What thermostat
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Mountain Pass
Joined: May 2012
Posts: 186
Likes: 1
From: Voorhees NJ
What thermostat
Ok, so I've been here before asking this question. I can't get any heat in the cab. I've checked the door and temp levers and they both work. ( the system is non-a/c)The temp dial hardly moves. The hoses get hot. This is another motor in the truck.(had the same problem with original motor, both are 351M) I'm thinking it could be the thermostat. I'm using a 165 degree. Should I replace it with a 195? Will the 195 run to hot in summer?
Cargo Master
Joined: Oct 2005
Posts: 2,298
Likes: 26
From: NJ
180* is safe, 195* is fine if you want extra heat. Anything under 180* will appreciably reduce heater output and increase engine wear. No reason to run that cold a thermostat unless you are fighting detonation on a high compression engine.
Also, for extra blow motor RPM and air output you can wire the blower motor up through a relay.
Also, for extra blow motor RPM and air output you can wire the blower motor up through a relay.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
180* is safe, 195* is fine if you want extra heat. Anything under 180* will appreciably reduce heater output and increase engine wear. No reason to run that cold a thermostat unless you are fighting detonation on a high compression engine.
Also, for extra blow motor RPM and air output you can wire the blower motor up through a relay.
Also, for extra blow motor RPM and air output you can wire the blower motor up through a relay.
180 T-stats lead to longer warm ups increased engine wear and shortens oil life. The ONLY time you should run a 180 is if you are trying to mitigate over heating when running a 195.
Engine wear increases drastically as soon as you get under 180F you want to get the engine temp up to op temp as quickly as possible.
The results from the below chart are at just 60 hours or 3600 miles at 60MPH and that is cylinder bore wear. Wanna shave tens of thousands of miles off the life span of your engine run a 180 or colder t-stat.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
195° is what it shipped with. There is no advantage to running a colder temperature thermostat and all kinds of problems if you do.
No heater output is one of them.
No heater output is one of them.
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Cargo Master
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From: NJ
The sheer volume is misinformation in this section of the forum is staggering.
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Cargo Master
Joined: Dec 2004
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From: Florence, SC
For the record, I run a 195* thermostat in my truck. I live in the South East, where temperatures in the Summer are often well above 100* and humidity even worse. The engine was bored 0.060, and I don't have any issues.
Post Fiend
Joined: Feb 2008
Posts: 5,831
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From: St Albert, Alberta
If that is what you think, then the only thing staggering would be your lack of knowledge.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The correct thermostat specifically for 351C/351M/400:
D0AZ-8575-A .. 192 degree Thermostat (Motorcraft RT-139) / Obsolete ~ Available NOS and from some auto parts stores.
1970/79 Passenger Cars; 1977/79 F100/350; 1978/82 Bronco; 1980/82 F150/350 & Econoline.
Ford never offered a 180 t/stat for these engines, so I have to wonder what the hell t/stat you guys are using.
D0AZ-8575-A .. 192 degree Thermostat (Motorcraft RT-139) / Obsolete ~ Available NOS and from some auto parts stores.
1970/79 Passenger Cars; 1977/79 F100/350; 1978/82 Bronco; 1980/82 F150/350 & Econoline.
Ford never offered a 180 t/stat for these engines, so I have to wonder what the hell t/stat you guys are using.
Thread Starter
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Mountain Pass
Joined: May 2012
Posts: 186
Likes: 1
From: Voorhees NJ
What thermostat
So I changed the thermostat this morning. Found that I had put in a Mr. Gasket 180 deg. Put in a 195 and WOW! I now get heat in my truck after 14 years. Thanks!
Posting Guru
Joined: Jul 2015
Posts: 2,239
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From: Northeast Ohio USA
Agreed, and may I add.... staggering pompous responses. If we "knew it all", there would be no need for this, or any forum.
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