Heater core flush?
#1
CF Veteran
Thread Starter
Join Date: Oct 2009
Location: Fauquier County, Virginia
Posts: 2,867
Likes: 0
Received 15 Likes
on
13 Posts
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Heater core flush?
With Fall and Winter in the horizon, I was considering flushing my heater core at a later date. Besides, after cleaning out the overflow bottle and the new rad, I was in need of some new clean coolant. Because I have just replaced my rad, I really dont want to do a full system flush because I dont want any gunk building in my rad. Is it ok to just pull off the two heater core hoses from the t-stat housing and engine and plug a hose into one and have the other in a bucket? I was also just considering replacing to two hoses after I flushed it anyway. I dont want another snowy winter with medium heat lol. The 4.0 runs at 210.. its about time my heater worked with that heat.
#4
CF Veteran
Thread Starter
Join Date: Oct 2009
Location: Fauquier County, Virginia
Posts: 2,867
Likes: 0
Received 15 Likes
on
13 Posts
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Lol, God I can only imagine. Coolant gunk flying out the end like noone's biz, blowing holes in the core. I was just thinking a hose fitting that goes into a tube to slide in the hose. Water from the hose shouldnt hurt the heater core should it? Also, which hose do I need to hook the hose to for a back flush?
#5
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 14 Likes
on
14 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Your '91 may have one of those heater core water flow control valves which could be an issue. Any how, our '98 doesn't have that valve so I just disconnected the 5/8" heater hose at the water pump and the 3/4" heater hose at the t-stat housing, stuck the garden hose attachment into the 5/8" hose, stuck the 3/4" hose in a catch bucket and turned on the faucet. Works good and doesn't flush crud from the core into the head/block or rad.
#6
CF Veteran
Thread Starter
Join Date: Oct 2009
Location: Fauquier County, Virginia
Posts: 2,867
Likes: 0
Received 15 Likes
on
13 Posts
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Your '91 may have one of those heater core water flow control valves which could be an issue. Any how, our '98 doesn't have that valve so I just disconnected the 5/8" heater hose at the water pump and the 3/4" heater hose at the t-stat housing, stuck the garden hose attachment into the 5/8" hose, stuck the 3/4" hose in a catch bucket and turned on the faucet. Works good and doesn't flush crud from the core into the head/block or rad.
#7
CF Veteran
Thread Starter
Join Date: Oct 2009
Location: Fauquier County, Virginia
Posts: 2,867
Likes: 0
Received 15 Likes
on
13 Posts
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Also, where did you get that little attatchment? I really want one. Lol, CherokeeForum is like a bunch of kids that get together and have toys that every other kid sees and wants. Gotta love it.
Trending Topics
#8
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 14 Likes
on
14 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
I would think most hardware stores, maybe even an auto parts store has the garden hose attachment. Maybe just temporarily bypass the valve with some 5/8" and 3/4" heater hose to do the core flush. Can't get enough toys, right?
Thread
Thread Starter
Forum
Replies
Last Post
cpnwrench
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
13
02-15-2024 08:09 AM
jmsummers2012
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
53
04-30-2021 02:35 PM
tleed
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
3
10-04-2015 01:20 PM
bradleyheathhays
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
6
10-03-2015 09:51 PM
Silentj
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
10-02-2015 01:24 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)