How to change the engine thermostat - Cars & Trucks

Your thermostat is located at the back of the engine while looking at the engine bay. Unfortunately you need a GM tool that holds your timing in place while changing the thermostat on one of these engines.

Follow the top radiator hose back to the engine. Where it attaches is where the thermostat is. Remove the bolts that hold the thermostat cover on to the engine and remove the thermostat. Clean any old gasket material from both the engine and the thermostat cover. Drop in the new thermostat, then align the new gasket and install the bolts.

Most likely the thermostat broke. I expect that you have an older Hyundai and never had the anti-freeze changed. When the engine is cold the thermostat is closed which causes the engine to warm up more quickly. A warm engine runs more efficiently (less gas) and more smoothly. When the engine temp reaches a certain temp the thermostat opens and then allows the hot engine coolant to run through the lines to the heater core. The heater blows air over the heater core which produces the warm air that warms up the cabin. Thermostats used to be cheap and easy to change. I would suggest a web search for how to replace the thermostat. Something like 'hyundai accent 2002 replace thermostat".

1. • 1 Pop the hood and locate the thermostat. It's on the passenger side of the engine and has a plug leading into it.
     
   • 2 Unplug the thermostat housing from the engine block using the 3/8-inch ratchet and socket set. The housing will come off in your hand and then you can pull out the old thermostat.
     
   • 3 Scrape off the engine block and the thermostat housing's mounting surfaces with the gasket scraper. This is to ensure the replacement gasket seals correctly.
     
   • 4 Place the replacement thermostat into the engine block and place the gasket over the ends of the bolts in the thermostat housing to keep them aligned.
     
   • 5 Bolt the thermostat housing into the engine block using the 3/8-inch ratchet and socket set.
     

Read more: How to Change the Thermostat on a PT Cruiser ' eHow.com http://www.ehow.com/how_5643178_change-thermostat-pt-cruiser.html#ixzz1g9B0K8Go

First off who ever said $400 to change a thermostat is trying to rip you off. The actual part is like $20 bucks max and its so easy to change. I can guide you through it if you would like.

The P0128 code is Coolant Thermostat Malfunction.

These are the possible causes for this code:
- Insufficient warm up time.
- Low engine coolant level.
- Leaking or stuck open thermostat.
- Malfunctioning engine coolant temperature sensor.

These are the possible quick fixes:
- Top OFF Engine Coolant
- Replaced Thermostat

follow the hose that comes from the top of the radiator to the motor, disconnect the hose and the housing,then the thermostat

You didn't post your engine size so please choose the correct steps for your engine:

2.2L Engine



The thermostat is located in the lower radiator hose on the 2.2L engine




Remove the two retaining bolts for on the housing




Separate the housing halves to access the thermostat




Pull the thermostat out to remove it from the housing




The thermostat has an O-ring which goes around the center




Thoroughly clean the mating surfaces of the thermostat housing


When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 miles or 24 months.

1. Disconnect the negative battery cable.
   
2. Properly drain and recover the coolant until the level is below the thermostat.
   
3. Unfasten the coolant outlet-to-inlet manifold attaching bolt and nut, then remove the outlet.
   
4. Remove the thermostat. Clean the inlet manifold and outlet mating surfaces.
   

To install:

1. Install a new O-ring onto the thermostat
   
2. Place the thermostat in the inlet manifold.
   
3. Attach the coolant outlet to the inlet manifold, using the bolt and nut. Tighten to 89 inch lbs. (10 Nm).
   
4. Refill the engine cooling system.
   
5. Connect the negative battery cable, then start the engine and check for coolant leaks.
   

Change bank 1 sensor 1 this will solve your problem. Tihs is a fuel issue nit a thermostat issue.

ihave to change my thermostat in my 04 jeep liberty is it hard