Hello,
Hope I can find a solution to my Subaru legacy 1998 problem from your technical engineers because I spend a lot of money and time without any solution.
The problem is that when I put the key to turn on the car and when I still in the second step before the ignition, the AC fan (cooling system) of the radiator turn on. This system will be normal if the radiator is so hot and /or when the air-conditioning is on. However in our case the fan turned on anytime of the day (morning- evening..).
I checked the water in the radiator, it was in the normal level, I changed the thermostat because maybe there is a problem in it and it is not working properly but nothing happened, I changed the sensor of water temperature but nothing happened. Also we made a scan to the car’s computer and everything is normal.
Please can you advise me what I should do or what is the problem?
I hope that problem happened with your technical engineers.
Best Regards
Gabriel
Doesn't take a technical engineer to find what could be the problem ! Looking a wiring diagram I see three relays that are used to turn on the cooling fans ! One of the relay's contacts are stuck closed causing Battery voltage to be applied to one of the fans when you turn the key to the on position . Your best bet , take it to a qualified repair shop .
SOURCE: check engine light stays on, on my 1999 Subaru Legacy
take it to autozone they will check it for free
SOURCE: 1990 subaru legacy
make sure you bleed the air out of the system on the top left hand side of the radiator or the car will overheat due to air lock
SOURCE: overheating
Have you checked to see if the radiator fan works? And have you checked to see if the water pump works? Two very important items key to overheating.
SOURCE: 1991 subaru legacy the radiator fans are not
you may need a relay or the rans may be bad you can ck the fans by wiring them direct to a postive and a ground
SOURCE: 1990 subaru legacy
I hope this helps : A lot of people, even mechanics overlook the dramatic effects of "air lock" as described above. This is especially prominent in BMW's because they seem more "picky". Your cooling system (every cooling system) is balanced just well enough to nearly always keep your engine cool when operating properly. Sometimes a pocket of air does become trapped at one of the higher points ion the system however. This air pocket acts like a blanket trapping heat in the one dry area, in addition to impeding air flow. I would start WITH THE ENGINE COLD, by adding a radiator flush tee in to the heater hose leading to the intake. Start the car with the flush cap off, and the radiator cap. Play with the hoses and try to keep this tee higher than the fill cap on the radiator, to let out any air. When water is seen at the tee, cap it off and fill the radiator all the way, with the engine running, as to fill the entire block. Keep in mind that with the engine running, you kind of need to hurry. In only a few minutes, the water will get hot enough to start spewing from the open radiator (don't worry you have plenty of time, assuming it's all the way cooled down) I have seen many people leave their radiator half full, because it takes some time for the water to trickle all the way down through the runners on the radiator, and it looks full even though there is "air" (it's technically hydraulic pressure, like a siphon) holding it up. Hope fully that is the problem. You already re- did the whole system. Check your igniton timing too. Sometimes that can contribute to an overheat as well.
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