How should the aircon fan and radiator fan work?

[sniper261985]

oo tama intindi mo

nangyayari din yung kahit mainit na makina at naka-on ang aircon, parehong mag-auto-off ang dalawang fan kasi malamig na ang evaporator (ng aircon, nag auto-off ang compressor/condensr fan) at medyo bumaba na rin init ng coolant (nag-auto-off ang thermo switch ng rad fan) ... pero ilang seconds lang nangyayari ito, kasi mabilis din bumalik yung init ng coolant at mag-auto-on uli rad fan

Sir Kinyo, maraming salamat sa additional information. Baka yung rad fan ko hindi ko lang napapansin na umiikot no sir while driving, sabi kasi nung iba mararamdaman mo naman kahit nag-drive ka kung umikot rad fan mo. Ehehe.

Ano po pala magandang set-up nakarekta po ang radiator fan mo, ung pagka-sindi po ng makina umiikot na agad rad fan or ung automatic na iikot kapag mainit na makina? Any suggestion po? Ano po advantage and disadvantage ng nakarekta at automatic? Thanks

[JohnM]

Mabilis masira ang rad fan motor kung nakarekta at additional load din ito sa electrical system.

[mark_celiz09]

Automatic dapat. Mag-oon dapat kapag mainit na un makina at mag-ooff kapag lumamig. Un ung original setup niya talaga. hehe

[sniper261985]

Mabilis masira ang rad fan motor kung nakarekta at additional load din ito sa electrical system.

Thank you sir, buti nalang automatic po ung set-up nung sakin. Muntik kona pinagawang rekta kasi ung kia ng kapatid ko rekta, tapos tinignan ko din ung sa kasama ko sa work rekta din, buti nakapag-tanong tanong ako dito sa forum, akala ko hindi normal ung akin. Ehehe. Salamat po sa lahat ng mga expert na tumutulong dito sa forum.

[sniper261985]

Automatic dapat. Mag-oon dapat kapag mainit na un makina at mag-ooff kapag lumamig. Un ung original setup niya talaga. hehe

Thank you sa input sir Mark, laki po tulong ng thread mo. Big Thanks po.

[bennykennel]

anong sasakyan sir? merong mga sasakyan isa lang ang radiator at aircon fan..

Hyundai getz crdi oto ko. 1 lang fan nya. Normal na na aandar lang ang fan pag nakabukas ang aircon? Totally ayaw gumana ng fan pag nakapatay aircon e

[Gian Paulo]

Ok Sir, so always on ung AC fan kapag naka-ON ung AC. Di siya mamatay.

Upon starting gumagana na yung radiator fan and tuloy tuloy na. Seem nakarekta yung radiator Fan as soon inistart ang engine. Ganun po ba dapat? Walang auto na nangyayari. Baka yung gumawa sometime ng AC ko nirekta nya. May effect po ba sa FC yun. Ride is a 1st Gen Adventure. Thanks.

[jvnj]

Upon starting gumagana na yung radiator fan and tuloy tuloy na. Seem nakarekta yung radiator Fan as soon inistart ang engine. Ganun po ba dapat? Walang auto na nangyayari. Baka yung gumawa sometime ng AC ko nirekta nya. May effect po ba sa FC yun. Ride is a 1st Gen Adventure. Thanks.

Adventure's radiator fan is mechanically linked to the engine. As long as the engine is running, the fan runs along with. Unlike the thermally (electronically) operated one's na gagana lang pag na reach na yung optimum temp. Yes, normal lang yung sa Adventure nyo since yung ang design nya.

[jhajho2111]

Thank you sir Mark sa additional input nyo sir and allowing me po na makapag-post sa thread mo. Regarding sa aircon fan and radiator fan sir sabay sila namamatay then sumisindi ulit, dko pa gaano namonitor ung fan ng aircon bago lang po kasi ung kotse sakin pero ung radiator fan confirmed kona na namamatay then sisindi ulit kapag naka-on ang aircon ko sir. Ang inaalala ko lang sir since iikot lang sila kapag naka-sindi ang aircon pano kaya kapag hindi po ako nag-aircon, dahil walang fan baka mag-overheat makina. Tulong naman po sa mga expert dyan. Ano po ang normal behavior dapat ng aircon and radiator fan? Thanks

sir ganyan din sakin pag patay ang aircon di gumagana ang rad fan ko normal po ba yon kc baka mag overheat po ako chevrolet spinz po 1.5 yong sasakyan pa help namn po

[jhajho2111]

Thank you sir Mark sa additional input nyo sir and allowing me po na makapag-post sa thread mo. Regarding sa aircon fan and radiator fan sir sabay sila namamatay then sumisindi ulit, dko pa gaano namonitor ung fan ng aircon bago lang po kasi ung kotse sakin pero ung radiator fan confirmed kona na namamatay then sisindi ulit kapag naka-on ang aircon ko sir. Ang inaalala ko lang sir since iikot lang sila kapag naka-sindi ang aircon pano kaya kapag hindi po ako nag-aircon, dahil walang fan baka mag-overheat makina. Tulong naman po sa mga expert dyan. Ano po ang normal behavior dapat ng aircon and radiator fan? Thanks

ganyan din sakin sir ano po gagawin po pagganyan normal bayon sir yong sasakyan sir pinz chev 1.5 2015 pa po puede pong patulong po

[dr. d]

from what i remember,
in cars that have their engines positioned laterally,
with the aircon off, the engine's thermostat will turn the radiator aux fan on or off, depending on engine temp.
with the aircon compressor running, the aux fans for radiator and for aircon will both run.

[runner10]

Yesterday i saw the "overheat" indicator light up in my 2015 Honda City's dashboard. So I immediately pulled over and checked under the hood. Upon my own observation, my radiator & reservoir had enough water. Radiator aux fan was working -- it turned on automatically when it reaches a certain temp. However, I noticed that when I turn on the AC, the aircon aux fan does not turn on. The aircon aux fan should turn on immediately when I turn on the AC, correct or does it only turn on when it reaches a certain temp? Anyway, it did not turn on at all even with the AC turned on for 10mins -- as such, i suspect this was the cause of the overheating.

Is this normal? Should the AC aux fan immediately turn on simultaneously with turning on the AC or does it have to hit a certain temperature before it turns on? Any idea how much to replace AC aux fan motor and the best place to have this replaced na hindi sa Casa???

Thanks in advance mga ka-City for your advise on my problem.

[oj88]

Based on my experience with Hondas, both fans should run at full speed whenever the A/C compressor is running, no matter what the engine temp is.

[dr. d]

with the aircon control set to maximum cool,
that aircon aux fan should rotate, regardless of what the radiator aux fan is doing.

bring it to the aircon shop.
the aux fans should be easy to troubleshoot.
bypassing the thermostat/relay should turn it on.

[shadow]

Based on my experience with Hondas, both fans should run at full speed whenever the A/C compressor is running, no matter what the engine temp is.

This sabay talaga dapat pag bukas ang a/c


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[oj88]

For something as critical as aux fans, they should already have a locked-rotor signal in this day and age. We take that for granted in PC CPU and case fans for well over 20 years. Cars with aux fans has been around much, much longer with the potential for engine damage much higher.

It can either report back to the ECU the RPM of the aux fans and compare it with acceptable values, OR at the least, detect if the fan rotor isn't turning when it should. So when the fan(s) don't achieve a certain speed or has stopped turning, it could trigger a DTC.

[dr. d]

For something as critical as aux fans, they should already have a locked-rotor signal in this day and age. We take that for granted in PC CPU and case fans for well over 20 years. Cars with aux fans has been around much, much longer with the potential for engine damage much higher.

It can either report back to the ECU the RPM of the aux fans and compare it with acceptable values, OR at the least, detect if the fan rotor isn't turning when it should.

my overheating sentra was one such. the problem had been going on for some months, and i couldn't see the problem.
it was solved when an old-timer mechanic showed me the way.
"umi-ikot naman, ah! malakas pa nga, oh. tignan nyo."
"boss, bili ka nang bagong aux fan, and i will show you just how strong it should be."
he was right.
by my estimate, my old fan was rotating at about half of what it should be. it would have passed muster, to the in-experienced like me.

another time,
i was losing coolant, and i couldn't see from where.
finally, i (or rather, my mekaniko) saw it.
it was a leaking 4 inch long black rubber hose, near the intake manifold. i didn't even know there was a hose there. i couldn't see it because of the jumble of electrical wiring above it.

[Miles_on]

The old 90's box type Sentra (SGX model ata?) of my classmate's dad had a weird quirk.
If you don't switch on the A/C, you'll see the thermostat rising until it hit the red & mag-o-overheat siya.
They demonstrated it to me several times when I'd hitch a ride with them. I don't think the fans switched on at all if the A/C is off.

Perhaps this was a design flaw of that model, or baka may sira lang talaga unit nila...

[dr. d]

The old 90's box type Sentra (SGX model ata?) of my classmate's dad had a weird quirk.
If you don't switch on the A/C, you'll see the thermostat rising until it hit the red & mag-o-overheat siya.
They demonstrated it to me several times when I'd hitch a ride with them. I don't think the fans switched on at all if the A/C is off.

Perhaps this was a design flaw of that model, or baka may sira lang talaga unit nila...

this might be similar to the old honda city that was discussed years ago.
that car's radiator aux fan was dead.
as a result, the engine would overheat.
but the driver noticed that the engine would get cooler if the aircon was turned on.
as it turned out, when the aircon was turned on, the aircon's aux fan turned on and cooled both the aircon heat exchanger and the radiator behind it.

i also had a minor issue with my 97 sentra.
when i had my aircon fixed in banawe, upon putting back together, speed 1 was higher than speed 2.
i complained that they probably put it back wrong. but they showed me that indeed, their connections were correct.
we got another control, and upon installation as per specified wiring connection, the result was the same: stronger 1 and weaker 2.
explanation???
"ibalik na lang nyo sa kung papano nyo unang nakita."
that did it. putting it back the 'wrong way' and it was back to normal. 1 weak, 2 stronger, and 3 strongest.
highs.

[yapoy86]

dun sa toyota altis, pag malamig pa then on AC, mag ON na din aux fan pero nasa speed 1 lang.. pag nasa operating temp na with AC, mag speed 2 na ang aux fan

eto sa mazda3 parang ganun din.. mas tahimik lang yung aux fan compared dun sa altis..