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General Forums => The Mess Hall => Topic started by: mad mike on October 30, 2006, 03:44:11 AM

Title: no heat
Post by: mad mike on October 30, 2006, 03:44:11 AM

my heat and defrost was working just fine the other day and now i have nothing but cold air blowing out of my vents i dont know what could have happened all i know is that it is cold and i need help

Title: no heat
Post by: lanulos89 on October 30, 2006, 04:19:52 AM

heater core

Title: no heat
Post by: DemonicHuey on October 30, 2006, 04:45:55 AM

not to sound dumb but double check the fluid....and i would hav to agree with the heater core issue....

Title: no heat
Post by: YJmechanic on October 30, 2006, 05:21:49 AM

heater core is a good possibility but fluid can also do it very easily.  also make sure the mix for the fluid is even.  if you put in too much antifreeze it will not get hot enough plus damage your cooling system.  also your thermostat could be stuck open and not letting the engine fully heat up.  i have also seen water pump fins come apart and still cool the motor but not throw heat.  what year? motor? trans?  previous repairs?  not heat alll the time or just at idle?  does it get warmer when you are in the throttle?  what does the gauge read?  let me know the specifics and I'll try to help you.

Title: no heat
Post by: Jesse-James on October 30, 2006, 05:31:29 AM

I've had a T-stat do that to me in 3 different vehicles. If it's not getting up to temp that's probably it. Need more details though like YJ said.

Title: no heat
Post by: lanulos89 on October 30, 2006, 02:04:48 PM

yea um posted heater core this morn before running off to school, so thats pretty much all the time i had to write.  but it seems that our other members never seem to fail, at getting the other possibilities out there.check to see if the heater lines coming from the block are clogged, i kno it sounds odd, but i've seen it happen.

Title: no heat
Post by: mad mike on October 30, 2006, 07:32:29 PM

it is a 93 yj 2.5 with i belive is a ax-15 i am going down to check the fluid and the mix i will let you know the results i bought the jeep from my brother and when he first got it i put a new t-stat in upper rad hose and 2 new heater core lines

Title: no heat
Post by: larhan on October 30, 2006, 09:34:16 PM

Just fixed mine....it was a fuse

Title: Re: no heat
Post by: gharger on December 10, 2006, 06:37:50 PM

Quote from: "mad mike"

my heat and defrost was working just fine the other day and now i have nothing but cold air blowing out of my vents i dont know what could have happened all i know is that it is cold and i need help

Check your cable connection that controls the heater core compartment flapper. It's the one that will move when you slide the heat bar over.

Title: no heat
Post by: Tall Boy on December 10, 2006, 10:08:32 PM

If the thermostat is stuck open the motor  will  take a long time to heat up, like maybe an hour. If the temp guage reads cool even after 15 -20 minutes the thermostat is bad. Mine takes about five minutes to read on the guage. Heater cores usually leak coolant, maybe.

Title: no heat
Post by: Chad on December 13, 2006, 12:45:43 PM

when my heater core blew up the other day, it was worth than cold air coming out the defrost it was a terrible anti-freeze vapor that quickly coated my windshield making it impossible to see out of, I hope its not ur heater core because they are cost about 250 for the part and according to the book 7.9 hours to replace more than that if you have AC

Title: no heat
Post by: Tall Boy on December 13, 2006, 12:48:49 PM

Ahh, but a mechanics bread and butter :D .

Title: no heat
Post by: mad mike on December 14, 2006, 02:08:35 PM

just buy the after market one that sits under the dash

Title: no heat
Post by: YJmechanic on December 15, 2006, 06:56:35 AM

you find me a michanic that enjoys heatercores and i'd be surprised.  we have them all the time in the wj's and they are murder getting out and the time from the book is hard to reach.  don't always assume you are getting ripped off sometimes  the mechanic is especially if he's flat rate.

Title: no heat
Post by: mad mike on December 15, 2006, 02:06:51 PM

i hate replacing heater cores in anything in my 85 blazer it was kinda easy compared to most but still a pain in the ass