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If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 9 of 9 Thread: radiator fans Thread Tools Show Printable Version Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 03-19-2006, 02:15 PM #1 MR.twooooo View Profile View Forum Posts Private Message View Blog Entries Some Skills Join Date Mar 2006 Location Alabama Posts 55 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
MR.twooooo     $ 0.00 radiator fans when the ignition is on the radiator fans come on and stay on even when the engine is cold . I'v checked a few of the relays and I can't figure out what the problem is.
any ideas Reply With Quote 03-19-2006, 02:31 PM #2 Gairloch View Profile View Forum Posts Private Message View Blog Entries Dreaming of apexes Join Date Aug 2005 Location Minneapolis, MN Posts 5,302 Thanks  139 Thanks  301 Thanked in268 Posts Blog Entries4 Total Contributions For
Gairloch     $ 0.00 One possible reason is that the coolant temperature sensor in the radiator has kicked the bucket.

Anyone know if this should throw a code? "Inside the car, the world beyond the driver's immediate horizon ceases to exist. Alone with the solitude of his desire, survival sense numbed by the speed, he's outrun the mediocrity of the outside world, slipped the shackles it tries to clamp on us all. He is running free, chased only by a fear of failure, for failure is to risk ejection into the real world." ~Mark Hughes


1mz build and install blog Reply With Quote 03-19-2006, 02:34 PM #3 MR.twooooo View Profile View Forum Posts Private Message View Blog Entries Some Skills Join Date Mar 2006 Location Alabama Posts 55 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
MR.twooooo     $ 0.00 is that the sensor on the driverside on the bottom? if so I'v already checked it with a voltmeter Reply With Quote 03-19-2006, 03:02 PM #4 N8s93turbo View Profile View Forum Posts Private Message View Blog Entries Visit Homepage TEAM A.S.S. RACING Join Date Feb 2005 Location Mississippi/Pennsylvania Posts 2,424 Thanks  5 Thanks  28 Thanked in16 Posts Total Contributions For
N8s93turbo     $ 0.00 mine does the same, fan is always on, no codes. 2004 F150 FX4
2007 Mustang GT
Black 91T-sold
Super Red 93T-sold
Reply With Quote 03-20-2006, 07:51 PM #5 GaToy View Profile View Forum Posts Private Message View Blog Entries '86 Sunroof Join Date Feb 2006 Location Fort Valley, Ga Posts 55 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
GaToy     $ 0.00 Yeah it's a bad switch. The if the fan is not coming on you can unplug the switch and if the fan is o.k. the fan should come on. plug it back in and if the engine is cool, it should go back off.

~C.C.~ Reply With Quote 03-20-2006, 09:40 PM #6 TheAmazingDave View Profile View Forum Posts Private Message View Blog Entries Visit Homepage Cage Fighter Join Date Mar 2005 Location San Jose, CA Posts 1,112 Thanks  13 Thanks  7 Thanked in7 Posts Total Contributions For
TheAmazingDave     $ 0.00 Another cause, and pretty common it seems, of the radiator fans running full blast as soon as you turn on the ignition is a bad or missing "A/C Amplifier" module. If you have stripped out the A/C and ductwork you surely took the A/C Amplifier out, too.

The A/C Amplifier controls the vehicle's cooling system fans on A/C equipped cars. If it goes bad or is unplugged the system goes in to a failsafe mode and the fans run full blast to protect from overheating.

You need to test the coolant temperature sensor in the front radiator with an ohm meter, not a volt meter. Below 181 degrees Farenheit the radiator temperature sensor should have continuity, or 0 ohms resistance, between the two terminals. Above that temperature the switch should open and the meter will read no continuity, or infinite resistance. If that checks out the next step is the fan circuit relay or A/C Amplifier. Reply With Quote 03-21-2006, 09:20 PM #7 seven_mgte View Profile View Forum Posts Private Message View Blog Entries Cage Fighter Join Date Aug 2005 Location Coquitlam, BC.ca Posts 327 Thanks  0 Thanks  7 Thanked in7 Posts Total Contributions For
seven_mgte     $ 0.00 I have an amplifer which is not being used (due to extensive rewiring) if anyone needs one. Reply With Quote 03-22-2006, 06:20 PM #8 CpuZapper View Profile View Forum Posts Private Message View Blog Entries Visit Homepage RallyRacer Join Date Mar 2005 Location Portland, OR Posts 482 Thanks  7 Thanks  25 Thanked in22 Posts Total Contributions For
CpuZapper     $ 0.00 My '86 has a weird issue I've been too lazy to track down, but it may be relevant. If you turn the car from IGN to ACC really slowly, the rad fans come on full blast. I'm not sure if it's from a bad ign. switch, something being on when the rest of the system is off, or just a normal anomaly, but it's just some extra info to consider. Reply With Quote 10-10-2007, 08:46 AM #9 yellowwood View Profile View Forum Posts Private Message View Blog Entries No Skills Join Date Oct 2007 Location Indiana, USA Posts 6 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
yellowwood     $ 0.00 '85 Same problem. My fans run all the time too.

The radiator fan switch checked out. Swapped the fan control module in the rear trunk...no dice.

Interestingly enough, I was working on my MAF and noticed a dangling wire connector that is nearly identical to the radiator fan switch connector.
I also noticed a lot of after market hose clamps on a nearby coolant hose.

Can anyone tell me what I am missing from this area?
Could this be why my fans run and run and run?

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