Radiator fan won't turn on - Automotive Wiring and Electrical


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Radiator fan won't turn on

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Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical

JezaMetroGal
New User

Jul 17, 2015, 9:29 AM

Post #1 of 4 (1316 views)

Radiator fan won't turn on	Sign In

I'm new here and this is my first forum post ever so please excuse my screw ups. I have a 96 Geo Metro 1.3 automatic with over 100,000 miles. My radiator fan won't turn on and the cars temp gauge hits the red. If I slow down and turn on heater full blast it lowers the gauge. However driving at 45 MPH just don't cut it. If I wire the fan direct to the battery it turns on. So I know the fan motor works. There is also a second fan (engine cooling fan) on the opposite side blowing from opposite direction, it doesn't come on either. Can anyone please help me with this problem? Any advice would be greatly appreciated.
Thanx

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 17, 2015, 9:41 AM

Post #2 of 4 (1305 views)

Re: Radiator fan won't turn on	Sign In

First test the two fuses in the diagram. They are in different fuse boxes. If they are good, check the relay.

One of the fans is a cooling fan and the other is an AC condenser fan which would be controlled by the AC. You can tell by the wire colors which one is which.

The cooling fan will have the blue/red and the black wires.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

(This post was edited by Hammer Time on Jul 17, 2015, 9:42 AM)

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 17, 2015, 6:45 PM

Post #3 of 4 (1291 views)

Re: Radiator fan won't turn on	Sign In

I'm confused. You stated that when you slow down with the heater turned on the temp comes down? Is it overheating while your cruising at 45 mph or higher? If so, the fans don't even run at that vehicle speed. There is enough ram air going that fast.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 18, 2015, 4:05 AM

Post #4 of 4 (1282 views)

Re: Radiator fan won't turn on	Sign In

? Are you sure of your observations said in top post? Fans can run "opposite" directions!?
Any even slight damage fixed or not to front of this car? Rare but the air dam under front bumper at speed actually causes more air to flow thru grille but if missing could make airflow difficult or neutral.

BTW - if heater is still blowing heat when a temp gauge is pegged to hot it might not be really overheating as it would be boiling at some point and vapor doesn't cool the engine nor blow hot air for the heater.

Other on long list: Bugs/debris caught up in radiator or unseen between parts blocking air flow, water pump not up to par, radiator itself not clear inside - plugged, too much (meaning usually pure antifreeze in use not a mix) AND a very hot day. Fans totally not turning intended direction?

T

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