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