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Fans will not come on - 2003 Chevrolet Impala

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Try replacing the fan relay under the hood in the black plastic box near the firewall. Remove the cover by releasing the clips and there should be a diagram on the back side of it to help you locate the cooling fan relay(s). Pull out the correct relay with your hand and push the new one in, then try starting the engine and turn the air conditioning on high. One of the fans should turn on with the compressor but if it dos not engage, let the engine warm up and monitor the temperature gauge while you listen for the fan(s) to engage.

Posted on May 16, 2010

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Pontiac montana 2003 two radiator fans both not wind


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Fans not running


You may have a 2nd problem. Those fans should run when the car gets warmer than usual. The TDI you have is VERY good about being efficient, and produces little waste heat. Those fans don't come on anywhere near as much as a gas burner BUT they need to come on when you're really working the engine or it's a very hot day. Fan motor failure was common on these cars. With engine running turn on the A/C- this activates both fans to kick on. Do both fans kick on ? If yes- could be temp sensor, also a commonly replaced part- if no check fans. With battery disconnected (for safety) spin the fans by hand. Are they stuck or do they sound awful ? Fan motors may be shot. If fans spin free may be fan relay- check for power at fan connectors with engine running and A/C on

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There are several relays for the fans Low speed relay, high speed relay, and the A/C relay. Check to see if they operate in any of these modes.

There is one fuse for each fan, usually in the Maxi fuse relay center on the firewall.

Make sure you have continuity through both fans with a DVOM as both fans might be bad. Them use it to see if you are getting power to the fans, as well as ground.

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What temp should the fans come on in a 2000 corvette


Usually fans come on when engine temperature reaches around 90 degrees Celcius. In cold weather it is possible that the thermo fans do not kick in. if the fans are not kicking in when they should it would be a sensor relay fault or the fans have given up the ghost.

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Cooling fans do not come on 1994 honda accord


turn on a/c if they still dont come one unplug and use jumper wires to ck fans if they dont work replace both fans if fans work ck fuse and relays if fuse and relay have power ck pcm/ecm

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The fans on my 2001 nissan sentra dont turn on


The cooling fans are controlled by the computer, it must be put through an active mode test at the dealer to see what shows up for the fans, Do not replace any parts unitil this test is run.

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Cooling fans on radiator will not come on. what can i do?


Hi kattrinahawk, If your cooling fans do not work, take a second to understand the system: 1)Fans will cycle on and off depending on engine temperature. 2)Fans will come on when Air Conditioning system is On. 3)Fans will come on if certain malfunctions in engine electrical systems. Fans are controlled via the ECM/PCM or sub computer. Fans usually have separate fuses and or relays/resistors. Ok so lets check a few things: 1)Check your engine coolant level, fan operation is depending on correct/full level 2)Turn your A/c on max settings and wait a few seconds see if fans cycle. 3)Check for obstructions or loose wiring around/on fans. 4)Inspect fuses per owners manual locations identification.

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Radiator fans not working on my 1995 chevrolet caprice classic


The signal path is that coolant sensor tells ECU that the engine is 'hot'. Voltage at the relay for the fans switches on main voltage via a fuse to the fans. Check the fans first; run a wire from the live battery terminal to the fans' positive connection. If the fans do not operate check the negative wires from the fans for continuity and quality of connections. If fans do run then check the fuse and the fan relay. The fan relay might be interchangeable with one of the other relays (main lights?) so temporarily swap it over and see if that has any effect.

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1 Answer

Heater blowing good heat temp gauge not moving and cooling fans not coming on. Unplug engine temp sensor and fans start put plug back on fans stop. gauge never moves


bad gauge or bad thermostat.

Fans come on because when you disconnect, it goes to default mode of fans on high speed.

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Both radiator fans run continuosly when the battery is connected.


if it didn't do it before you had the fans replaced i'd say that they forgot to re-connect a wire to the ignition or something, causing it to have a continuous current, take it back to where you had the fans done and they should fix it free of charge, after all they did it.

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