No heat, heater core issue?
#1
Junior Member
Thread Starter
Join Date: Apr 2015
Location: Vancouver, BC
Posts: 37
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0
No heat, heater core issue?
I know this has been covered a million times, I've read the threads, but still am stuck on my understanding of the problem.
I have had no heat for a while and it's starting to get cold now. I flushed and back flushed the heater core and it did not solve anything. When the heat is off, both heater core hoses are similar in temp, with the heat on the lower hose is cooler, this means that there is flow through through the heater core correct? t-stat is working as it should. I'm guessing an issue with the blend doors? The problem with this is I do not understand blend doors what so ever...
I'm looking for trouble shooting ideas before I rip the dash out and replace the heater core
Thanks in advance
I have had no heat for a while and it's starting to get cold now. I flushed and back flushed the heater core and it did not solve anything. When the heat is off, both heater core hoses are similar in temp, with the heat on the lower hose is cooler, this means that there is flow through through the heater core correct? t-stat is working as it should. I'm guessing an issue with the blend doors? The problem with this is I do not understand blend doors what so ever...
I'm looking for trouble shooting ideas before I rip the dash out and replace the heater core
Thanks in advance
#2
Senior Member
Join Date: May 2010
Location: MI 48642
Posts: 882
Likes: 0
Received 1 Like
on
1 Post
Year: 1996
Model: Cherokee
Engine: 4.0
I would lean towards the blend door or the blend door actuator. The door is only held in place by plastic so one of the pivot points can break. It is more common for the actuator to be the problem, some have luck taking it apart and cleaning and greasing the gears.
#3
Banned
Join Date: Oct 2016
Posts: 1,553
Likes: 0
Received 4 Likes
on
4 Posts
Year: 2000 and 1998
Model: Cherokee
Engine: 4.0
I know this has been covered a million times, I've read the threads, but still am stuck on my understanding of the problem.
I have had no heat for a while and it's starting to get cold now. I flushed and back flushed the heater core and it did not solve anything. When the heat is off, both heater core hoses are similar in temp, with the heat on the lower hose is cooler, this means that there is flow through through the heater core correct? t-stat is working as it should. I'm guessing an issue with the blend doors? The problem with this is I do not understand blend doors what so ever...
I'm looking for trouble shooting ideas before I rip the dash out and replace the heater core
Thanks in advance
I have had no heat for a while and it's starting to get cold now. I flushed and back flushed the heater core and it did not solve anything. When the heat is off, both heater core hoses are similar in temp, with the heat on the lower hose is cooler, this means that there is flow through through the heater core correct? t-stat is working as it should. I'm guessing an issue with the blend doors? The problem with this is I do not understand blend doors what so ever...
I'm looking for trouble shooting ideas before I rip the dash out and replace the heater core
Thanks in advance
in 40 deg weather i need to drive 3 miles to get temp up and get heat in my 2000.
it sounds like your core is ok if temp changes in the hoses huh? heat is not getting out anywhere??
Last edited by nujeepguy; 11-23-2016 at 07:52 PM.
#5
Junior Member
Thread Starter
Join Date: Apr 2015
Location: Vancouver, BC
Posts: 37
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0
in my 98 the temp control cable was loose under the dash and it would not push the lever. if i helped it the door could be moved and i got a little more heat. you can see it on mine.move the control and see if anything moves. i flushed mine 2 ways,didnt help much. 08 has cables,not motors?
in 40 deg weather i need to drive 3 miles to get temp up and get heat in my 2000.
it sounds like your core is ok if temp changes in the hoses huh? heat is not getting out anywhere??
in 40 deg weather i need to drive 3 miles to get temp up and get heat in my 2000.
it sounds like your core is ok if temp changes in the hoses huh? heat is not getting out anywhere??
Trending Topics
#10
CF Veteran
Join Date: Jun 2011
Location: Louisville,KY
Posts: 8,014
Likes: 0
Received 14 Likes
on
14 Posts
Model: Cherokee
A blend door is just that a door that moves left to right.What it really does it change from heat to ac,When you switch the heat or ac on it moves to let that air move.Sometimes they break or not work and can be stuck in the ac position even tho you have it set to heat.And with it blocking the heat side you get no heat.Most of the time when the heater core goes it it will leak antifreeze in the passenger floor board or blow steam out the top of the dash.
#11
Junior Member
Thread Starter
Join Date: Apr 2015
Location: Vancouver, BC
Posts: 37
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0
A blend door is just that a door that moves left to right.What it really does it change from heat to ac,When you switch the heat or ac on it moves to let that air move.Sometimes they break or not work and can be stuck in the ac position even tho you have it set to heat.And with it blocking the heat side you get no heat.Most of the time when the heater core goes it it will leak antifreeze in the passenger floor board or blow steam out the top of the dash.