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2009 ford ranger 4.0 code p0128. replaced thermostat and still get p0128 code

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: what is error code P0128 on 2006 Ford Fusion SE, 4

P0128 is the fault code to check 1.the coolant level 2. thermostat defective 3. ECT (engine coolant temperature) sensor defective

Posted on Jan 30, 2011

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  • 43 Answers

SOURCE: how do you change the thermostat on a 98 ford ranger 2.5L

CAUTION If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.

  • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
  • Remove the upper radiator hose connection from the thermostat housing.
  • Loosen the housing bolts and remove the housing.
  • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
  • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
  • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
  • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
  • Install the gasket.
  • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
  • When the engine has reached operating temperature make sure the thermostat opens.
  • You should be able to see coolant circulating within the radiator.
  • Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
  • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.


When replacing the thermostat, also replace the gasket that seals the thermostat in place and is positioned between the water outlet casting and the engine block.
Generally, these gaskets are made of a composition fiber material and are die-cut to match the thermostat opening and mounting bolt configuration of the water outlet. Thermostat gaskets generally come with or without an adhesive backing. The adhesive backing of gaskets holds the thermostat securely centered in the mounting flange, leaving your both hands free to align and bolt the thermostat securely in place.
  • Remove the thermostat housing.
  • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If any gasket remains on either of the surfaces, there will probably be a coolant leak after reassembly.
  • Some engines use a rubber O-ring to seal a thermostat housing.
  • Install the gasket.
Hopefully this is helpfully

Posted on Nov 17, 2008

chrischronic
  • 235 Answers

SOURCE: Replace thermostat in 2000 ford ranger

the open pipe that you took the hose off of is the thermostat housing, you will need to remove this to reveal the thermostat, make sure you use a new gasket with sealant when reinstalling thermostat housing to prevent leaks and dont over tighten the bolts,run both bolts down as far as you can before final tightning

Posted on Dec 26, 2008

emissionwiz
  • 76070 Answers

SOURCE: I need wire color codes for a 2009 Ford ranger

I took my time to find this for u please show your thanks with a "FIXYA" rating.

2009 Ford Ranger Car Stereo Installation Guide
Car Radio Battery Constant 12v+ Wire: Violet/Red
Car Radio Accessory Switched 12v+ Wire: White/Red
Car Radio Ground Wire: Black/Yellow
Car Radio Illumination Wire: Blue/White
Car Stereo Dimmer Wire: Green/Red
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): White
Left Front Speaker Negative Wire (-): White/Brown
Right Front Speaker Positive Wire (+): White/Violet
Right Front Speaker Negative Wire (-): White/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Orange
Left Rear Speaker Negative Wire (-): Brown/Yellow
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Brown/Blue

Posted on Sep 30, 2009

  • 12 Answers

SOURCE: code P0128 ford, fusion 2006 4 cly

I had the same code. It means your engine coolant temp. is too low. That means your thermostat needs to be changed. Get the Ford Motorcraft one. It comes with the entire housing. Have a mechanic replace it. It is a real bugger to get to.

Posted on Mar 29, 2010

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the thermostat opoens at 195 degrees Farenheit, so any range from 175-200

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Read more at: http://www.obd-codes.com/p0128
Copyright © OBD-Codes.com

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Upstream HO2S Sensors Swapped or this one
P0128....Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) now if this a 2006 model built for the europeon market then your code reader is a waste of time as it will never read the correct codes and if your really lucky it could lock up the immobilisor as well this is to prevent general garages from doing any repairs so just take it back to a ford garage

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Code P0128 ford, fusion 2006 4 cly


I had the same code. It means your engine coolant temp. is too low. That means your thermostat needs to be changed. Get the Ford Motorcraft one. It comes with the entire housing. Have a mechanic replace it. It is a real bugger to get to.

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CODE P0128- THERMOSTAT MALFUNCTION. POSSIBLE CAUSES 1. ECT SENSOR IS OUT OF CALIBRATION. 2. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.3.INSPECT FOR LOW COOLANT LEVEL OR FOR AN INCORRECT COOLANT MIXTURE.

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Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Inoperative engine coolant temperature (ECT) sensor Inoperative Cylinder Head Temperature (CHT) sensor

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