180* T-Stat ? HELP
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Professional
Joined: Nov 2011
Posts: 207
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From: California
So I went to a Radiator shop today, the guy used an infrared temp gun.
Lower hose at the block read 108*
Top hose at top of thermostat housing read 147*
This seems very low to me, is this normal or is his gun bad ?
Also, while truck is running there is no pressure in the system, I can take the Rad cap off, not even hot.
Also the hoses and radiator are hot but I can hold onto them without getting burned, system seems very cool but gauge still shows 200-210*
Lower hose at the block read 108*
Top hose at top of thermostat housing read 147*
This seems very low to me, is this normal or is his gun bad ?
Also, while truck is running there is no pressure in the system, I can take the Rad cap off, not even hot.
Also the hoses and radiator are hot but I can hold onto them without getting burned, system seems very cool but gauge still shows 200-210*
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
Then I think its very possible your stock stat may be malfunctioning or was mistakenly swapped for a 180 because both his arrow and guage read exactly what I got with both stats on mine respectively...of course these guages arent exactly swiss watches on our trucks either...
Last edited by Augiedoggy; Dec 1, 2011 at 10:43 PM.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
According to my scan tool..Matco Determinator ....as I recall....my 95 5.2 goes into closed loop at 140 degrees, so at that point the computer uses the 02 sensor to keep the fuel mixture at 14.7 to 1. So if it runs 180, or 195 degrees shouldn't the fuel mixture be the same? My long term trims are pretty close to 0. So the computer isn't adding extra fuel or it would show up there.
I have seen vacuum leaks show a +25 on the trim where the computer is adding extra fuel to try to get to 02 sensor to switch between rich and lean. Like I said I never lost any mileage with 180's in either of mine. Winter mileage will suffer because the cold air is denser ....more oxygen...so more fuel to keep it at 14.7 to 1 which is more related to intake air temp than a 15 degree difference in engine temp......As a side note...had a 96 Dakota 3.9 in the shop today, clogged oil pickup tube and a pan with a mess in the bottom. Owner says he does regular oil changes??? .....I will keep my 180's in mine.
I have seen vacuum leaks show a +25 on the trim where the computer is adding extra fuel to try to get to 02 sensor to switch between rich and lean. Like I said I never lost any mileage with 180's in either of mine. Winter mileage will suffer because the cold air is denser ....more oxygen...so more fuel to keep it at 14.7 to 1 which is more related to intake air temp than a 15 degree difference in engine temp......As a side note...had a 96 Dakota 3.9 in the shop today, clogged oil pickup tube and a pan with a mess in the bottom. Owner says he does regular oil changes??? .....I will keep my 180's in mine.
Last edited by Augiedoggy; Dec 1, 2011 at 10:47 PM.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
Ya, no offense to anyone because I believe there are some really smart people on here that we should have to pay for their advice, but no one is as smart as the 50+ engineers and testers at dodge that put that 195 in there in the first place. They built the truck the best they could with the budget they had and since a t stat isn't a part that varies in cost based on its temperature range, they would definitely put in the best thermostat temperature stock.
Last edited by Augiedoggy; Dec 1, 2011 at 10:44 PM.
) I forgot about emissions lol
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
It funny this thread is just like the other 180 stat threads only in reverse where instead of everyone saying they are getting one to install they say they are gonna remove them... I think if it really had an effect on mpg you wouldnt see so many posts counterdicting themselves from different posters..
Last edited by Augiedoggy; Dec 2, 2011 at 07:57 AM.
Administrator
Joined: Apr 2010
Posts: 87,458
Likes: 4,218
From: Clayton MI
well I believe we still dont have a difinative answer on whether the truck actually runs richer with the 180 stat.... so far people who have monitored the computer a say it starts to use the o2 sensors at 140 degrees and they arent sure whats going on after 170.... Their seems to be a lot of speculating and assuming.... I wish someone had some proof... Doenst anyone have a sniffer they can check the air/fuel ratios with?
It funny this thread is just like the other 180 stat threads only in reverse where instead of everyone saying they are getting one to install they say they are gonna remove them... I think if it really had an effect on mpg you wouldnt see so many posts counterdicting themselves from different posters..
It funny this thread is just like the other 180 stat threads only in reverse where instead of everyone saying they are getting one to install they say they are gonna remove them... I think if it really had an effect on mpg you wouldnt see so many posts counterdicting themselves from different posters..
Also, it isn't JUST what the O2 sensors are telling the PCM either, PCM also pays attention to coolant temp, and the IAT, for deciding just how much gas to shoot in there. There is so much going on there, without being able to run some CONSISTENT testing, the data just isn't reliable enough.