Definitive Coolant Temperature Thread

[fj4068]

does it have to be a 1FZ?

Yes, otherwise it wouldn't be comparing apples to apples. 3FE or different engines would be more appropriate in their respective threads.

 

[LandCruiserPhil]

Year - 1996
Mileage - 135K
Motor - normally aspirated
Head Gasket - original
Radiator Type: original
Coolant - Toyota red pre-mix
Tires - 315/75r16
Gears - 4.11
Fan Clutch - Eaton ~17k cst set at ~125° by Toolsrus
Aux. Fan / Size - none
Air Conditioner - on, high
Gauge(s) - ScanGauge II
Coolant Temps - 193° around town idling , ambient outside 110°+, 5PM, pulling lite trailer up 7% grade, 3 miles at ~4100RPM 2nd gear 65MPH, 200° at the top
Gauge - ScanGauge II
Other Comments: Original PHH

 

[Land Shark]

Year - 1997
Motor - Normally Aspirated
Head Gasket - PM'd 1/2009
Radiator Type: OEM
Coolant - 50/50 Toyota Red/Distilled, No additives, Rear heater bypass 1/2009
Tires - 285/75R16
Gears - 4.11
Fan Clutch - Late blue hub, 15k cst, 7/2010
Aux. Fan / Size - No.
Ambient Temp - 87˚F
Air Conditioner - On, High/Med.
Gauge(s) - ScanGauge II/Stock set
Coolant Temps - 184˚F-186˚F highway, 190˚F idling, on ScanGauge II
Other Comments: ARB bumper, IPF 900 XSDs, IL License plate, Safari snorkel

Yo Van,

That Ill license plate skewed your numbers

 

[Stevesnj]

Here's my info:

Year - 1996
Motor - normally aspirated
Head Gasket - Suspect replaced
Radiator - Koyo 1918 2core aluminum
Thermostat - OEM
Coolant - 60/40 Prestone Extended Orange
Tyres - 285/75r16 GY Duratrac
Gears - 4.11
Fan Clutch - OEM Blue Hub, 15k oil
Ambient Temp - 85˚F
Air Conditioner - off
Gauge(s) - UltraGauge & stock factory gauge with temp gauge mod
Coolant Temps - 186.8˚F highway, 188.6˚F - 190 idling, uphills on load 200 to 203 on UltraGauge

 

[hawker7]

Here you go,

Year - 1997
Mileage 133K
Motor - normally aspirated
Head Gasket - Unkown
Radiator - Aluminum Toyota Replaced 2 yrs ago
Thermostat - OEM replace with Radiator
Coolant - 50/50 Toyota Red; 1 year old
Tires - 315 75 GY Duratrac
Gears - 4.11
Fan Clutch - Blue Hub Stock Oil; 6 months ago
Ambient Temp - 80˚F
Air Conditioner - On HI
Gauge(s) - Torque Android App
Coolant Temps - 185.6˚F highway, 185.6˚F idling, 195˚F long uphill pull from 2800'-3200' ASL;

I replaced the OEM fan with a used blue hub, before that the temps were 190˚F to 205˚F at 45˚F just around town. The blue hub fan did the trick, I see no need to mod the oil at this time.

 

[Lpmk6]

Year - 1994
Mileage 279K
Motor - normally aspirated
Head Gasket - Unkown
Radiator - Copper core w/brass tank CSF OEM replacement .
Thermostat - OEM replace with Radiator
Coolant - 50/50 Toyota Red; 1 year old
Tires - 285/65 R16
Gears - 4.11
Fan Clutch - Blue Hub, adjusted to 95*, 25K CST
Ambient Temp - 83˚F
Air Conditioner - On HI
Gauge(s) - Koso
Coolant Temps - 185 idling, 181 at speed
AUXILIARY FAN - LCP Fan Bracket with OEM 100 series condenser fan set to run at 180 degrees.
Napier Precision Products hood vents
ARB Bull Bar with winch, 4 PIAA 6" lights. License plate relocated to fairlead position.


Original Toyota, Black hub ran 190˚F to 205˚F at 50-60˚F after 20 minutes of warmup.

 

[Railwelder93]

Year-93
Mileage- 230,000
Motor-obd1 1FZ-FE
Head gasket-I believe original, no indication of replacement.
Radiator-plastic tank Toyota replacement, 5-10 years ago.
Thermostat- new Toyota replaced 3000 miles ago.
Coolant-flushed 3000 miles ago, replaced with zerex asian.
Tires-315,75,16
Gears-4.88
Fan clutch- new, un-modified blue hub
Ambient temps locally- 60f (current temps as coolant temps recorded)
Gauge- Auto Meter
Coolant temps- 185-190 driving w/o A/C, 190-195 driving with A/C on.
Idle is consistent 180 w/o, and 185 with A/C

My numbers seem slightly unusual bc my idle temp is always lower than when driving. It always returns to 180 in a few minutes after stopping, even after having the A/C on and temps reach 190-195 driving.

Might add an electric fan to use with the A/C this summer. Also I’m considering putting in some hood vents, I can see a 5-10 degree temp drop from idle temp when the hood is open.

 

[Lpmk6]

Year-93
Mileage- 230,000
Motor-obd1 1FZ-FE
Head gasket-I believe original, no indication of replacement.
Radiator-plastic tank Toyota replacement, 5-10 years ago.
Thermostat- new Toyota replaced 3000 miles ago.
Coolant-flushed 3000 miles ago, replaced with zerex asian.
Tires-315,75,16
Gears-4.88
Fan clutch- new, un-modified blue hub
Ambient temps locally- 60f (current temps as coolant temps recorded)
Gauge- Auto Meter
Coolant temps- 185-190 driving w/o A/C, 190-195 driving with A/C on.
Idle is consistent 180 w/o, and 185 with A/C

My numbers seem slightly unusual bc my idle temp is always lower than when driving. It always returns to 180 in a few minutes after stopping, even after having the A/C on and temps reach 190-195 driving.

Might add an electric fan to use with the A/C this summer. Also I’m considering putting in some hood vents, I can see a 5-10 degree temp drop from idle temp when the hood is open.

if you keep up with the "what did you do to your 80 this weekend" thread, you can find my experience with a DIY blue fan clutch modification. I held on to my black Toyota "black hub" clutch for a long time, filled with with 15K to 30K cst fluid over the years. I did this because Tools (RIP Kevin) always sung the black hub's praises.

I've had a spare blue for a few years, did the 95* timing mod and filled with a mix of 20 and 30K cst fluid. Its crazy how well it worked. I share this with you because your 93 is identical to my 94 and the details you mentioned are similar to those I had prior to the blue hub.

After comparing the black vs the blue, the black offers more resistance even with a lighter CST fluid. Naturally, I thought this was an indication the black would outperform the blue hub. I was presently surprised by the results after installing the blue. about 10-15* difference.

 

[Railwelder93]

if you keep up with the "what did you do to your 80 this weekend" thread, you can find my experience with a DIY blue fan clutch modification. I held on to my black Toyota "black hub" clutch for a long time, filled with with 15K to 30K cst fluid over the years. I did this because Tools (RIP Kevin) always sung the black hub's praises.

I've had a spare blue for a few years, did the 95* timing mod and filled with a mix of 20 and 30K cst fluid. Its crazy how well it worked. I share this with you because your 93 is identical to my 94 and the details you mentioned are similar to those I had prior to the blue hub.

After comparing the black vs the blue, the black offers more resistance even with a lighter CST fluid. Naturally, I thought this was an indication the black would outperform the blue hub. I was presently surprised by the results after installing the blue. about 10-15* difference.

Thank you, I will strongly consider modifying my clutch first.

 

[Marco Lau]

Miles - 230,XXX
Year - 1991
Motor - 3FE
Head Gasket - OEM original
Radiator Type: Ron Davis 2 core alum.
Coolant - 50/50 Toyota Red / Distilled Water / water wetter
Radiator Cap - aftermarket 13lb
Wheels - 17 x 8.5 Raceline Monster beadlocks
Tires - 37s x 12.5
Gears - 4.88's with ARB AirLockers
Fan Clutch - Aisen modified Green hub w/ 15k oil
Aux. Fan - Dual 16" SPAL pushed fan in front of AC condenser & tranny oil cooler (use for slow 4Lo type wheeling only)
Hood louvers - YES (XJ hood louvers)
T-Stat - OEM - replaced 5k miles ago
Hoses - OEM - replaced 5k miles ago
Ambient Temp - 75˚F
Air Conditioner - On, Medium (setting 2)
Gauge(s) - Aftermarket koso water temp gauge on upper hose
Coolant Temps - 183F downhill, 185˚F @ 65mph on flat highway in OD, 192˚F hill climb +/- 2000' on 2nd @ 55-60mph @ 3800 rpm
Other Comments: F/R aftermarket bumper/winch/ sliders/ belly skid/ aftermarket roofrack/medium load

 

[1911garand]

Year - 1997
Mileage - 227K
Motor - normally aspirated
Head Gasket - original / unknown
Radiator Type: New Koyo
Coolant - Store brand universal red pre-mix
Tires - 315/75r16
Gears - 4.11 Stock Gearing
Fan Clutch - New Blue Hub Fan Clutch, No Mods
Aux. Fan / Size - none
Air Conditioner - HIGH!
Thermostat - unknown

Gauge(s) - AUTOOL OBD2 EUOBD (love it!)

Cheap and Easy OBDII Display

Lots of talk lately about coolant temps and how bad the OEM temp gauge is. I didn't want to spend much $, but wanted a real coolant temp display. Found this and love it - 500 miles on it so far. It does way more than coolant temp: Pros: -easy set up and configure the screen - almost plug in...

forum.ih8mud.com

Coolant Temps - Coolant temp maxed out @ 199f when towing 18' walleye boat, fully loaded, AC on high 55-75 MPH @ 85F. All other driving coolant temps fluctuate 179-183f - normal.

Other Comments: Original PHH, rear heater removed / bypassed, heater control valve REMOVED.

 

[sandcruiser80]

Year - 1997 LX450
Mileage Original blew up (New Motor had 120k before I resealed it) stripped down to block and new gaskets and hoses to finished motor.
Motor - normally aspirated
Head Gasket - OEM New
Radiator - New OEM
Thermostat - New OEM
Coolant - 50/50 Toyota Red
Tires - 275/70/16 Stock
Fan Clutch - Wits End Blue Hub
Ambient Temp - 80 F
Air Conditioner - On HI
Gauge(s) - Ultra Gage
No Lift, it’s just a stock LX with a resealed motor. Original pistons and crank and original head and valves.
Coolant Temps - 176 Before I flushed the Tranny (fluid looked good) and now it runs at 172.4 all the time but I live at sea level and it never sees hills or mountains. It will climb up to 176 in traffic and iv hit 181.5 while driving on the soft sand with full tire pressure lol. Highest iv seen was in the summer on 105 plus days with 100% humidity and A/C full blast and it ran at 186 but never went higher even sitting in stopped traffic. My dash needle sits just a hair lower then half, and comes up it half in traffic and such.

It also gets 16 mpg city and 18 mpg highway somehow...