We've had ongoing heat issues in the blue 2000 Cherokee since day one. The heat has always sucked.
I found out last month that the blend door was actually screwed up, so i fixed that yesterday. Still no love.
Here's what i'm working with:
1) A perfectly clear and non-leaking heater core. Flushes 100% clear.
2) A working hvac panel
3) A working blend door motor
4) A freely moving blend door
5) A new radiator
6) A new thermostat verified to be working properly
7) All new coolant/heater hoses
Truck warms up quickly as it should, maintains operating temperature perfectly.
Heat sucks balls. Still. I have no idea what else to do at this point. Blend door is definitely working because now, as opposed to earlier, i can switch from cold to lukewarm.
Really frustrating because the heat in the 98 Cherokee i'm pretty sure is generated by a herd of dragons inhabiting my dash, and SWMBO wants that.
is there any way to to a core flow test?
dumb question but does the blower motor even work?
also see if no leaves or anything are built up in the motor inlet/oulet.
Autolex wrote:
is there any way to to a core flow test?
I don't know. I've hooked a hose up to it and it seemed to be flowing pretty damn well. It was replaced a year before we bought it.
fidelity101 wrote:
dumb question but does the blower motor even work?
also see if no leaves or anything are built up in the motor inlet/oulet.
Blower is working well. I don't have a problem with airflow. I have a problem with air temperature.
is there a coolant valve that stops/starts the flow of coolant from the engine to the heater core? I'd start looking to see if the heater core is getting any HOT water.
rcutclif wrote:
is there a coolant valve that stops/starts the flow of coolant from the engine to the heater core? I'd start looking to see if the heater core is getting any HOT water.
Nope. Full circulation 100% of the time.
rutclif had my suggestion.
Can you see the blend door moving when you ask it to?
Sometimes the cable just moves but the actual door doesnt.
And no air in the systems correct?
Do you get heat when you bring the RPM up to say 2,500 or are you just checking at idle?
A) you're absolutely sure the heater core gets coolant all the time and there is no vacuum operated valve?
B) you're absolutely sure there is no way there is air in the coolant system?
That's all I got.
In reply to moparman76_69:
I may be wrong but I thought only the earlier ones had that vacuum control.
ebonyandivory wrote:
Can you see the blend door moving when you ask it to?
Sometimes the cable just moves but the actual door doesnt.
And no air in the systems correct?
Do you get heat when you bring the RPM up to say 2,500 or are you just checking at idle?
I don't have cables for my HVAC, blend door is moving.
I ran it for a good 40 minutes yesterday. Idling and driving. SWMBO drove it for about 20 minutes as well. It's been on the road for 30 minutes today and still sucks.
No air in the system that i'm aware of. Engine temp is rock steady.
In reply to moparman76_69:
Absolutely sure this jeep gets core flow 100% of the time.
Dumb question, what is the actual temp reading? With the dampened gauges in most cars, they seem to reach the middle of the zone before they truly warm up. I'd want to verify you're getting good operating temps.
Do both hoses in the engine bay going to the heater core feel hot?
dj06482 wrote:
Dumb question, what is the actual temp reading? With the dampened gauges in most cars, they seem to reach the middle of the zone before they truly warm up. I'd want to verify you're getting good operating temps.
It sits between 200-210F on the gauge no matter how long it's been running. It's a "real" gauge, not a 2/3stage "idiot gauge."
PseudoSport wrote:
Do both hoses in the engine bay going to the heater core feel hot?
To the touch, yes. I might see about borrowing an IR temp thingymabobber and see what i see.
But the core is flowing quite well.
Fresh air door stuck open? Having to warm cold air from outside instead of recirculating?
Heater hoses. I hate when those things leaked. The PO of my Cutlass had all of them replaced because of that reason.
bigdaddylee82 wrote:
Fresh air door stuck open? Having to warm cold air from outside instead of recirculating?
The only time a late XJ recirculates is when "Max A/C" is selected. It pulls from outside air at all other times.
G_Body_Man wrote:
Heater hoses. I hate when those things leaked. The PO of my Cutlass had all of them replaced because of that reason.
They're new and not leaking.
if both hoses are hot with the blower cranked, I'd guess you have some blend door issue somewhere and it's not getting full airflow over the core.
IS the radiator clear and the coolant in good shape?
Has the coolant system been flushed recently?
Kenny_McCormic wrote:
if both hoses are hot with the blower cranked, I'd guess you have some blend door issue somewhere and it's not getting full airflow over the core.
Or your ducting is broken (or gone or not seated correctly) and air is flowing around the core rather than through it.
Swank Force One wrote:
bigdaddylee82 wrote:
Fresh air door stuck open? Having to warm cold air from outside instead of recirculating?
The only time a late XJ recirculates is when "Max A/C" is selected. It pulls from outside air at all other times.
Have you tried it in this configuration?
