How long can a engine run without a rad?
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Elder User
Joined: Feb 2014
Posts: 878
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From: british columbia, canada
How long can a engine run without a rad?
So I,ve got the clip off the truck, but I would like to move it in and out without having to hook up the rad. My plan is to connect the upper and lower hoses together with a connector and connect the 2 heater hoses into a loop. Do you think I should remove the t stat for this move or leave it in. I don,t think I,ll have the truck running for more than 3 or 4 min at a time, what you all think??? thanks
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,188
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From: S/W Missouri, Polk county
As long as you connect everything like you said, you should be ok for a short running time. I think taking out the t-stat is a good call also.
No breaking in a cam or major burn outs though...lol
No breaking in a cam or major burn outs though...lol
Senior User
Joined: Aug 2002
Posts: 149
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From: Amarillo TX
From a cold start, it take several minutes for your engine to come to operating temp(thermostat opening). If you connect the hoses with water in it, you can run it that same amount of time. Without water, just a bit less time. Don't try to rely on you temp gauge, it takes water temp.
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Hotshot
Joined: Feb 2004
Posts: 10,808
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From: The Shenandoah Valley
I had the thought to say the same thing until I saw you already did ... 
Yeah, without any coolant it'll heat up much faster than it will "with".
I'ld run coolant, not just water if it were mine and if I wanted to keep that water pump. I'ld connect the rad hoses with a piece of exhaust tubing and run a loop on the heater hoses. Coolant also is a better lubricant for water pumps plus this way, the gage tells you something.
Yeah, without any coolant it'll heat up much faster than it will "with".
I'ld run coolant, not just water if it were mine and if I wanted to keep that water pump. I'ld connect the rad hoses with a piece of exhaust tubing and run a loop on the heater hoses. Coolant also is a better lubricant for water pumps plus this way, the gage tells you something.
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