How to test an electric cooling fan (2003 Mercury Grand Marquis)

In this video I will show you how to test an electric cooling fan on a 2003 Mercury Grand Marquis. We will cover the inputs involved as well as the output controls and include detailed testing methods. This same how-to video can be used for an electric cooling fan that does not turn on. (Overheating conditions)

Engine Performance Diagnostics chapter 6

Symptoms
- cooling fan runs all the time
- no codes stored

Fix
- replace the cooling fan assembly

Tests shown
- how to do a rationality test for temperature sensors
- how to identify 5V coolant temperature sensors and coolant temperature gauge senders
- understanding Ford cooling fan module wiring
- identifying circuit design on the cooling fan control circuit
- how to use a test light to check a computer driver
- how to use a scope to check a computer driver

Tools used
- Autel MaxiSYS MS908 Diagnostic System with Wireless VCI
http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=http://www.aeswave.com/Autel-MaxiSYS-MS908-Diagnostic-System-with-Wireless-VCI-p9202.html
- PicoScope 4425 4 Channel Standard Diagnostic Kit
http://www.aeswave.com/PicoScope-4425-4-Channel-Standard-Diagnostic-Kit-p9276.html
- OTC 3633 Mini Circuit Tester
https://www.jbtoolsales.com/otc-3633-mini-circuit-tester#oid=1014_1
Playlist
- HVAC and Cooling systems troubleshooting and repair
https://www.youtube.com/playlist?list=PLAFYVCyenqco2yr65mNu24aiYT84-YBQy
Related videos
- 2002 VW GTI Cooling Fan Test (Part 1)
https://youtu.be/S77LFqhIhFE
- How to test an Engine Coolant or Intake Air Temperature Sensor (any car)
https://youtu.be/nksLy9MS0IQ
- How to test a coolant temperature sensor (ECT sensor test)
https://youtu.be/wxaohKkQF3o
- Electro Viscous Fan - P1482 Cooling Fan Speed Sensor Circuit
https://youtu.be/EEJdurlvlyA

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

Видео How to test an electric cooling fan (2003 Mercury Grand Marquis) канала ScannerDanner