Why Won't ECT Reach 181* ?
Thread Starter
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Senior User
Joined: Sep 2014
Posts: 337
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From: Jasper, Texas
Why Won't ECT Reach 181* ?
Hi guys, new oem thermostat, new coolant temp sensor. Took a 200 mile trip at highway speeds, (65-85 mph) and my coolant range was between 159* and 165*. The EOT was between 200* and 204*.
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Posting Guru
Joined: Mar 2014
Posts: 1,468
Likes: 5
From: Salt Lake City, utah
Did you buy the thermostat and housing combo or just the thermostat? When I replaced mine with the Mishi I noticed my housing was worn to one side so I replaced the housing. Did you check to make sure it was seated correctly in the housing before install?
Senior User
Joined: Jan 2017
Posts: 428
Likes: 2
From: Central Illinois
Sounds like it's stuck open. After reading so many posts about the hi dollar mishimoto tstats needing to be boiled to open all the way first to ensure proper seating, I decided to boil my gates tstat before i put it in. It just seems like the extra 15 minute procedure at the kitchen stove is definitely worth doing on ANY tstat prior to install and makes a whole lotta sense imo.
Posting Guru
Joined: Nov 2011
Posts: 1,664
Likes: 4
From: Southern AZ
Hi guys, new oem thermostat, new coolant temp sensor. Took a 200 mile trip at highway speeds, (65-85 mph) and my coolant range was between 159* and 165*. The EOT was between 200* and 204*.
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Richard
Senior User
Joined: Jan 2017
Posts: 428
Likes: 2
From: Central Illinois
Delta isn't of concern unless the coolant system is operating normally. Coolant temp must be in the normal range first before true delta is an issue.
Cargo Master
Joined: Aug 2012
Posts: 2,856
Likes: 936
From: Kaufman TX
EOT is about where it should be if coolant temps are normal, so I'm actually a little skeptical of the ECT sensor on this one. Might be worth verifying that the cold temp reading is accurate.
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Senior User
Joined: Sep 2014
Posts: 337
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From: Jasper, Texas
FiznUKa
No, I had my local shop do the work.
Bumblebee04
Looks like it's coming out for a trip to the kitchen. Seems to me that Motorcraft is having QC problems. The original stuck closed on me. Good thing that I noticed and shut her down. Also out of a set of 8 reman Motorcaft injectors, 3 have been waranty replaced.
DarkStarMedia
I agree with Bumblebee04, the EOT is where it should be.
seijirou
The temp sensor was replaced with the tstat, however you have a good point. How can there be a +/- 40* difference between the two fluids. I think I'm going to start with the sensor connector.
Thanks guys
No, I had my local shop do the work.
Bumblebee04
Looks like it's coming out for a trip to the kitchen. Seems to me that Motorcraft is having QC problems. The original stuck closed on me. Good thing that I noticed and shut her down. Also out of a set of 8 reman Motorcaft injectors, 3 have been waranty replaced.
DarkStarMedia
I agree with Bumblebee04, the EOT is where it should be.
seijirou
The temp sensor was replaced with the tstat, however you have a good point. How can there be a +/- 40* difference between the two fluids. I think I'm going to start with the sensor connector.
Thanks guys
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More Turbo
Joined: May 2015
Posts: 670
Likes: 13
From: Nampa, ID
The further away from 200f your coolant is, the higher your delta is going to be. With an OEM thermostat, you should see at least 190f cruising on the highway. With a mishimoto 200f thermostat, the "magic" 15f delta cutoff becomes a 12-13f delta cutoff.
Something is out of whack if you are seeing coolant temps that low. There is a possibility you got a bad thermostat out of the box. There is also a good chance that the thermostat housing is aftermarket and the OEM thermostat is opening prematurely as a result.
when i upgraded to a mishimoto 200f t-stat, i noticed the existing aftermarket thermostat was a different length. I bit the bullet and bought a new OEM t-stat housing (dealer would only sell it with a new t-stat). The OEM t-stat was the exact same length as the mishimoto. I installed the mishimoto with the motorcraft housing and had no issues. If i had noticed the difference in time, the mishimoto t-stat would have likely still fit in the aftermarket housing, leaving me with further issues.
Something is out of whack if you are seeing coolant temps that low. There is a possibility you got a bad thermostat out of the box. There is also a good chance that the thermostat housing is aftermarket and the OEM thermostat is opening prematurely as a result.
when i upgraded to a mishimoto 200f t-stat, i noticed the existing aftermarket thermostat was a different length. I bit the bullet and bought a new OEM t-stat housing (dealer would only sell it with a new t-stat). The OEM t-stat was the exact same length as the mishimoto. I installed the mishimoto with the motorcraft housing and had no issues. If i had noticed the difference in time, the mishimoto t-stat would have likely still fit in the aftermarket housing, leaving me with further issues.
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Thread Starter
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Senior User
Joined: Sep 2014
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From: Jasper, Texas
brandonrr
So they make aftermarket tstat housings that are dementionaly different than OEM? If so that makes sence, I had the radiator and tstat replaced a couple of years back. That shop may have used the aftermarket housing and tstat (I had no problems then). The new shop used a Motorcraft tstat and if they're not compatible, I may have a bypass situation.
Thanks
So they make aftermarket tstat housings that are dementionaly different than OEM? If so that makes sence, I had the radiator and tstat replaced a couple of years back. That shop may have used the aftermarket housing and tstat (I had no problems then). The new shop used a Motorcraft tstat and if they're not compatible, I may have a bypass situation.
Thanks
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
I'd start with a cold reading to verify both are close in temperature to say... they work.
Next is the connector, mine does this occasionally, wiggle the connector, readings change. Next boil the t-stat and verify the fitment with the housing in the pot with the T-stat... go from there, its good or bad, doesn't fit, won't fully open/close or you have a connector issue.
Next is the connector, mine does this occasionally, wiggle the connector, readings change. Next boil the t-stat and verify the fitment with the housing in the pot with the T-stat... go from there, its good or bad, doesn't fit, won't fully open/close or you have a connector issue.
More Turbo
Joined: May 2015
Posts: 670
Likes: 13
From: Nampa, ID
brandonrr
So they make aftermarket tstat housings that are dementionaly different than OEM? If so that makes sence, I had the radiator and tstat replaced a couple of years back. That shop may have used the aftermarket housing and tstat (I had no problems then). The new shop used a Motorcraft tstat and if they're not compatible, I may have a bypass situation.
Thanks
So they make aftermarket tstat housings that are dementionaly different than OEM? If so that makes sence, I had the radiator and tstat replaced a couple of years back. That shop may have used the aftermarket housing and tstat (I had no problems then). The new shop used a Motorcraft tstat and if they're not compatible, I may have a bypass situation.
Thanks
The parts store thermostats come with the housings. The autozone unit that was in my truck was shorter than OEM.
Posting Guru
Joined: Dec 2016
Posts: 1,284
Likes: 2
From: Bozeman MT
Hi guys, new oem thermostat, new coolant temp sensor. Took a 200 mile trip at highway speeds, (65-85 mph) and my coolant range was between 159* and 165*. The EOT was between 200* and 204*.
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Why won't it warm up? Can an EGR delete cause the cold nature due to no exhaust temperatures reaching the EGR cooler and the engine coolant?
Should I try the Mitso 200*? or could the motorcraft thermostat be malfunctioning?
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Block the entire front of the radiator with a sheet of cardboard. Watch the temp closely. If it comes up into the 186+ operating range then the thermostat is prematurely opening. If you allow it to get warm enough you'll also hear the fan speed ramp up. Remove the cardboard and watch the temp drop. Replace thermostat.