Question about Cars & Trucks
When are the radiator fan's suppose to come on.When hot or when a/c is on.
Fan is suppose to come on anytime the AC is turned on, and anytime the engine temp pass a set temprature. operating range. thermostat opening range usually controlled. 196 degrees etc.
Posted on Nov 16, 2013
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Posted on Jan 02, 2017
Try this web site. It takes you to Auto Zone "How To" site. This one covers the 4 cylinder as you did not indicate the engine size.
Good luck and hope this helps.
Posted on Apr 20, 2009
check fuses #25 and #6 (both 30 amp)
the fan thermostat is on the left side of the rad.
turn the ignition on, and after pulling back the boot, short across the two terminal with a screwdriver.
if the fan runs, fan and wiring are both good.
if it only runs when thermoswitch is shorted like this, switch needs to be replaced (get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market!)
if the fan doesn't run when switch is shorted, check for valtage between green wire and ground at the switch.
Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box.
Posted on May 30, 2009
The fans come on only when hot or the AC is on. There are many fuses that have to be good for it to work. The fan relay should have 2 pins hot with the key on, The other 2 should be ground. with the key off one should be hot and the other can then be ground the other pins that are ground one of them is the fan. the other becomes ground when the computer turns the fans on. If you don't have a pin thats hot at the relay all the time then theres a blown fuse or even the power wire from the battery at the battery
Posted on Nov 02, 2009
Engine over heating can be caused by a number of things. When you say the water pump and radiator appear to be ok I am also guessing that you checked the coolant level to make sure it is normal.
If the level is low then you obviously have a leak. Insufficient coolant circulating will not cool the motor properly because it won't be able to draw enough heat out. If the level is normal then you need to check the thermostat to make sure it is opening properly. To do this, run the motor to temperature and check the top and bottom hoses. They should both be hot and firrm once the thermostat opens meaning the circulation loop is operating properly. If the top is hot and firm and the bottom is cold/soft or collapsed then the thermostat isn't opening.
If the thermostat is operating properly then you ned to look for some other obstruction or cause for coolant loss. Check the head/intake gaskets, hose connections, hoses, over flow tank, radiator fins, radiator side tanks etc..
Posted on Jun 10, 2010
Testimonial: "Thank you for your quick response. I will get the head/intake gasket checked."
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