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#1443250 Thu Mar 03 2022 04:18 AM
Joined: Jun 2008
Posts: 1,716
S
'Bolter
Is a 180° thermostat correct for a 1955 235 or should I get one that opens up a little sooner? Gets hot here in south Texas during the summer and I don’t want to over heat.

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Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Joined: Feb 2004
Posts: 24,563
H
Kettle Custodian (pot stirrer)
A thermostat sets the minimum operating temperature- - - - - -the condition of the radiator and the volume of air across it determines how much hotter, if any, that the coolant will get once the thermostat opens. The only exception to that rule might be if the engine idles for a long period of time in very hot weather. Are you running an original radiator, or an aftermarket one that's rated for higher pressure? Ditto for the heater core. A 1955 truck probably had a 7 pound radiator cap that allowed the coolant to reach 233 degrees F. before it boils.
Jerry


"Freedom's just another word for nothing left to lose"
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Joined: Jun 2008
Posts: 1,716
S
'Bolter
Jerry, I’ve still got the original Harrison radiator and original heater core in my 1950 1/2 ton. The newly acquired 235 is a 1955 model.


Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Joined: Feb 2004
Posts: 24,563
H
Kettle Custodian (pot stirrer)
OK- - - -I believe the 1950 models had either a "zero-pressure" radiator, or no more than a 4 PSI rating. Does the overflow line come from the filler neck above the radiator cap gasket, or is it incorporated into a canister high up on the top radiator tank? With a low or "no pressure" system, it might be wise to use a 160 degree stat. The only downside will be poor heater performance in cold weather. Be very sure the cooling system is clean and leak-free.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Joined: Jan 2014
Posts: 2,075
J
'Bolter
This brings up a question in my mind. I purchased the copper/brass “direct replacement” radiator from Jim Carter several years ago. I always assumed it was a a low/no pressure unit just like the original Harrison it replaced. So I just re-used the cap from the Harrison.

Now I’m wondering what the replacement is rated for. How would I tell?

JW51 #1443320 Thu Mar 03 2022 08:42 PM
Joined: Oct 2021
Posts: 389
O
'Bolter
Call Jim Harrison and ask him.

My 1950 216 has the original radiator and a 4 lb cap.

Have you been having over heating problems that can be traced to your thermostat? If not, I'd leave it alone and keep an eye on things. If it acts up and the thermostat is to blame you can always change it later.

I once overthought a similar situation and thought I had a problem when I didn't. I reduced the T stat from a 195 to a 180 on 1972 Monte Carlo. The temp gauge was showing 230-240 under normal operation. I thought that was bad. (car ran fine)

I put in the lower temp T stat and the car ran like total crap! It never got hot enough to run right until I put the 195 back in and let the engine get hot.

Last edited by Otto Skorzeny; Thu Mar 03 2022 08:52 PM.

1939 Packard Standard Eight Coupe
1950 Chevrolet 3100
1956 Cadillac Coupe de Ville
1966 Oldsmobile Toronado
1966 Ford Mustang
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150
1995 Ford F-150
Joined: Aug 2005
Posts: 9,496
Ex Hall Monitor
This is for a 54. They don't have 55 truck listed. It should be the same.
http://chevy.oldcarmanualproject.com/chevyresto/54151.htm


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Tiny #1443339 Thu Mar 03 2022 11:40 PM
Joined: Sep 2001
Posts: 31,572
Bubba - Curmudgeon


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Joined: Oct 2012
Posts: 128
D
'Bolter
You guys are over engineering this.
If you put in a 160 thermostat a 235 will run at 180 F
If you put in a 180 thermostat a 235 will run at 180 F
It is the design of the engine.
I have tried both and each runs at 180 F.
Doug

Joined: Aug 2005
Posts: 9,496
Ex Hall Monitor
You are undoubtedly correct however the OP asked what is "correct", not what will work. The "correct" thermostat is listed in the link Tim posted above.


Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Let's go Jared!
Name your dog Naked so you can walk Naked in the park.
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