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Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

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  #1  
Old 05-30-2009, 09:11 AM
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Default 03 Impala cooling fan schematic

I am looking for the schematic for cooling fan 1 for an 03 Impala with a 3.8 engine. I am getting an error code indicating a problem with the circuit of cooling fan 1. The 25A fuse for cooling fan 1 has blown several times. The problem started on the 1st 90+ degree day while in bumper to bumper traffic. Engine temp was running ~200 deg when the check engine light came on. Temp spiked 20 deg and gradually climbed into the red. Car runs normally when temp drops back to the 60s & 70s. This problem started at the end of last summer and went away when the weather cooled. I have swapped the relay with others in known good circuits with no change to either circuit.
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Old 05-30-2009, 11:08 AM
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Here ya go Welcome the the forum!
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File Type: pdf cooling fan 03 impala 3.8.pdf (45.6 KB, 547 views)
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Old 05-30-2009, 12:04 PM
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Thank you. Before I start troubleshooting, is there a common point of failure or defective component?
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Old 05-30-2009, 12:19 PM
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No problem, the fan could be bad. Is your coolant nice and full with no air in the system?

Lets see if any of the ASE guys here can chime in on the common problems.
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Old 05-30-2009, 12:36 PM
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Quote:
Originally Posted by Mike Sigmond View Post
Here ya go Welcome the the forum!

Where in the ***** did you find that..

BTW who volenteers to teach me how to read schematics?
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Old 05-30-2009, 02:12 PM
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The coolant is full, no air bubbles in the system that I can tell. Reservoir is at "full-hot" so I think I am OK with coolant. Looks like the fans have a high & low speed...didn't realize that. My assumption is the "left" fan is the driver side since the "right" fan stops when the Fan 1 fuse blows.
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Old 05-31-2009, 12:56 AM
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Quote:
Originally Posted by HotSauce6226 View Post
Where in the ***** did you find that..

BTW who volenteers to teach me how to read schematics?
Dude , anytime. I can AIM you sometime and give you some basic sheets to explain it all, its what I did for 15 years , reading them for complex computers systems for huge amusement rides, roller coasters, etc.. I know them prety well and have access to a NAARSO www.naarso.com database that includes cars all makes and models. Its for techs to get factory info on equiptment, My membership is expired so I cant inspect and repair at the moment but I still have a login and password
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Old 05-31-2009, 09:42 AM
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Quote:
Originally Posted by HotSauce6226 View Post
BTW who volenteers to teach me how to read schematics?
A schematic is like a "pipe or plumbing view" a circuit

Google "how to read schematics" and you will find lots of helpful items, most will cover electronics but there are also mechanical, plumbing, electrical diagrams too. keep in mind there is a difference between an electronics and electrical schematic, the electrical one is probably more helpful in automotive trobleshooting, the electronic ones go deeper into the actual device.
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Old 05-31-2009, 10:24 AM
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Here is one for understanding most symbols for automotive schematics...
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File Type: pdf Understanding diagrams.pdf (29.9 KB, 87 views)
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Old 06-04-2009, 06:00 PM
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Still have not found the source of the problem. The check engine light came on in cool weather then went out a couple of days later. The 25A fan 1 fuse did not blow. I am not naive enough to think the problem went away.

I found some discussion of a similar problem at http://www.justanswer.com/questions/...-fans-One-runs

The article describes the circuit logic (which I understand) and provides the temps that cause the various relay actions. Since the temps are far in excess of my temp gauge range, I would like to know what the temp points are for the low speed fans to come on and for the high speed fans to come on for the 3.8L engine with dual heat zones.
Thanks
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Old 06-04-2009, 06:00 PM
 
 
 
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03, 03impalafan, 1, 2003, change, chevrolet, chevy, circuit, code, cooling, fan, fans, impala, repair, schematics


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