coolant questions
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Mountain Pass
Joined: Dec 2011
Posts: 143
Likes: 8
coolant questions
Hello
So today i decided to change my thermostat because i thought my old one might be bad. I went with the 195 fail safe for my 390.
my truck ran around 150 constantly, except when i idled it would rise pretty fast. that is why i changed the thermostat. now that i have the new one, the truck runs around 190-200 constantly :/ and it still rises in temp but not as fast.
So question number one is does the thermostat affect how hot your engine runs?
Q-2. How do i know if the new one is working?
Q-3. What do your old 390's run at?
Q-4. I have never used antifreeze coolant.... doesnt freeze where i am. I was told dont do that anymore... so what would be the proper amount to put in it?
Thank you!
So today i decided to change my thermostat because i thought my old one might be bad. I went with the 195 fail safe for my 390.
my truck ran around 150 constantly, except when i idled it would rise pretty fast. that is why i changed the thermostat. now that i have the new one, the truck runs around 190-200 constantly :/ and it still rises in temp but not as fast.
So question number one is does the thermostat affect how hot your engine runs?
Q-2. How do i know if the new one is working?
Q-3. What do your old 390's run at?
Q-4. I have never used antifreeze coolant.... doesnt freeze where i am. I was told dont do that anymore... so what would be the proper amount to put in it?
Thank you!
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
These old trucks wont sit & idle long without getting hot, keep it moving 20 mph & you can pitch the fan. 180º T-stat is what it was designed to use. It opens at that temp,
I have lived in North Carolina all my life where it freezes. 50/50 mix is recommended here. Don't know what would be correct for a no freeze zone.
Sounds like the old T-stat was working properly. I don't sweat the gauge setting too much as long as it stays the same.
John
I have lived in North Carolina all my life where it freezes. 50/50 mix is recommended here. Don't know what would be correct for a no freeze zone.
Sounds like the old T-stat was working properly. I don't sweat the gauge setting too much as long as it stays the same.
John
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Mountain Pass
Joined: Dec 2011
Posts: 143
Likes: 8
thanks guys, sounds like im in the clear. my engine is performance built, think i should hop back down to the 160 tstat? I believe thats what was in there before and all autozone carried was the 195 fail safe and the 160.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Anti freeze is also called coolant. The thermal conductivity on glycol based coolant is a little less than straight water but it also has all the rust and corrosion additives, plus it raises the boiling point. Every engine I ever ran on straight water turned to an ugly rusty mess real quick and often the water pump took a dump in short order too.
Water wetter is good.
Water wetter is good.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
John
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