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P0128, 2004 3.0


flyin-lowe

Forum Member

Law Enforcement
Joined
Aug 19, 2024
Messages
104
Points
101
City
Indiana
My son's truck, 120K miles. Light came on tonight and reads P0128. From what I am reading most likely cause is thermostat. I plan to replace that in the morning. Watching YT videos seems really straight forward. Couple questions though, I looked on Oreilly's website tonight to make sure they had them in stock, they show several different temperature's. Which one do I need? In Indiana if that makes a difference. What would the stock thermostat be as far as the temp goes? Also, I assume on this year Ranger the standard coolant is fine if I need to top it off? Lastly, will I loose much (if any) coolant if it's been parked for a while? Didn't know if I need to drain any or since that hose is high, should it not be holding anything if it has not been running?
 

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