I want to replace cooling temperature sensor but I can't locate where it is? I have a Haynes Repair Manual book but it is not clear. My car is Volkswagon Jetta TDI 2000. Does anyone know please give me advice? Thankx

The Internet, though, has a large number of web sites where
you can buy service manuals and schematics from bookstores,
publishers, and other collectors. Here is just a sampling of
what sites are out there:

Chilton Repair Manuals
http://www.chilton.cengage.com/


Haynes Publishing
Haynes auto manuals



Vintage Books
Vintage books com Rare used and out of print books

AutoLit
http://www.autolit.com/home.htm

Haynes repair manual xplains or library sec629. Make sure cooling lines to the trans are flowing. Is fluid level normal. Sensor may not b issue. A data stream run w factory gear pinpoints area. Dont see a dealer

I've checked both of my repair manuals for this vehicle. One is Chiltons, the other is Haynes. They both discuss a Mass Airflow Sensor, but no mention of a MAP. I then checked the book covering my GMC S-15 and found the MAP, but no MAF sensor.
Since the location is different, depending on engine size, my best advice is for you to obtain the same repair manual. It has pictures and leads you step-by-step through the replacement procedure. These books also list the diagnostic codes and what they mean.

Here's your book info is below...
Most auto parts stores carry Haynes Manuals. You can order them from Haynes if needed. Or...often they are carried in your local library.

I have done Ford and Toyota clutches using these books. Clutch replacement is not hard, just time consuming...And easier if you have a lift.

Note: If like many vehicles, don't forget to replace the engine rear main seal while you have access with the fly wheel off.

You can call Haynes and ask specifically if the book covers the repair you are attempting. I have called them to get more specific wiring diagrams not always provided with the books. Very helpful in providing tech data... I have a Haynes manual for all my vehicles...makes maintenance and repair much easier than researching every I need to do something to my vehicles.

Best of luck finding the information you need...

Here's your book info.

Saturn S-series Haynes Repair Manual Online covering all 1991 thru 2002 models of Saturn SL, SL1, SL2, SC, SC1, SC2, SW1 and SW2
Part Number #E87010
Haynes Repair Manual Online for the Saturn S-series covering all 1991 thru 2002 models of Saturn SL, SL1, SL2, SC, SC1, SC2, SW1 and SW2 has clear instructions and hundreds of photographs to help you perform anything from simple maintenance to basic repairs. Whether you're a beginner or a pro, you can save big with Haynes!
Complete coverage for your 1991 thru 2002 Saturn S-series (SL, SL1, SL2, SC, SC1, SC2, SW1 or SW2):

--Routine Maintenance
--Tune-up procedures
--Engine repair
--Cooling and heating
--Air Conditioning
--Fuel and exhaust
--Emissions control
--Ignition
--Brakes
--Suspension and steering
--Electrical systems
--Wiring diagrams

I hope you realize that the po125 DTC code does not necessarily mean that you have a problem with the cylinder head temperature [CHT] sensor or the Engine Coolant Temperature [ECT] sensor.

It only means that the coolant temperature is too low for closed loop operation.

Other issues that may trip a DTC po125,

• Insufficient warm up time
• Low engine coolant level
• Leaking or stuck open thermostat

I would clear the code and see if it comes back- since you won't experience any difference in engine operation anyway.

You'll need to perform a continuity test on the sensor, when the engine is cool and then again after warming up the engine.

Then you'll want to take voltage readings on the wire harness that goes from the ECT back to the GEM.
You may find that the wire harness from the sensor to the GEM may be shorting out.

However, I would think that, if anything, the thermostat would be the culprit and malfunction before a faulty sensor.

You'll find the sensor under the upper radiator hose where the thermostat housing is mounted on the engine block. It may be obscured by the alternator.

And if you don't mind my 2 cents worth of friendly advice, either purchase a Chilton or Haynes repair manual from your local auto parts store or online.

Good luck on your project.

P0011 - Camshaft positioning sensor
P2181 - Engine cooling temperature sensor.
If you have a repair manual (chilton/haynes/etc) these should be fairly simple fixes.
Camshaft positioning sensor for my car was $35 and took about 15 minutes to change.

2carpros.com suggested the P2181 is also fairly easy to replace
http://www.2carpros.com/questions/volkswagen-jetta-2004-volkswagen-jetta-code-p2181-engine-cooling-performance

read the book again it will be where the book says you are not reading something rigth

I'm afraid that my online resource doesn't have data on this vehicle. Which means that the best source of information will be a Repair Manual from the manufacturer, or a Haynes or Chilton manual if available.

One can try to locate the sensor by looking for a one or two wire sensor that screws into the 'hot' part of the engine block or cylinder head.

The above part sells for about $35 at Autozone.

haynes is the best manule on the market
go to local book store and spend 30 bucks you will be glad you did they v[come with pics and every thing
indigo books is allways a good start

tempature sensor