Closed to open radiator cooling stystem
10-08-2014, 05:22 PM
#16
Senior Member
Join Date: Mar 2013
Location: Texas
Posts: 691
Likes: 0
Received 2 Likes
on
1 Post
Year: 1993
Model: Cherokee
Engine: 4.0L
You said the temp gauge never went on so I assumed you meant it wasn't working.
'93 rad doesn't have a switch for the e-fan so where do you have that plugged in? There are threads with info about these conversions. I don't recall but assume others have mounted a switch in one of the hoses.
I thought maybe you were using the cap off the old closed system rad. (in fact I guess we didn't what rad you were using.) Caps for the open system are cheap and more complex than they seem at first glance. You might try a new one if the old one refuses to open. I don't know what the statistics say, but my '93 rarely overflows little, if any, coolant into the overflow bottle at engine shut off. More I would assume if the system was really overheated.
'93 rad doesn't have a switch for the e-fan so where do you have that plugged in? There are threads with info about these conversions. I don't recall but assume others have mounted a switch in one of the hoses.
I thought maybe you were using the cap off the old closed system rad. (in fact I guess we didn't what rad you were using.) Caps for the open system are cheap and more complex than they seem at first glance. You might try a new one if the old one refuses to open. I don't know what the statistics say, but my '93 rarely overflows little, if any, coolant into the overflow bottle at engine shut off. More I would assume if the system was really overheated.
10-08-2014, 05:44 PM
#17
Junior Member
Thread Starter
Join Date: Apr 2014
Posts: 98
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
You said the temp gauge never went on so I assumed you meant it wasn't working. '93 rad doesn't have a switch for the e-fan so where do you have that plugged in? There are threads with info about these conversions. I don't recall but assume others have mounted a switch in one of the hoses. I thought maybe you were using the cap off the old closed system rad. (in fact I guess we didn't what rad you were using.) Caps for the open system are cheap and more complex than they seem at first glance. You might try a new one if the old one refuses to open. I don't know what the statistics say, but my '93 rarely overflows little, if any, coolant into the overflow bottle at engine shut off. More I would assume if the system was really overheated.
10-08-2014, 08:52 PM
#18
Newbie
Join Date: Jul 2011
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
You sure you ran it long enough to heat up and open the tstat? Was the top hose hot? For the initial run, leave the rad cap off and keep the rad filled before and after the tstat opens and the top hose is hot. If youre idling it could take 10-15 min or even more in cold weather.
10-09-2014, 12:27 AM
#19
Junior Member
Thread Starter
Join Date: Apr 2014
Posts: 98
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
You sure you ran it long enough to heat up and open the tstat? Was the top hose hot? For the initial run, leave the rad cap off and keep the rad filled before and after the tstat opens and the top hose is hot. If youre idling it could take 10-15 min or even more in cold weather.
10-09-2014, 01:15 AM
#20
Once you start it, bleed the head ... unscrew the temp sensor on the back of the head until coolant comes out. Tighten back up, and check hoses. I usually add a bleed valve to my upper rad hose because I'm and impatient old fart.
The 4.0 head has a nasty habit of getting airlock from time to time.
You can replace both heater hoses with direct runs of 5/8" heater hose direct from pump/thermo to the core.
My first coolant recovery bottle was a Fast Orange bottle modified for duty and jammed between the fender and the airbox (worked great until I added a 92 bottle and bracketry).
I only did my conversion (1.5yrs ago) because my stock rad was crumbling to dust and the pressure bottle had more cracks than I could count.
Recently added a late model water tube and an HO thermo housing (moved the ECT there as well)
The 4.0 head has a nasty habit of getting airlock from time to time.
You can replace both heater hoses with direct runs of 5/8" heater hose direct from pump/thermo to the core.
My first coolant recovery bottle was a Fast Orange bottle modified for duty and jammed between the fender and the airbox (worked great until I added a 92 bottle and bracketry).
I only did my conversion (1.5yrs ago) because my stock rad was crumbling to dust and the pressure bottle had more cracks than I could count.
Recently added a late model water tube and an HO thermo housing (moved the ECT there as well)
Thread
Thread Starter
Forum
Replies
Last Post
Gauge
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
15
09-15-2015 07:52 PM
Cherokeegirl89
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
09-11-2015 06:13 PM
nrwphoto
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
09-09-2015 10:41 PM
synergy58
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
27
09-08-2015 11:51 PM
Azzy
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
09-08-2015 10:49 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)