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84_CJ7 08-17-2004 12:10 PM

Radiator Low in \'84 CJ7 258
The radiator is running low in my '84 CJ7 258. It has the stock radiator and overflow tank. The overflow tank is full (more than full) but it doesn't pull the coolant back into the radiator after cooling down. I replaced the radiator cap (15 lbs) on the chance that it wasn't allowing the return. It appears to have helped, but still falls short of refilling the the radiator. I can find no leaks and the thing runs like a top. Any ideas?


Olin18 08-17-2004 12:20 PM

Re: Radiator Low in \'84 CJ7 258
When you replaced the Rad cap, did you replace the soft rubber line that runs from the Rad to the overflow bottle. If that line is old, it may be cracked in places. When the fluid cools down and sucks on that tube, if it has cracks the Rad will suck only air, and not the fluid out of the overflow bottle. even if you can not see visable cracks in the line, if it is old, replace it. All it would take to cause a problem like you descrive would be a couple of pin holes.

bleoh 08-17-2004 12:22 PM

Re: Radiator Low in \'84 CJ7 258
Maybe a small leak somewhere in the system so you are sucking in some air rather than from the overflow. Check out hoses, water pump and heater core. If your hoses are at the end of their expected life I would replace them as a first step if you don't find anything on close inspection. After that all I could say is leak test it with dye.

84_CJ7 08-17-2004 12:32 PM

Re: Radiator Low in \'84 CJ7 258
Sometimes I can't see the forest for the trees. I checked the return line for obstructions but not for pin-holes. That replacement is first on my list. Thanks.

New (7 mos) heater core and heater hose. Replaced the thermostat at the same time. No water pump leaks. I guess those big hoses need to be relieved of duty next. Thanks.


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