Just picked up an XJ!
Thread Starter
Newbie
Joined: Dec 2016
Posts: 8
Likes: 0
From: Pittsburgh, PA
Year: 2000
Model: Cherokee
Engine: 4L I6
That tidbit about the AC may have just answered the question, I have seen someone take the AC compressor and reroute the heater into it so it has heat. Not good heat but heat, it will also cause it to not feel cold, that and the substance you got out of the heater core may be radiator sealant, which is not good as it can gum up the cooling and heating system.
Seasoned Member
Joined: Dec 2016
Posts: 307
Likes: 0
From: Cranston, Rhode Island/Swansea, Massachusetts
Year: 1999/1995
Model: Cherokee (XJ)
Engine: 4.0L
Certainly, what I mean is possibly someone got sick of having no heat for whatever reason, and decided to run the heat into the AC system instead of the usual separate lines and made it into another heat source. I've only heard of it once but it was quite clever
CF Veteran
Joined: Oct 2013
Posts: 2,097
Likes: 12
From: Tarpon Springs, FL / Denver, CO
Year: '98
Engine: 4.0 I6
Do you mean route the heater core hoses in to the A/C Evap core?? That sounds like a terrible idea 
OP
If you have good flow through the heater core, and both hoses are getting hot - either your blend door is not shutting all the way (allowing the air to "bypass" the heater core).
If you do replace the heater core or pulling the HVAC box to check for proper operation, take a look here;
https://www.cherokeeforum.com/f51/97...cement-219723/
OP
If you have good flow through the heater core, and both hoses are getting hot - either your blend door is not shutting all the way (allowing the air to "bypass" the heater core).
If you do replace the heater core or pulling the HVAC box to check for proper operation, take a look here;
https://www.cherokeeforum.com/f51/97...cement-219723/
Seasoned Member
Joined: Dec 2016
Posts: 307
Likes: 0
From: Cranston, Rhode Island/Swansea, Massachusetts
Year: 1999/1995
Model: Cherokee (XJ)
Engine: 4.0L
Do you mean route the heater core hoses in to the A/C Evap core?? That sounds like a terrible idea
OP
If you have good flow through the heater core, and both hoses are getting hot - either your blend door is not shutting all the way (allowing the air to "bypass" the heater core).
If you do replace the heater core or pulling the HVAC box to check for proper operation, take a look here;
https://www.cherokeeforum.com/f51/97...cement-219723/
OP
If you have good flow through the heater core, and both hoses are getting hot - either your blend door is not shutting all the way (allowing the air to "bypass" the heater core).
If you do replace the heater core or pulling the HVAC box to check for proper operation, take a look here;
https://www.cherokeeforum.com/f51/97...cement-219723/
Seasoned Member
Joined: Apr 2011
Posts: 263
Likes: 0
From: 4 Corners, USA
Year: 2000
Model: Cherokee
Engine: 4.0 I-6 Cyl. w/ 0630Head+MikeWilsonAdapter (preserves engine/brain function w/ stronger head) 62mmTB
Welcome. Nice vehicle. I had a remotely similar problem and it was the blower motor resistor. My AC went out around the same time, but I didn't realize it. Your situation may well be different.
On second thought, on another vehicle, just before the heater core went out it began blowing barely warm air. Caution, though. When those go they ruin lungs and interiors in some vehicles, with first a fine barely detectable coolant vapor, then a gush of it.
On second thought, on another vehicle, just before the heater core went out it began blowing barely warm air. Caution, though. When those go they ruin lungs and interiors in some vehicles, with first a fine barely detectable coolant vapor, then a gush of it.
Last edited by '00 XJ; Feb 2, 2017 at 07:58 PM.