What could cause this?
12-08-2012, 11:23 AM
#1
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Was checking under the hood of my 91 xj for leaks as well as to evaluate the removal of my leaking p/s pump when I saw something very wierd.
What would cause pinhole leaks in my heater hose? It seems almost like a factory error because there are multiple holes evenly spaced apart just barely burping coolant one hot drop at a time.
Edit: heater hose is literally at most a month old. It couldn't have anything to do with the grade 8 washer I put in the upper rad hose as a restricter could it? Coolant is fresh, all cooling components new or only a year or so old.
What would cause pinhole leaks in my heater hose? It seems almost like a factory error because there are multiple holes evenly spaced apart just barely burping coolant one hot drop at a time.
Edit: heater hose is literally at most a month old. It couldn't have anything to do with the grade 8 washer I put in the upper rad hose as a restricter could it? Coolant is fresh, all cooling components new or only a year or so old.
12-08-2012, 05:09 PM
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Originally Posted by Bustedback
X 2. Replace the hose and ditch the restriction.
12-08-2012, 07:49 PM
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Year: 90,84
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Engine: 4.0,2.5
A leaking hose is a bad hose. Whatever somebody was thinking with a "restrictor" is probably a bad idea. Anyway the system pressure will be pretty much independent of any restrictions. Would mostly be a result of the temperature. Far from a positive displacement piston, or diaphragm type pump, a centrifugal, auto type water pump just "persuades" flow. I wouldn't ever expect any "notable" pressure from one. (they CAN, but these don't). I'd change a hose that leaks!
Last edited by DFlintstone; 12-08-2012 at 08:13 PM. Reason: restrictor, persuades
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12-08-2012, 09:04 PM
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Originally Posted by DFlintstone
A leaking hose is a bad hose. Whatever somebody was thinking with a "restrictor" is probably a bad idea. Anyway the system pressure will be pretty much independent of any restrictions. Would mostly be a result of the temperature. Far from a positive displacement piston, or diaphragm type pump, a centrifugal, auto type water pump just "persuades" flow. I wouldn't ever expect any "notable" pressure from one. (they CAN, but these don't). I'd change a hose that leaks!
12-08-2012, 09:40 PM
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Year: 1998
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Might seem like an odd question. But is it actual heater hose for the application? Or just generic 3/4? inch hose? It might not be rated for higher temperatures.
12-09-2012, 08:13 AM
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Originally Posted by Lead Foot
Might seem like an odd question. But is it actual heater hose for the application? Or just generic 3/4? inch hose? It might not be rated for higher temperatures.