jpolaski@[EMAIL PROTECTED]
wrote:
> I found out that there was no thermostat at all in the Jeep,
> and now that I have a new one in there it is still overheating.
That implies someone else tried to fix it before selling it off. How
old is the rad? Those wide short rads physically plug up easy.
>
> It overheats in about 20--30 minutes after starting it in the
> morning. Boiling water/air bubbles seem to be comming up from
> the bottom of the overflow tank
>
> I'll check out the fan clutch tonight.
That is a likely suspect, even the OEM one I got from the $tealer****p
only lasted 5 years. Mud destroys the seals on them fast by the way...
Also, I'll try flu****ng
> the system again, but with a stronger chemical.
I recommend you remove the lower rad hose and give it a good flush. I
usually get literally handfuls of flakes out of them. Also inspect the
vanes on the rad. the engine 'will' overheat when the fins are down to
about 60% left or 40% missing.
> You are right -- it didn't help. The previous bottle's
> cap was barely on.
Too bad, that 'open system' cap is a notorious one for letting the
pressure out causing overheating.
Be warned that some of the new ones are defective. The cap doesn't
match the bottle threads or there is a ridge in the bottle's sealing
surface so the cap doesn't seal. Watch for antifreeze stains or steam.
>> Oh and there hasn't been an open system since about 1975.
>> They are all a closed system with pressurized caps and
>> overflow tanks.
Wrong! Jeep used it up until 1992. It was an AMC design I believe.
> Really? My mistake... Thanks for letting me know. I had read
> the Jeep switched the Cherokee to an "open" system in 1992
> or so, and I thought most automotive cooling systems were
> low/no pressure.
That is a fully pressurized system using 'only' the 'overflow' bottle
and it's cap to hold pressure. The Jeep rad does not have a rad cap on
it.
It still operates under pressure like most modern systems.
This makes these a real bugger to get the air out of also. Sometimes I
and others I have seen and read about need to have the nose of the
Cherokee up in the air, like up on a bank to allow the air to all burp
out, they really needed a bleeder on them, but AMC didn't include one.
>
> Thanks for your help!
Good Luck!
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08. Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com
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