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Over Cooliing 46 235 #1334101 Sun Nov 17 2019 06:43 PM
Joined: Jan 2010
Posts: 195
L
Lend-Lease 1.5 Offline OP
Shop Shark
Hello Gents,

I have a cooling issue with my 46 235 1.5T. The truck doesn't get anywhere near 180 degrees resting between 140-160 and I'd like to to achieve full temperature. I've replaced the thermostat twice which is a 180 degree. I've changed the temp gauge.
The truck has an original radiator which I've had fixed and cleaned out. What other issues could cause it to run cooler rather than hotter? Could the heat riser be stuck wide open and would this account? Thanks

Re: Over Cooliing 46 235 [Re: Lend-Lease 1.5] #1334121 Sun Nov 17 2019 08:29 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
Try covering part of the radiator with a piece of cardboard to restrict the airflow through the core. If the temperature rises then, it might be necessary to use a 195 degree thermostat. Is the radiator an original equipment item, or has a newer, more efficient one been installed? In general, the thermostat controls the minimum temperature the engine runs, and the cooling capacity of the radiator sets the upper limit. A "too big" radiator can cool things down to the point that the thermostat can't raise the temperature sufficiently. Have you tried checking the thermostat to see where it actually opens by putting it into a pan of hot water on a stovetop?
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Over Cooliing 46 235 [Re: Hotrod Lincoln] #1334184 Mon Nov 18 2019 12:24 PM
Joined: Jan 2010
Posts: 195
L
Lend-Lease 1.5 Offline OP
Shop Shark
I've checked both thermostats and both work well. The radiator is original and the big 3 core. I'm changing the exhaust manifold as the gasket is blown in two spots and the heat riser shaft is broken off where the spring connects.

Re: Over Cooliing 46 235 [Re: Lend-Lease 1.5] #1334192 Mon Nov 18 2019 01:55 PM
Joined: Mar 2019
Posts: 384
G
glenns towing Offline
Shop Shark
History on the truck? How long you had it? Outside temp when "overcooling" is happening? Cruising or idling? Fan being used? Water pump pully size?

Re: Over Cooliing 46 235 [Re: glenns towing] #1334207 Mon Nov 18 2019 03:41 PM
Joined: Jan 2010
Posts: 195
L
Lend-Lease 1.5 Offline OP
Shop Shark
I've had the truck for 11 years, 46 1.5 to 235. Stock Radiator and fan for big truck. New water pump in 2012, will not warm at any temp, even at 90 degrees outside. stock pulley and belt. make no difference cruising or idling.
This only started several years ago, before it ran perfect heated to exactly 180

Last edited by Lend-Lease 1.5; Mon Nov 18 2019 03:43 PM.
Re: Over Cooliing 46 235 [Re: Lend-Lease 1.5] #1334208 Mon Nov 18 2019 03:48 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
How are you measuring the temperature? Try using a laser temp gauge pointed at the top of the thermostat housing, the top radiator tank, and various heights of the radiator core. I'm going to guess you've got a gauge that has gotten inaccurate for some reason. Also, try removing the temp sensing bulb and submerging it in a pan of boiling water. It should read 200+ degrees if the gauge is accurate.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Over Cooliing 46 235 [Re: Hotrod Lincoln] #1334213 Mon Nov 18 2019 04:25 PM
Joined: Jan 2010
Posts: 195
L
Lend-Lease 1.5 Offline OP
Shop Shark
Forgot to mention I've tried two gauges

Re: Over Cooliing 46 235 [Re: Lend-Lease 1.5] #1334215 Mon Nov 18 2019 04:50 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
Did you boil test either one?


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Over Cooliing 46 235 [Re: Hotrod Lincoln] #1334220 Mon Nov 18 2019 05:04 PM
Joined: Jan 2010
Posts: 195
L
Lend-Lease 1.5 Offline OP
Shop Shark
Yes I did, they are Military temp gauges used in Willys jeeps, CCKW's everything. They are a basic temp gauge, no frills. These are American made, not Chinese

Re: Over Cooliing 46 235 [Re: Lend-Lease 1.5] #1334222 Mon Nov 18 2019 05:11 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
How does a laser temp gauge read? Most people would be deliriously happy with a radiator that cools as well as yours does. Is there some overriding reason for insisting on a specific coolant temperature? If so, just block off part of the airflow until the gauge reads where you like.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

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