Heater bypass valve

555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
I have installed my princess auto cab heater and it works great--to great, I'm down to my t-shirt. I was thinking of putting in a 3 way valve on one of the lines to the heater therefore I could restrict some flow and return that anti-freeze back to the rad. Has anyone tried this.??? I did try one off those amazon valves with the four ports, it was junk, so I just have the lines direct to and from the heater. THKS
 

ctfjr

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L3800HST
Dec 7, 2009
1,291
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central ct
Wouldn't think it would matter where in the circuit it was. If you haven't changed the flow rate in that loop then inserting a partial bypass of the heater core would only drop the flow through the core. The result would be less heat out of it. the total flow in the circuit would be the same.
 

BXHoosier

Well-known member

Equipment
BX24
Jan 21, 2018
376
308
63
Indiana
I have my heater plumbed with a 3-way valve under the hood to bypass the heater. There are two types of 3-way valves. One style has one inlet and can select only one of the outlets at a time. The other style has one inlet and it can select one or the other or a combination of both outlets. Mine is the first style since I had it already. The other style would give the ability to regulate the flow through the heater without restricting the flow since the other coolant would be able to circulate through the other outlet.
BBA960A0-615C-40F6-A956-A0535376D804.jpeg
63CD9289-77EF-4388-B4BC-313F727185F3.jpeg
 
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Oil pan 4

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Equipment
L185 turbo
Sep 21, 2017
325
79
28
NM
You are probably better off returning the bypass to the coolant intake.
 

Flintknapper

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Equipment
L2350DT
May 3, 2022
643
751
93
Deep East Texas
I have installed my princess auto cab heater and it works great--too great, I'm down to my t-shirt. I was thinking of putting in a 3 way valve on one of the lines
^^^^^

Hah.....I know the feeling.

I have a 1970 Model Bronco 1/2 cab and it has three heater settings:

1. Too damn hot.
2. Somebody PLEASE turn that heater off....hot.
3. Surface of the Sun hot.


The small cab space heats up really fast.

halfcab2.jpg
 
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555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
It would help if you described exactly where in the cooling circuit you put the heater core.
Dave
I ran my heater hoses from the small 3/8" hose at the thermostat. The hoses change from 3/8's to 5/8's on heater there is no restriction according to heat I'm getting



1669165280446.png
 

555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
Wouldn't think it would matter where in the circuit it was. If you haven't changed the flow rate in that loop then inserting a partial bypass of the heater core would only drop the flow through the core. The result would be less heat out of it. the total flow in the circuit would be the same.
Thats what I was thinking also
 

Matt Ellerbee

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MX6000
Jun 27, 2019
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Canton, Georgia
^^^^^

Hah.....I know the feeling.

I have a 1970 Model Bronco 1/2 cab and it has three heater settings:

1. Too damn hot.
2. Somebody PLEASE turn that heater off....hot.
3. Surface of the Sun hot.


The small cab space heats up really fast.

View attachment 91071
My to and from beater is the same way. With the A/c too. 1997 Nissan hardbody.
F6B8B9CF-0F2F-47E5-856B-E5AB9A8C9653.jpeg
 

DustyRusty

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Equipment
BX23S
Nov 8, 2015
2,774
1,806
113
North East
I only wish that the heater on my BX23S would warm the cab to the point that I needed to open a window, but it doesn't. My old BX22 had a much better heater in it than the one that Curtis installs in the new cab design for the BX23S.
 

Dave_eng

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Equipment
M7040, Nuffield 465
Oct 6, 2012
4,804
752
113
Williamstown Ontario Canada
Wouldn't think it would matter where in the circuit it was. If you haven't changed the flow rate in that loop then inserting a partial bypass of the heater core would only drop the flow through the core. The result would be less heat out of it. the total flow in the circuit would be the same.
My concern, after seeing tractordata.com did not show a B2601 with a cab, is that the cooling circuit might have been interrupted in a non factory way.
I have not studied this model but Kubota for many years has been using a Bottom Bypass thermostat cooling system on some.
Forum Bottom bypass.jpg

This model may not use it.

I am very cautious when I do not fully understand something. My concerns may not be warranted but if someone is going to be altering a factory design best they fully understand all the issues.

Dave
 

mikester

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Equipment
M59 TLB
Oct 21, 2017
1,954
779
113
Canada
www.divergentstuff.ca
If you haven't tied into the main coolant circuit why put in a 3-way valve? My heater taps into the coolant port on the pump outlet...I just use a ball valve as a shut off.
 
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pigdoc

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G1800S
Aug 19, 2022
108
79
28
SE Pennsylvania
mikester, I had the same thought.
That's the way it's plumbed in my 1977 Dodge pickup. The ball valve is cable operated by the "Temperature" lever on the dash.

No need to bypass anything, just restrict the flow to the heater core to regulate temperature.

KISS

BTW, I wouldn't trust ANYTHING from Amazon. It all came over in a container from China.

-Paul
 
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Tx Jim

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Equipment
M7040 HDC-1,JD 4255,Ford 6700
Apr 30, 2013
1,141
98
48
Coyote Flats,Texas
I agree with pigdoc by reducing coolant flow though heater core should lower temp output of heater
 

555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
Hay 555, which PA heater did you use ?? I really,really need to BUILD a cab for my BX23S (yeah, 'summer' project , 2 years ago, not done....ooopsy...)
The # was 424003 but I can't find it now and I just bought it in Sept it was a 13,500 BTU unit, maybe its been replaced already 2yr warranty
 

555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
The # was 424003 but I can't find it now and I just bought it in Sept it was a 13,500 BTU unit, maybe its been replaced already 2yr warranty
Check out the cab I build in Fabrication section takes a lot of hours but is worth it, not a fan of aftermarket cabs to expensive
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
4,804
752
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Williamstown Ontario Canada
There are two different internal circuits for 3 way valves. This issue comes up often on large hydronic heating systems. I mention this just in case your valve is not doing what you expect.
There are two types of 3-way ball valves: L-Port and T-Port. An L-Port can send flow one way or the other or can shut it off completely. A T-Port will perform all the same flow tasks as an L-Port but cannot be shut off. In addition, the T-Port can mix flows by sending or receiving flow to/from both ways of the Tee.

Dave
 

555

Member

Equipment
B2601
Sep 15, 2022
24
38
13
Ontario
There are two different internal circuits for 3 way valves. This issue comes up often on large hydronic heating systems. I mention this just in case your valve is not doing what you expect.
There are two types of 3-way ball valves: L-Port and T-Port. An L-Port can send flow one way or the other or can shut it off completely. A T-Port will perform all the same flow tasks as an L-Port but cannot be shut off. In addition, the T-Port can mix flows by sending or receiving flow to/from both ways of the Tee.

Dave
Thanks for the info. so I think then I need the T port one
 

Dave_eng

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Equipment
M7040, Nuffield 465
Oct 6, 2012
4,804
752
113
Williamstown Ontario Canada
Thanks for the info. so I think then I need the T port one
A lot depends upon where in the fluid circuit the valve is placed.
The natural tendency is to put the valve on the inlet to the heater core but then this leaves the core exposed to the lowest air temps. If your anti freeze protection level is not up to the coldest local temps, then more thought needs to be taken. In North America we tend to forget many parts of the world are making do. Water for coolant instead of antifreeze (which they drain daily during low temp periods.) Spring wound starters because they do not have batteries or cannot afford them.
Heater temps are controlled by diverting air flow rather than restricting water flow so the heater is less likely to freeze up.

I know, a long winded answer to a simple question. Unless you are able to divert air flow then you need a L port.

dave