Question about 1987 Buick Skyhawk 2 Door Sport

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Radiator fan relay gets 12v but won't engage

Radiator fan relay gets 12v to mag coil but not enough amps to operate magent relay to engage curcirt.

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Possible bad fan relay, or fan and check pin connection and connecters also check for a good ground....

Posted on Apr 29, 2010

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Posted on Jan 02, 2017

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I have a 2003 Jeep Grand Cherokee Laredo I DID replace the Relay switch or solenoid,but my fan still IS not coming on WHEN my car reach the temperature.


  • Your fan is designed to come on when the temperature rises ABOVE the normal operating temps.When driving at a steady cruising freeway speed the wind through the radiator fins is usually enough to keep the coolant within operating temps. When the wind through the radiator stops or slows dramatically, like pulling off the freeway and coming to a stop sign, the coolant gets hotter and the fan(s) will come on just to get the coolant back into the 'comfort zone' and shut off until needed again. Sitting at an idle can take a car an hour or so before the fan(s) kick in. If you have A/C then you could have two fans. One will come on when the A/C is turned on to assist with the cooling as the condenser gets extremely hot when operating

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2004 Venture Chevrolet minivan cooling fan circut


Are you talking about the radiator fan? How hot does the engine get in degrees F? Some makes and models, the radiator fan won't turn on till about 220 degrees F. Check for applicable trouble codes, see if any code that refers to the radiator fan circuit or coolant temp sensor? Some of the national brand auto stores will check codes for free.

Of course, as far as overheating in general, you have the thermostat--water pump and other possible issues. Are you losing coolant?

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Compressor Clutch disengages and Radiator Fan starts to run loudly


The radiator fan should turn on when the a/c clutch engages as this is designed to increase the cooling of the engine as the a/c increases the engine loading. But the compressor clutch should stay engaged as long as there is need for cooling, and disengage/re-engage as the temperature control calls for cool air. The radiator fan will shut off IF the engine temperature is cool enough to do so, as it is regulated by heat, as well as the A/c override.

If your air conditioning is not cooling the car and the clutch is simply disengaging prematurely, have the temperature control and relay checked for proper operation. Also have the refrigerant level checked to assure there is adequate refrigerant in the system and no leaks. My first bet would be the relay or the thermostatic temperature control under the dash.

Jun 14, 2014 | 2006 Chrysler Crossfire

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How do I check my main relay? 87 Honda accord lxi


check, ?
ok all relays
the relay is just a coil (mag) and a switch.
many relays have just 4 pins.
most main relays have 2 pins at 12v. one on the coil and one on the common contactor pin (input)
the ECU/PCM grounds the other coil pin, the mag field inside builds and the contactor closes. and the contactor ouput pin
goes to 12v and the ECU then powers up.

HOW?
how to check it, is easy, use a voltmeter, (never lies , like other ways)
any DMM , even that cheap one at walfart works great.
set the dial to 20vdc.
conn, black lead to car body, metal.
conn red lead to the 4 pins, 1 at at time and key on. (no start)
if the 2 pins do not have 12v(input pins) the fuse is blown or some dork cut the wires to install some , accessory.
now see the ECU ground the othe coil pin, 0volts,
the relay is now energized, (coil must not read infinity removed)
now check the output pin on said relay, if 0v , the relay is bad.
if 12v, on this pin, well , the relay is 100% OK.

to work on cars, you must learn electrics first, then how relays work. there are millions of web pages on this subject,

ok , i went to alldata.com (so can you)
and that car has 7 pin, MAIN relay.
black yell and blue black pins are 12v keyon.
yellow wire is fuel pump (early cars have 2 relays in one)
black is ground, if open , all is dead ! must be 0v
fuel pump enable line is green-black (ecu commanded)
0v when active, most cars take cranking to go active.
the blue-red wire from crank fuse. sends 12v to pump relay coil
for crank pump action.
and last but not least is the yell-black wire, this wire runs the ECU
and all injectors. this is 12v key on. if not check all coil pins on main.
i answered in the generic and exact.

old post. but lots of old handa's still ,

all this is on alldata.com or at mitchels.

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check the freon, if there isn't enough it won't engage, could also be the low pressure switch or a fuse.

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You need a book. The fans come on when the pressure switch sends a signal to the BCM to energize the fan relays. If the freon charge is low the ac system won't build up enough high pressure to activate the fans. If the pressure switch is bad the computer won't know the pressure is high enough to need the fans. And so on.

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1 Answer

Radiator fan doesnt run


check your radiator fan relay.

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How many volts for radiator fan to operate


Battery voltage. 12.6 volts to 14.5 volts

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Clutch fan?


no the fan that is used on most vechiles is called a viscus fan , it operates from the heat from your radiator, when you first take off the fan stays engauged because the liquid inside is cold and thick , causing a lock up in the fan, this is normal. once it gets heat from the radiator it thins and allows the fan to spin freely. then once enough heat is sensed by the coil windings on the front of the fan a valve inside is opened and the thinned oil is diverted and causes the fan to lock up again to help remove heat from radiator .

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1 Answer

Blower motor will not work


Do further tests at the relay to ascertain whether the fault lies before or after the relay.
Check power availability at the supply side of the relay contacts - should have 12v from a supply fuse on one side of the normally open contact (note -this supply may only be available when Ign or Acc sw is on).
If power supply is ok at the relay contact, check control input to relay operate coil.

If a ground (or 12v) operates the relay, operate the relay with a local ground (or 12v) and check blower motor runs.

If all above OK, check control signal from fan switch is arriving at the relay control coil.- if not trace wiring back to the switch.

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