Last post on Dec 05, 2013 at 7:03 AM
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Jeep Grand Cherokee, Jeep Cherokee, SUV
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#4650 of 5143 Re: NO HEAT 2004 JGC [jeepowner3]
Dec 30, 2009 (5:50 pm)
I have a 1999 Jeep Grand Cherokee Laredo and the heater just dosent produce any heat. The temperature of the motor is good but the heater just gets slightly warm. I am looking at replacing the heater core but need to know if that is going to fix the problem or if there are other problems I need to check first because the heater core is an expensive repair job. Any help is welcome.
#4651 of 5143 Re: NO HEAT 2004 JGC [rhall62]
Dec 30, 2009 (8:36 pm)
I presume you checked your thermostat. Also if you have air conditioning you may have a control valve that keeps hot water from entering the heater core. If so that may be closed. Hope that helps.
#4652 of 5143 Re: NO HEAT 2004 JGC [rhall62]
Dec 31, 2009 (9:00 am)
I looked at my 97 shop manual. The diagram shows the blower motor and A/C evaporator mounted in the same duct. Next it shows a "Temperature Blend/Air Door". If this door is open then then the air passes thru the heater core. If not, the heater core is disconnected from the duct.
Everything is electrically controlled.
Temp gauge should be up to normal within 5 minutes of leaving the driveway unless you are idling. If it is very slow then your thermostat is stuck open and it will take a long time to get warm air from the heater so for a short 15-20 min. trip you never get much heat. However, it eventually should warm up. Where I liive our coldest days are in the 20's and my jeep is parked outside.
I am not sure but I don't think there is any control valve to control circulation of engine coolant thru heater core. Check the Haynes manual. Find where the heater hoses go thru the firewall. Make sure they get warm.
I'd make sure warm up is normal (thermostat OK) and then look at how the duct is controlled. To do it yourself plan on some disassembly of the dash which I always find time consuming, but it can be done.
#4655 of 5143 Re: NO HEAT 2004 JGC [rhall62]
Jan 01, 2010 (8:23 pm)
spend a few bucks at a reputable repair shop,and have the cooling system power flushed..they can send coolant both ways through heater core,and probably clear any blockage..if core isn't leaking-(interior would smell of hot coolant,pass floor would be wet) then replace core..
-they will b able to tell u what's wrong..
-if engine temp gauge is hot,and temp knob is turned all the way in the red zone-you should have heat..you should have a gauge-and normal operatimg temp is around 200% f,..try that b 4 you dive into tearing dash apart..also,online repair manuals are online at advance auto and autozone..more detail than a haynes manual,just print out your findings-keeps you from getting greasy keyboard(lol)
#4656 of 5143 no start in park
Jan 02, 2010 (7:51 am)
2000 jeep cherokee 6 cyl 4.0 L in park key turns all dummy lights come on but nothing happens shift to neutral jiggle the key and it starts. could this be the neutral safety switch or the linkage out of adjustment and if so need some instructions to repair.
#4657 of 5143 Re: NO HEAT 2004 JGC [rhall62]
Jan 02, 2010 (4:05 pm)
When you change the settings dial to--- floor,-- face,-- both-- and defrost does the air flow change? You can feel the heater hoses in the engine compartment as they enter the firewall and if both are hot the heater core is getting flow thru it. I had similar problem but was able to come up with a fix.
Let me know if there is no airflow change as you dial the switch and I will tell you what I did.
#4658 of 5143 Re: no start in park [huffy21]
Jan 02, 2010 (5:24 pm)
yes..sounds like th safety switch to me. try putting it in park "harder".,and see if it helps,but the jiggleing part even in neutral sounds like it's gone out of adjustment,or going bad,and replacement time..
-advance auto-online has service manuals..look up the part,and after that,yhere's usually a "how to fix it"link..saved me a lot of greif.
#4659 of 5143 Re: 2000 Jeep Grand Cherokee Limited Quad AWD front end noise whine howl. [taffy3]
Jan 04, 2010 (11:55 am)
Hi I had the same problem, I took my front drive shaft out and my front end noise was gone but was told running it without the drive shaft in it would damage the transfer-case viscus coupler by a reputable a transmission shop, which doesn't make sense. so i replaced both right and left front axles since the boots were bad anyway but the noise and binding is still there. Id love to take the drive shaft out again if I knew for sure it wouldn't damage anything. By the way I drove the thing for a week with out it with out any problems but again the trans guy said its not a good idea so i put it back in. how long have you drove your jeep without the front drive shaft...Thanks