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.

 

Weird. I'm thinking factory defect.

 

X 2. Replace the hose and ditch the restriction.

 

Restricter is to try and stabilize temps. When tstat opens (brand new), it cools too quickly. System is air free and all new HD components.

 

Just let it do its thing man, everythings gonna be OK.

 

If it did not come from the factory, it does not need to be there.

 

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!

 

Oh absolutely. Plan on it tomorrow. Just wanted to make sure they couldn't have been caused by something of mine.

 

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.

 

When I bought it I specified for heater hose, and I think it even labels it on the hose somewhere. I wondered the same thing.

 

I just put regular bulk heater hose on mine. Nothing special needed for the XJ cooling system.