SOURCE: 2004 hyundai sante fe is making coolant boil back
I take it this only happens when the vehicle is stopped & idling? If not, check radiator & hoses for blockage (since you've already replaced the thermostat & top hose) - repair/replace as needed. Next, check the coolant temperature sensor's operation (there are two sensors - one for the temp gauge on the instrument panel, the other is used by the ECM (PCM). If that one is malfunctioning (i.e., telling the computer that the engine coolant temperature is less than it actually is, The ECM (PCM) it won't turn on the cooling fans.
Since you didn't specify which engine you have (i.e., 2.4, 2.6 or 3.5), Photo locations of all three are included here.
Hope this helps.
SOURCE: I have a 2002 Dodge Caravan sport with 3.3L
The relay is located down at the left lower corner of the radiator support. Little flat box, like a box of matches. common to be bad.
Testimonial: "Thank you for the help. The problem as I see it is I can't find said switch anywhere on the web. I can find a radiator relay fan, but no switch"
SOURCE: 89 buick lesabre electric cooling fans
You are off to a good start by testing the fans. Get a repair manual from your nearest autoparts store. I find them invaluable. Most temperature sensors can be tested with an Ohm meter. Or short the two wires together to trigger fans. If it has only one wire then ground it to the frame/body (negative side of battery). If none of that works (with ignition on / car off) then relay is bad. Also turning on the A/C should make the fans come on. Car does not have to be running, key in on position. This would eliminate bad relays or not.
SOURCE: Radiator fan not operating, radiator fan relay
Jeep WJ Grand Cherokee
The Radiator Cooling Fan Relay Switch for a 2003 Jeep Cherokee is located behind the bumper on the passenger side underneath the headlight.
There are two ways of accessing it:
1. Remove the bumper.
2. Remove the pasenger side headlight assembly and cut a hole in the plastic underneatch click on the link below for more info.
The relay seems to be a common replacement item for this vehicle. One cause of the failure is that the relay overheats, per a note inserted in the replacement part packaging.
The cutout method is used by dealers. In one vehicle, the relay failed again after 40,000 miles or so. While replacing the relay it was noted that it was secured by one screw and it was not tight. This did not provide thermal contact with the chassis which helps cool the relay. The cause of the second failure was likely due to improper installation. Trying to work through a cutout would seem to make it difficult to get both screw isntalled securely. Furthermore, the new parts today use steel pop rivets for installation to help guarantee it will maintain proper thermal contact with the chassis. The pop rivets cannot be isntalled without removing the bumper.
It is not difficult to remove the bumper and grill to get to the relay. It sounds like a big deal but you are talking a half dozen screws and less than a dozen plastic rivets. The act of cutting a hole and working in cramped quarters has to be more difficult and it does not provide as quality a job.
Hope help with this (remember rated this post).
SOURCE: 97 dodge cooling fans stoped working
If you have checked the relay module under the fans,on drivers side,and they are fine,replace the coolant sensor,and make sure all the air is bled out of the cooling system.
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