Fans not working - Engine Troubleshooting


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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

jkwilliams
User

Nov 28, 2008, 6:18 PM

Post #1 of 5 (1853 views)

Fans not working	Sign In

Would anyone know why my radiator fan do not turn on?
The fuse is OK and its not over heating, yet.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Nov 28, 2008, 6:23 PM

Post #2 of 5 (1848 views)

Re: Fans not working	Sign In

The electric cooling fan is controlled by the computer via a coolant fan switch, which tells the computer the engine temp. Many of these fans will not come on until the engine reaches 220-235F. (Another reason for 50/50 mix coolant..without coolant under pressure, you'd be boiling at 212F.
Loren
SW Washington

(This post was edited by landdchamploren on Nov 28, 2008, 8:47 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 28, 2008, 6:29 PM

Post #3 of 5 (1846 views)

Re: Fans not working	Sign In

Just a thought - is it warmed up enough to even need the fan(s)? If cold enough out it might not??

T

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Nov 28, 2008, 6:36 PM

Post #4 of 5 (1842 views)

Re: Fans not working	Sign In

I was kinda thinking the same thing, Tom.. Got up to a balmy 43F today. Brrrrrrrr. Windy, rainy. Leaves everywhere. arrggghhh.
Loren
SW Washington

autojoe
User

Nov 29, 2008, 10:52 AM

Post #5 of 5 (1828 views)

Re: Fans not working	Sign In

year/make/model/engine size?Most tranverse engines electric cooling fans come on at a stop or in traffic because when vehicle is moving air goes through rad removing heat from cooling system.most people find out fans not running when temp gauge goes up or idiot light comes on.A scan tool would tell you what temperature the coolant temperature sensor is telling the computer.On newer cars the coolant temperature sensor tells the pcm the coolant temperature and then the pcm controls the cooling fan or fans through low or high speed cooling fan relays.if you let car sit at stand still with engine running and temp gauge gets to about 1/2 way about normal operating temperature and see if fans kick on.If you have ac turn the ac switch on and see if the fans kick on.

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