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Old 18-04-2016, 19:02   #1
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Should pipe from rad cap to header tank be hot?

Hi

Fitted an alloy rad yesterday and was just having a feel about today and noticed the pipe from the rad cap to the header tank was warm. Should this be happening? Is it normal and is just firing coolant back to tank? Or have I got a problem here?

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Old 18-04-2016, 21:47   #2
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Anyone?
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Old 19-04-2016, 11:06   #3
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Yes, should be warm.
Purpose of this pipe is to carry excessive coolant to expansion tank once valve in the rad cap opens at set pressure. It's natural for coolant to expand under temp and build pressure, hence you have valve in the cap which opens under pre-set pressure to let excessive coolant out (to expansion tank).
Once engine is cooled down, the negative pressure builds up in system and valve in rad cap opens (it's two-way valve) under vacuum, sucking back coolant from expansion cap. For that reason you have two marks on tank "max" and "min".
So, if excessive hot coolant is pushed out to tank, hose should be hot from coolant.
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Last edited by swinks; 19-04-2016 at 18:18..
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Old 19-04-2016, 17:09   #4
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Excellent mate. Thanks for the help. Least I know I have nothing to worry about lol.
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Old 20-04-2016, 00:15   #5
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Old 20-04-2016, 18:14   #6
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Probably worth doing a head gasket check, they push fluid into the expansion tank when the head gasket is on its way out.
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