Radiator fan adjustments?

General discussion about our beloved Tercel 4WD cars
Post Reply
User avatar
Kozuto_98
Top Notch Member
Posts: 187
Joined: Fri Jun 26, 2020 3:45 pm
My tercel:: 1987 SR5 Wagon
Location: Nova Scotia, Canada

Radiator fan adjustments?

Post by Kozuto_98 »

I'm not sure if this is common with these old Tercels.
I find my radiator fan comes on a bit too late compared to my coolant temp, and doesn't really stay on long enough.

What could I do to adjust the point at which the radiator fans comes on and turns off without manually turning it on or off?

This is the only cooling problem I have left to sort out with my wagon. I have just recently replace the water pump, thermostat, radiator, and done fresh coolant. All of this already has made a big difference compared to when I first the car.

The radiator fan issue I described only really happens when the car has been idling for a bit.
1987 Tercel Wagon SR5 4WD
1997 Acura CL
RIP 2016 Civic (wrist pin recall)
User avatar
ALiveSR5
Top Notch Member
Posts: 144
Joined: Fri Sep 18, 2020 7:58 pm
My tercel:: 1985, SR5, 4WD, 6-speed manual, Wagon.
Location: Pennsylvania USA

Re: Radiator fan adjustments?

Post by ALiveSR5 »

Could it be the temperature sensor at the bottom of the radiator going bad?
No other vehicle that I have ever owned had a heart and soul like my 1985 Tercel SR5 4WD Wagon. :D
~
Great minds may think alike but it is the doers who see their visions become reality. :?
User avatar
Kozuto_98
Top Notch Member
Posts: 187
Joined: Fri Jun 26, 2020 3:45 pm
My tercel:: 1987 SR5 Wagon
Location: Nova Scotia, Canada

Re: Radiator fan adjustments?

Post by Kozuto_98 »

ALiveSR5 wrote: Wed Oct 21, 2020 7:21 pm Could it be the temperature sensor at the bottom of the radiator going bad?
It's certainly a possibility, but it still seems to work fine. I'm mainly looking for a method to turn the fan on earlier and to stay on a bit longer
than it currently does.
1987 Tercel Wagon SR5 4WD
1997 Acura CL
RIP 2016 Civic (wrist pin recall)
User avatar
NWMO
Highest Ranking Member
Posts: 1070
Joined: Wed May 20, 2015 1:08 pm

Re: Radiator fan adjustments?

Post by NWMO »

I would consider replacing the sending unit mentioned. They may even have something with a lower switch point. If you are just watching the guage, I would slso suggest a temp measurement to confirm what the guage roughly indicates.
Psalm 37:4 "Delight yourself in the Lord and he will give you the desires of your heart"

In remembrance of my friend ARCHINSTL:

T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"

"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain
User avatar
Kozuto_98
Top Notch Member
Posts: 187
Joined: Fri Jun 26, 2020 3:45 pm
My tercel:: 1987 SR5 Wagon
Location: Nova Scotia, Canada

Re: Radiator fan adjustments?

Post by Kozuto_98 »

NWMO wrote: Wed Oct 21, 2020 9:35 pm I would consider replacing the sending unit mentioned. They may even have something with a lower switch point. If you are just watching the guage, I would slso suggest a temp measurement to confirm what the guage roughly indicates.
Alrighty! I'll give that a try.
1987 Tercel Wagon SR5 4WD
1997 Acura CL
RIP 2016 Civic (wrist pin recall)
User avatar
Petros
Highest Ranking Member
Posts: 11570
Joined: Sun Jan 28, 2007 6:31 pm
My tercel:: '84 Tercel4wd w/extensive mods
Location: Arlington WA USA

Re: Radiator fan adjustments?

Post by Petros »

there is no adjustment, it is controlled by the sensor. could be the sensor going bad. they do not cost much. I would check out the actual on/off temps as specified in the FSM, and replace it if it is out of spec.
'87 Tercel 4wd SR5 (current engine swap project)
'84 Tercel 4wd (daily driver, with on going mods)
'92 Mazda MPV 4wd (wife's daily driver)
'85 Tercel 4wd DLX auto(daughter's daily driver)
'01 Honda Civic (other daughter's daily driver)
Post Reply