Question about 2003 Chevrolet Impala

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Check engine light is steady on 2003 Chevrolet Impala LS

I took my car to auto zone and did an OBD on it and it said the engine cooling fan relay is defective or the control circuit for cooling fan 2 so could I drive the car to shop to get fix should it be covered on my extended warranty

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  • Wedge418 Jul 25, 2008

    I have the same problem but I haven't had it checked out. The engine temp guage shows temp climbing. When I turn the heat on the engine cools off. The coolant level is fine. I thought it might be the thermostat or the water pump. I have been concerned that the cooling fans don't run.


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My fans that cool the engine do not come on at all. The temperature climbs when I sit still. When I drive, the car seems to cool down.What do I need to do.

Posted on Mar 19, 2009

  • christina neihardt Feb 27, 2014

    im having the same problem with my 2006 colbolt. my relay the cover came off in i can rubber band it and it will turn the fan on but when u turn off car it continues to run. n i replaced the relay in that didnt do anythyng still not working..


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Wedge, chances are your radiator might be clogged. Rads are designed to provide cooling even if a certain capacity is not flowing (10% or so). Beyond that, you will start to experience higher engine temperatures. You will usually start to see it when your vehicle is under load (AC is on, towing, steep inclines). By turning on the heat, you introduce your heater core into the cooling equation, therefore increasing the capacity of your cooling system enough to make up for the loss in your radiator. If your cooling system is ever low, rust develops in your block which is cleaned away by DEX Cool. However, this rust turns into a red mud which often ends up in the radiator (happens often in chevy pickups with the 5.7L). You have a few possible options if this is your problem.
1. Flush your cooling system. Not just the rad, the entire system. Make sure you get the dirty coolant out of the block.
2. This is rarely done anymore, but you can have you radiator rodded out. This involves a radiator shop taking you radiator out, removing one of the tanks, and pushing a long rod through each tube to remove any contaminates. It is not done much anymore as a new rad is often about the same cost.
3. Replace the rad.
Any route you take, make sure the ENTIRE system is flushed properly or you run the risk of recontamination your entire system. Hope this helped.

Posted on Aug 10, 2008

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So get that code read and start some diagnostics. I would suggest you start by checking fuses, relay, wiring. Then use a digital volt meter to see if the fan is getting 12 volts. Then try hooking the fans up directly to the battery to see if they work.

If you need more help, just let me know. Good luck!

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