coolant temp 39 deg!
Thread Starter
|
Senior User
Joined: Dec 2006
Posts: 176
Likes: 1
From: Dundas, IL
coolant temp 39 deg!
Well that's what autoenginuity is saying. This was after driving around for about 2 hours and hooking it up as soon as we got home. Noticed the coolant temp needle never reached the N i NORMAL and was curious as to what the temp was. I know there are 2 senders, one for the guage and one for the PCM both are reading low so maybe my thermostat is stuck? Definately want an excuse for the dieselsite 203 thermostat and this might be my ticket. maybe the 39 was celcius, but the others aren't.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
If you have an auto Trans , the PCM does not report coolant temp ...one sending unit is for the gauge , the other is for the light ...If it is in Celsius , 39 = 102 F
My Wag ,is coolant temp is always 39 , warm or cold
My Wag ,is coolant temp is always 39 , warm or cold
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Trending Topics
Posting Guru
Joined: Mar 2008
Posts: 1,669
Likes: 1
From: Billerica, MA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / Worst Features Of The 2025+ Ford Expedition
Brett Foote
10 Ways Ford is LOSING to the Competition
Joe Kucinski
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
This is a post by Curtis (pocket) :
The only trucks that it would affect are the 6-speeds. All automatics do not have a separate coolant temp sensor, other than the sensor for the gauge. The PCM does not have an input for coolant temps.
However, the 6-speeds do have a secondary sensor mounted on the water pump, and it does input directly to the PCM.
However, the 6-speeds do have a secondary sensor mounted on the water pump, and it does input directly to the PCM.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
my manual trans will throw a random number every time for coolant temp. One time i check it on the scanguage will show me say 170* then the next time it will say 250*. it's weird, but i go by the oil temp anyways. coolant temp shouldn't be far off from the oil temp and my oil temp gets up around 203-205*. My truck is a '95 model thus came stock with a 203* T-stat so thats pretty much right on the money.
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
No, I don't think so, OBS wise.
Both coolant sensors are not connected to the PCM in any way.
Dash temp gauge is a direct connection to the coolant sensor.
Dash overheat light is a direct connection to a secondary coolant sensor.
Both coolant sensors are not connected to the PCM in any way.
Dash temp gauge is a direct connection to the coolant sensor.
Dash overheat light is a direct connection to a secondary coolant sensor.
Thread Starter
|
Senior User
Joined: Dec 2006
Posts: 176
Likes: 1
From: Dundas, IL
The 2 senders thing was just something that I thought I read on here somewhere. I did read the oil temp at the same time and it was 160 so that is for sure too low. Maybe that's where my mileage is going cause it sucks at the moment. Looks like the 203 is in my future but i hate messing with that stupid housing!
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
The 2 senders thing was just something that I thought I read on here somewhere. I did read the oil temp at the same time and it was 160 so that is for sure too low. Maybe that's where my mileage is going cause it sucks at the moment. Looks like the 203 is in my future but i hate messing with that stupid housing!
Thread Starter
|
Senior User
Joined: Dec 2006
Posts: 176
Likes: 1
From: Dundas, IL
160* oil temp is wayyy low. next time you go to start it cold put AE on it and compare oil temp to ambient temp on a dead cold engine. if the oil temp on a dead cold engine is way off from the ambient temp you could have an oil temp sensor problem. you oil temp reading that low is making your timing too high thus messing with your mileage. if the ambient temp and cold engine temp are near the same then i'd say t-stat.
