1994 Jeep Cherokee 4.0 I-6 HP. Just replaced radiator hoses, thermostat and
cap, now can't get the air purged out of the system. Hasn't overheated yet,
but going on 200 mi trip on Fri...help

On Mon, 01 Aug 2005 15:20:01 -0400, "desertrascal"
<desertrascal@yahoo.com> wrote:

>1994 Jeep Cherokee 4.0 I-6 HP. Just replaced radiator hoses, thermostat and
>cap, now can't get the air purged out of the system. Hasn't overheated yet,
>but going on 200 mi trip on Fri...help


One way is to partially fill the truck with coolant / water about 3
inches from the top of the radiator opening. Let truck run with the
heater engaged until thermostat comes one, fill radiator to near full
and let thermostat cyle on and off a few times. Do not "rev" the
engnie, just let it idle. Truck will bleed itself. Do all of this
with the radiator cap off. After the truck has cylced the thermostat
a few times and you have filled the radiator reasonably full, put the
radiator cap back on and then fill the overflow containt to the proper
level.

Many of the newer vehicles have a bleed screw or vent in the system
that you would use to do essentially the same thing.

The above can be hard to do depending on the configuration of the
radiator / hoses and the positon of the radiator in relation to the
engine.

You have to allow a way for the air to escape, either through an open
system or through some type of venting.

Elbert
---
Elbert Clarke
elbert.clarke@**adelphia.net
remove ** to email

run vehicle to normal temp with radiator cap on , then let cool never open
hot . refill radiator to top also add to coolant resevior

You need to check the top heater hose to make sure it isn't up higher
than the rad along it's run.

I then warm them up with the cap off and heater on and make sure it is
full then. Then I cap it with the overflow full to the hot mark or
above the full cold.

I have had to point the nose of the Jeeps up on a bank so the rad is the
highest spot while doing this also depending on the heater hose route.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

desertrascal wrote:
>
> 1994 Jeep Cherokee 4.0 I-6 HP. Just replaced radiator hoses, thermostat and
> cap, now can't get the air purged out of the system. Hasn't overheated yet,
> but going on 200 mi trip on Fri...help

"" wrote:
> 1994 Jeep Cherokee 4.0 I-6 HP. Just replaced radiator hoses,
> thermostat and
> cap, now can't get the air purged out of the system. Hasn't
> overheated yet,
> but going on 200 mi trip on Fri...help

If you fill it up and fill overflow a little extra it should "burp"
out during the next few heat and cool cycles.

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"Elbert" wrote:
>On Mon, 01 Aug 2005 15:20:01 -0400, "desertrascal"
><desertrascal@yahoo.com> wrote:
>
>>1994 Jeep Cherokee 4.0 I-6 HP. Just replaced radiator hoses,
>thermostat and
>>cap, now can’t get the air purged out of the system.
>Hasn’t overheated yet,
>>but going on 200 mi trip on Fri...help
>
>
>One way is to partially fill the truck with coolant / water about 3
>inches from the top of the radiator opening. Let truck run with the
>heater engaged until thermostat comes one, fill radiator to near full
>and let thermostat cyle on and off a few times. Do not "rev" the
>engnie, just let it idle. Truck will bleed itself. Do all of this
>with the radiator cap off. After the truck has cylced the thermostat
>a few times and you have filled the radiator reasonably full, put the
>radiator cap back on and then fill the overflow containt to the
proper
>level.
>
>Many of the newer vehicles have a bleed screw or vent in the system
>that you would use to do essentially the same thing.
>
>The above can be hard to do depending on the configuration of the
>radiator / hoses and the positon of the radiator in relation to the
>engine.
>
>You have to allow a way for the air to escape, either through an open
>system or through some type of venting.
>
>Elbert
>---
>Elbert Clarke
>elbert.clarke@**adelphia.net
>remove ** to email

Too much fuss, if you want to expedite it, instal a 7 to 9spi cap and
it and drive and it will burp out. I drive with them ALL THE TIME
(have for 20 years) and I have even been up pikes peak with them and
through 105 degree plains heat with A/C on and NEVER had a heating or
coolant loss problem. Plus if you do develope a leak with a 7 PSI cap
it is a LOT less violent than with a 16 PSI one.

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Latest update on problem: I have replaced thermostat, radiator hoses and
heater hoses. I filled reservoir to full and left on a 120 mile trip. It
was about 105 ambient temperature with the A/C on. About half way through
the trip the engine temp gauge come on. I pulled over to check. The
reservoir was about an inch above the full mark. Turned off the A/C,
turned on heater and allowed the engine to cool down. That happened two
more times, until I left the A/C off. This morning I had to add about ½
quart of coolant to radiator and the reservoir is still about ½ to 1 inch
above full mark. Anymore suggestions?

Well 'both' of my Jeeps remained airlocked for over a year with crap for
internal heat until I rerouted the top heater hoses and sat the Cherokee
on the hill so the rad was the highest part and heated it up with the
caps off like I mentioned before.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

desertrascal wrote:
>
> Latest update on problem: I have replaced thermostat, radiator hoses and
> heater hoses. I filled reservoir to full and left on a 120 mile trip. It
> was about 105 ambient temperature with the A/C on. About half way through
> the trip the engine temp gauge come on. I pulled over to check. The
> reservoir was about an inch above the full mark. Turned off the A/C,
> turned on heater and allowed the engine to cool down. That happened two
> more times, until I left the A/C off. This morning I had to add about ½
> quart of coolant to radiator and the reservoir is still about ½ to 1 inch
> above full mark. Anymore suggestions?

If you install a tee-connector (for flushing your heater
core, e.g., Prestone kits have them) on your heater hose
from the bell-housing/thermostat, you could easily bleed the
air out that way. Did that on my '81 CJ-7 many many winters
ago... unscrewed the cap just enough to have it loose but
not falling off (I believe I used electrical tape around the
cap/hose to keep it in place), ran the engine until the
thermostat opened and it didn't take long for the air to
bleed out. You may want to put a rag over the tee to keep
the hot coolant from spraying all over the engine
compartment. Heck, you could use the tee later to flush
your heater core...

Regards,
Franko

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F4FCAC.9B3A0218@sympatico.ca...
> Well 'both' of my Jeeps remained airlocked for over a year
with crap for
> internal heat until I rerouted the top heater hoses and
sat the Cherokee
> on the hill so the rad was the highest part and heated it
up with the
> caps off like I mentioned before.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in
'00
> 88 Cherokee 235 BFG AT's
>
> desertrascal wrote:
> >
> > Latest update on problem: I have replaced thermostat,
radiator hoses and
> > heater hoses. I filled reservoir to full and left on a
120 mile trip. It
> > was about 105 ambient temperature with the A/C on. About
half way through
> > the trip the engine temp gauge come on. I pulled over to
check. The
> > reservoir was about an inch above the full mark. Turned
off the A/C,
> > turned on heater and allowed the engine to cool down.
That happened two
> > more times, until I left the A/C off. This morning I had
to add about ½
> > quart of coolant to radiator and the reservoir is still
about ½ to 1 inch
> > above full mark. Anymore suggestions?

"desertrascal" wrote:
>Latest update on problem: I have replaced thermostat, radiator hoses
>and
>heater hoses. I filled reservoir to full and left on a 120 mile trip.
>It
>was about 105 ambient temperature with the A/C on. About half way
>through
>the trip the engine temp gauge come on. I pulled over to check. The
>reservoir was about an inch above the full mark. Turned off the A/C,
>turned on heater and allowed the engine to cool down. That happened
>two
>more times, until I left the A/C off. This morning I had to add about
>½
>quart of coolant to radiator and the reservoir is still about ½ to 1
>inch
>above full mark. Anymore suggestions?

You may be overheating from a bad clutch fan or a plugged radiator
core. Also every time you take the cap off hot to check levle in
radiator you are kinda defeating the systems design to purge itself
when it cools after being hot.

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