P0128 Coolant Thermostat - Ranger-Forums - The Ultimate Ford Ranger Resource

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Old 11-06-2010
Redneck Rescue Squad's Avatar
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Join Date: Oct 2010
Location: Hampden Sydney
Posts: 14
P0128 Coolant Thermostat

Help please!!! Ok so this code keeps coming up (four times in the past year) and my truck has always run very cold. The past few days it has been in the 50's and 60's and in the evenings into the 40's. That being said my truck almost never gets 195 degrees even if it is 90 degreesF my truck wont get over 185degrees. My thermostat is OEM so it opens at 195. Can anyone tell me the reason for the code? And also is it bad for my thermostat to almost never open?
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Old 11-06-2010
djfllmn's Avatar
Join Date: Mar 2009
Location: York, PA
Posts: 5,796
id try replacing the t-stat and flush the system with new 50-50 coolant...start there and see what that gives you
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