pressure in upper rad hose
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Posting Guru
Joined: Mar 2012
Posts: 1,011
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From: MI
pressure in upper rad hose
Hey guys, just recently did waterpump, new 3core alum rad and new hoses and new 13lb cap. Truk is a 91 7.3 n/a
after a bit of driving i notice my rad is very! Hot to the touch (i assume around 190f or so), stock ****ty gauge reads ok and truck drives fine, but the upper rad hose is very firm even after shutdown untill the truck cools down. Is this normal? Or is there still an air bubble somewhere? i only had the mech fan fully lick on once when i was doing in town driving for 5 hours with a fully unlocked converter.
after a bit of driving i notice my rad is very! Hot to the touch (i assume around 190f or so), stock ****ty gauge reads ok and truck drives fine, but the upper rad hose is very firm even after shutdown untill the truck cools down. Is this normal? Or is there still an air bubble somewhere? i only had the mech fan fully lick on once when i was doing in town driving for 5 hours with a fully unlocked converter.
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
I got a question to, instead of starting a thread for it, it's basicly the same as this.
My upper rad hose, sucks it's self in when revving the engine..... but feels firm and normal cold/engine off.
Whats the deal with that? Tired rad hose?
My upper rad hose, sucks it's self in when revving the engine..... but feels firm and normal cold/engine off.
Whats the deal with that? Tired rad hose?
Elder User
Joined: Feb 2012
Posts: 888
Likes: 2
You need a new radiator cap. Yours is not allowing coolant back in from the overflow bottle causing a vacuum in the radiator therefore collapsing the hose.
Elder User
Joined: Feb 2012
Posts: 888
Likes: 2
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
I guess the bad rad cap would also explain the missing gallon of coolant in the rad when I bought this van. Doesn't have any coolant leaks, so with a rad cap not holding pressure, it was just boiling out of the system.
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