vaccume canister
#49
Member
Joined: Dec 2008
Posts: 214
Likes: 0
From: Roseville, Ohio
Year: 1990
Model: Cherokee
Engine: 4.0
That is more than likely a heater core issue then. The heat side of things isnt vaccum controlled, its cable controled (atleast on my 90) If the heat isnt hot its usually signs of a clogged heater core.
#50
CF Veteran
Joined: Nov 2008
Posts: 1,735
Likes: 0
From: Metro Denver, CO
Year: 1987
Model: Cherokee
Engine: 4.0L
#51
CF Veteran
Joined: Nov 2008
Posts: 6,989
Likes: 4
From: Oak Harbor, WA.
Year: 1987
Model: Cherokee
Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
I found a great way to get more than enough heat out of my 91. **** a waterpump seal....LOL. That baby got hotter than hay-ell!! Seriously, if you're not getting any heat inside and you know your heater core is good. I'd say your heater control valve is bad or leaking or you have a thermostat that is stuck open.
#52
Member
Joined: Dec 2008
Posts: 214
Likes: 0
From: Roseville, Ohio
Year: 1990
Model: Cherokee
Engine: 4.0
heater cores are cheap.. probably $20 at the parts stores. Changing them requires removal of the entire dash.
My cherokee ran 230 degrees when I first got it. (it has the Renix style system in it)
I replaced all hoses, and did a coolant flush, it dropped my temps to 210. I replaced the thermostat and water pump and its HARD to hit 190 now. I had to put cardboard infront of my radiator to get it to heat up enough to keep more warm.
My cherokee ran 230 degrees when I first got it. (it has the Renix style system in it)
I replaced all hoses, and did a coolant flush, it dropped my temps to 210. I replaced the thermostat and water pump and its HARD to hit 190 now. I had to put cardboard infront of my radiator to get it to heat up enough to keep more warm.
#56
Member
Joined: Dec 2008
Posts: 214
Likes: 0
From: Roseville, Ohio
Year: 1990
Model: Cherokee
Engine: 4.0
Mine worked and squeeled from time to time so I repalced it. Motor wont effect the tempt just the speed. That was yoru squeal. Temp is either s temp switch malfunction or a heater core.
#57
CF Veteran
Joined: Jul 2008
Posts: 1,217
Likes: 7
From: Schnecksville, PA
Year: 94 XJ
Model: Cherokee
Engine: 4.0L
When you move the heat selector (COLD>>>>>>>>>>>>HOT)
Do you feel ANY resistence?
Both of my XJ's had the cable-end pop off at the flapper door.
Easy to fix, its right under dash on passenger's side.
A cheapo pal-nut and good as new.
Do you feel ANY resistence?
Both of my XJ's had the cable-end pop off at the flapper door.
Easy to fix, its right under dash on passenger's side.
A cheapo pal-nut and good as new.