thermostat question
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More Turbo
Joined: Feb 2022
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From: New Dominion, PE
thermostat question
My truck has been running cold (barely off the C on the dash guage) since I got it. I *thought* it may have been the engine temperature sender
that displays the engine temp for the dash guage. Anyhooo....I bought a motorcraft 192 deg thermostat and housing and got around to putting it in today.
The one in the truck was a motorad 185 deg unit. These are prone to failing open I believe.... anyone have any experience with them. I'm HOPING that this
will allow the truck to get to proper operating temps and give me some joy on the gas guzzling.
that displays the engine temp for the dash guage. Anyhooo....I bought a motorcraft 192 deg thermostat and housing and got around to putting it in today.
The one in the truck was a motorad 185 deg unit. These are prone to failing open I believe.... anyone have any experience with them. I'm HOPING that this
will allow the truck to get to proper operating temps and give me some joy on the gas guzzling.
Thread Starter
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More Turbo
Joined: Feb 2022
Posts: 653
Likes: 105
From: New Dominion, PE
My truck has been running cold (barely off the C on the dash guage) since I got it. I *thought* it may have been the sensor that controls the coolant
temp for the dash guage. Anyhooo....I bought a motorcraft 192 deg thermostat and housing and got around to putting it in today. The one in the
truck was a motorad 185 deg unit. These are prone to failing open I believe.... anyone have any experience with them. I'm HOPING that this
will allow the truck to get to proper operating temps and give me some joy on the gas guzzling.
temp for the dash guage. Anyhooo....I bought a motorcraft 192 deg thermostat and housing and got around to putting it in today. The one in the
truck was a motorad 185 deg unit. These are prone to failing open I believe.... anyone have any experience with them. I'm HOPING that this
will allow the truck to get to proper operating temps and give me some joy on the gas guzzling.
running....so I'm pretty sure that the thermostat was not working as desired.
Lead Driver
Joined: Jun 2021
Posts: 5,219
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they indeed fail open , defective by design. Literally, they are just so flowing that they cant fail closed because no such thing as being fully closed to one of those. its a joke.
The only thing left if you put it in right the new one, is to bleed the air!!! and put a proper cap on
The only thing left if you put it in right the new one, is to bleed the air!!! and put a proper cap on
Lead Driver
Joined: Jun 2021
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I clean out my overflow hose , they get plugged up in that long run from tank to radiator. They make a no spill funnel for coolant filling. wortth it.
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More Turbo
Joined: Feb 2022
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From: New Dominion, PE
ya ya....I squeezed the upper rad hose (which was purdy cold at initial startup)....several times during the running after startup. held the idle at 1500-2000 for 5 minutes and then checked things. topped up coolant as needed. I am measuring temp of engine on the metal behind the thermostat housing. it got as high as 162F. right around then, the upper hose started to get warm.
what I am noticing is that the viscous fan is running ALL THE TIME from startup. This is not right I don't think. It should kick on as needed and as controlled
by the ECU....no?
temp guage on dash did rise to about 1/4 on the guage toward the middle and then dropped back to near the C. so am seeing similar behaviour as I was with the motorad. no leaks of coolant around the
thermostat housing or hoses attached from water pump.
coolant being used is prestone 50/50 water/antifreeze/coolant.
what I am noticing is that the viscous fan is running ALL THE TIME from startup. This is not right I don't think. It should kick on as needed and as controlled
by the ECU....no?
temp guage on dash did rise to about 1/4 on the guage toward the middle and then dropped back to near the C. so am seeing similar behaviour as I was with the motorad. no leaks of coolant around the
thermostat housing or hoses attached from water pump.
coolant being used is prestone 50/50 water/antifreeze/coolant.
FTE Chapter Leader
Joined: May 2006
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From: Central Mississippi
Never fails. Put thermostat in, spend endless time fiddle-farting around deciding if it works or not.
Or... TEST before install with thermometer & a gradually heated pot of water & know for sure.
But that's too easy.
By the way, my tested Motocraft 192* cracks the seat at 190* & is fully open by 195*
Also, there is no computer control of the mechanical fan in these trucks. Purely mechanical lock based on ambient temp.
Or... TEST before install with thermometer & a gradually heated pot of water & know for sure.
But that's too easy.
By the way, my tested Motocraft 192* cracks the seat at 190* & is fully open by 195*
Also, there is no computer control of the mechanical fan in these trucks. Purely mechanical lock based on ambient temp.
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More Turbo
Joined: Feb 2022
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From: New Dominion, PE
agreed, I rushed to put things together. silly me for trusting that a new product would actually work as advertised.
they could change their motto to: "At Motorcraft, quality is #17!"
they could change their motto to: "At Motorcraft, quality is #17!"
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More Turbo
Joined: Feb 2022
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From: New Dominion, PE
fwiw...I just tested the motorad unit in a pot of water...brought it to boil and the pintle valve at the top pushed up the top once I reached around 195+. I took it out of the hot water and it's not
going back to its normal closed position. I tested that it is still open by putting some water in the block side of the thermostat and it quickly went thru the front side. so it is a dud I presume.
going back to its normal closed position. I tested that it is still open by putting some water in the block side of the thermostat and it quickly went thru the front side. so it is a dud I presume.
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More Turbo
Joined: Feb 2022
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From: New Dominion, PE
my truck came from Las Vegas. I'm betting the ECM programming was done using the California emissions standards. As such, it wants the temps up as high as possible before the ECM switchs to
closed loop.
does anyone know where I can get an ECM flash that would be setup for Eastern/Northern climate for my truck? 87 F150 with the 5.0L - C6 auto trans.
closed loop.
does anyone know where I can get an ECM flash that would be setup for Eastern/Northern climate for my truck? 87 F150 with the 5.0L - C6 auto trans.
Lead Driver
Joined: Jun 2021
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Does your VECI state "This vehicle complies with EPA regulations for model year [ ]" or something like that? nevada vehicles should be just as likely as a wisconsin vehicle to be sold as CARB compliant.
The california vehicles will say "This vehicle meets California [ or CARB] and EPA..."
The california vehicles will say "This vehicle meets California [ or CARB] and EPA..."