fan control relay
- Thread starter Grimsin
- Start date
Scottydoggs
Killa Bee
block 1/2 the rad with cardboard.
blueguy
The Blue One
Ummm.
My car has a 160* and the heat works just fine.
The fans kick on based on what Will probably set in your file.
You can always pull each one of the fuses and test em; but my car heats up just fine...just have to go out and start it a few minutes before I leave. The rating of the T-Stat is actually 10-15*~ lower than what the car actually runs at anyways, because according to my old aero scans on my blue car and this green bucket of junk...my non-drilled 160* always runs at 172-175*~ once up and going. My blue car sat around 175~ as well cruising. 180~ on a hot day in traffic. Rated temps are a bit misleading. I'd honestly tell you if you haven't, do a full flush of the system.
My car has a 160* and the heat works just fine.
The fans kick on based on what Will probably set in your file.
You can always pull each one of the fuses and test em; but my car heats up just fine...just have to go out and start it a few minutes before I leave. The rating of the T-Stat is actually 10-15*~ lower than what the car actually runs at anyways, because according to my old aero scans on my blue car and this green bucket of junk...my non-drilled 160* always runs at 172-175*~ once up and going. My blue car sat around 175~ as well cruising. 180~ on a hot day in traffic. Rated temps are a bit misleading. I'd honestly tell you if you haven't, do a full flush of the system.
Scottydoggs
Killa Bee
you could also unplug one fan i bet with out any issues.
Grimsin
New member
found this description
"In low speed mode, "fan cont 1" supplies power to fan 1, then the cooling fan relay #3 routes the power into the second fan, which always has ground on the negative side. Fan relay 2 is off in this mode. This provides half the voltage to each fan, which results in low speed operation (which is quiet). What if one fan stops working and the circuit cannot be completed? The low speed mode doesn't work. But if the engine temperature gets high enough, the high speed mode kicks in. High speed mode will come on any time the engine coolant temperature is too high, not only if low speed mode fails.
In high speed mode, fan relays 1 and 2 are on. Instead of routing power through the second fan, fan relay 3 switches fan 1 to ground. The result is both motors running at full speed, because they are both given the full system voltage.
Aside from expensive transistor controls for the fans (which I can't say I've ever seen in a production car), this is the best way to do it. Many other vehicles that have a high and low speed have two relays. The high speed puts power directly to the fan, while the low speed goes through a resistor that drops the voltage. That wastes power in low speed mode (turned into heat by the resistor), but the worst part is that the ones I've seen turn the low speed off when the high speed comes on. If the high speed fuse blows or there is a problem anywhere in the control system, the fan doesn't run, which leads to overheating when stopped or driving at low speed. Some also have dual-winding motors with the same relay setup (minus the resistor), but the fan still stops working if there is a problem with the high seed circuit when high speed is commanded on.
The 3-relay system can have any one component fail and it will still work, in most cases it functions well enough that there are no cooling problems."
so If I take out the 3rd relay I should be good..right?
"In low speed mode, "fan cont 1" supplies power to fan 1, then the cooling fan relay #3 routes the power into the second fan, which always has ground on the negative side. Fan relay 2 is off in this mode. This provides half the voltage to each fan, which results in low speed operation (which is quiet). What if one fan stops working and the circuit cannot be completed? The low speed mode doesn't work. But if the engine temperature gets high enough, the high speed mode kicks in. High speed mode will come on any time the engine coolant temperature is too high, not only if low speed mode fails.
In high speed mode, fan relays 1 and 2 are on. Instead of routing power through the second fan, fan relay 3 switches fan 1 to ground. The result is both motors running at full speed, because they are both given the full system voltage.
Aside from expensive transistor controls for the fans (which I can't say I've ever seen in a production car), this is the best way to do it. Many other vehicles that have a high and low speed have two relays. The high speed puts power directly to the fan, while the low speed goes through a resistor that drops the voltage. That wastes power in low speed mode (turned into heat by the resistor), but the worst part is that the ones I've seen turn the low speed off when the high speed comes on. If the high speed fuse blows or there is a problem anywhere in the control system, the fan doesn't run, which leads to overheating when stopped or driving at low speed. Some also have dual-winding motors with the same relay setup (minus the resistor), but the fan still stops working if there is a problem with the high seed circuit when high speed is commanded on.
The 3-relay system can have any one component fail and it will still work, in most cases it functions well enough that there are no cooling problems."
so If I take out the 3rd relay I should be good..right?
Scottydoggs
Killa Bee
if cindy is on a train going 75 mph on a 300 mile trip she left the station at 2 pm., and has a bushel of apples and she eats one every 20 minutes, what time will she arive and how many apples will she have eaten? lmao. thats what i just read up there.....:th_scratchhead:
BillBoost37
New member
I'm from another camp.
Change the damn fan temp setting in the pcm and be done.
Change the damn fan temp setting in the pcm and be done.
BillBoost37
New member
ps..
Cindy would arrive at 12noon because she crossed time zones and the train was haulin aaaaaaaa, as for the apples, that depends on the coefficient of the variable at a certain temperature given a few deviations.
Cindy would arrive at 12noon because she crossed time zones and the train was haulin aaaaaaaa, as for the apples, that depends on the coefficient of the variable at a certain temperature given a few deviations.
blueguy
The Blue One
BillBoost37
New member
No one reads your posts.
BillBoost37
New member
Are you still talking?
BillBoost37
New member
blueguy
The Blue One
Gonna have to block you like Snowflake
Nah, you'd miss me too much, unlike your buddy
BillBoost37
New member
Nick would just let you back in.. what's the use.
Grimsin
New member
its not overheating, I want the temp gauge to go past 180.
Ill get a flush when I have time, i work 13-14 hour shifts 5 days a week and have to many things to do when I finally get to the weekend.
I want to disable one fan OR make it so it goes only goes in low speed mode and does not kick the highspeed fans on when the temp hits 180
I would change the temp setting if someone local was around to do so, I'm not mailing pcm in and paying for a simple change. then my car would not be driveable either as I have no extra pcm...
if someone could chime in without filling the thread full of nonsense that would be greatly appreciated as I have a 3 month old baby that id like to keep warm when i drive the car until I can find someone to change the tune.
Ill get a flush when I have time, i work 13-14 hour shifts 5 days a week and have to many things to do when I finally get to the weekend.
I want to disable one fan OR make it so it goes only goes in low speed mode and does not kick the highspeed fans on when the temp hits 180
I would change the temp setting if someone local was around to do so, I'm not mailing pcm in and paying for a simple change. then my car would not be driveable either as I have no extra pcm...
if someone could chime in without filling the thread full of nonsense that would be greatly appreciated as I have a 3 month old baby that id like to keep warm when i drive the car until I can find someone to change the tune.