heat blows cold air need help - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-15-2010, 11:38 PM   #1
yjkid95's Avatar
Join Date: Jan 2010
Location: Great Lakes, Illinios.
Posts: 1,851
heat blows cold air need help

The heat in my 95 wrangler was blowing freezing cold air and would take 20 minutes to get a little warm and the temperature gauge was all over the place so i replaced the thermostat, i even put in a brand new radiator and all new hose and antifreeze before that but now the heat just blows luke warm its not like it was when i first bought the jeep. Does anyone know what this could be? could it be airbubbles and if so how do i take care of it?

yjkid95 is offline   Quote
Old 01-15-2010, 11:43 PM   #2

WF Supporting Member
N39-W120's Avatar
Join Date: Feb 2009
Location: South Eastern VA
Posts: 2,020
Send a message via AIM to N39-W120 Send a message via Skype™ to N39-W120
vacuum valve to the heater core / heater core clogged / vacuum hose

Daily Driver 2010 Ford Fusion
Weekend Toy: 2008 Rubicon...
Expensive Toy: 1983 Cadillac Coupe DeVille

It's not the size of the dog in the fight, but the size of the fight in the dog!
N39-W120 is offline   Quote
Old 01-15-2010, 11:43 PM   #3
uplifted's Avatar
Join Date: Aug 2009
Location: NY
Posts: 593
Could be a clogged heater core.... When the engine is at full temp, feel both heater hoses.. If one is hot and the other cold, your core is clogged...You can try doing a reverse flush on the core. Has about a 75 % success rate when i do it for customers..... Now if both hoses are hot, i would look into the inner doors on your heater box..... Good luck..
91 YJ, SBC V8, 5 speed, 8.8, 4" spring, SOA, 35" MT/R ............ Sadly I have sold my Jeep.
uplifted is offline   Quote
Old 01-15-2010, 11:45 PM   #4
yjkid95's Avatar
Join Date: Jan 2010
Location: Great Lakes, Illinios.
Posts: 1,851
Ok thanks for the tips
yjkid95 is offline   Quote
Old 01-16-2010, 05:27 PM   #5
95riogrande's Avatar
Join Date: Oct 2009
Location: Battle Creek, MI
Posts: 235
You could have air bubbles in the system if the guage is going up and down. It also could be a defective radiator cap not holding pressure. Did you change this with the new radiator? The coolant is always flowing through the heater core. Trying back flushing like uplifted said and make sure the heater control cables are functioning properly. If it isn't opening the door correctly you may not have full heat or it could be drawing in outside air instead.
95riogrande is offline   Quote
Old 01-16-2010, 05:30 PM   #6

WF Supporting Member
scott howard's Avatar
Join Date: Dec 2009
Location: wichita falls texas
Posts: 1,035
And just a heads up . If it is the heater core you DO NOT have to remove the dash.
Just 4 bolts from the engine bay side of the firewall .

A lot of jeepers have made the mistake of thinking the dash has to be removed.

scott howard is offline   Quote
Old 01-16-2010, 07:08 PM   #7
Join Date: Sep 2008
Posts: 2,207
is the mixer door closing?

NAVYCHIEF is offline   Quote
Old 01-31-2010, 01:18 PM   #8
Join Date: Jan 2010
Posts: 2
I also have the same problem... Please let me know how you fixed it. I flushed the core, new cap, new radiator, ....nothing... Thanks
skidoomzx is offline   Quote
Old 01-31-2010, 01:40 PM   #9

WF Supporting Member
copleydad's Avatar
Join Date: Jun 2009
Location: Woburn MA
Posts: 368
Just fixed mine this morning since it FINALLY warmed up to the mid 20's.

Old thermostat was stuck open, guess it's been that way for a couple weeks, since the LAST time it got to be a balmy 34 degrees. Now the dash gauge shows a cozy 200 to 210 degrees and the heat will blast you out.


1989 Wrangler "Islander" 4.2 6cyl 5 speed

copleydad is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cold Air From A/C Stops After 10 Min. fishinVA TJ Tech Forum 11 08-22-2015 01:46 PM
87 jeep wrangler heat issues. 94cummins YJ Tech Forum 9 12-30-2009 07:10 PM
Heat works, but I'm cold...... wingedone1 TJ Tech Forum 7 12-22-2009 05:23 PM
Cold 'nuff for ya? skeeter Off-Topic 12 12-08-2009 08:06 PM
Severe cold weather driving scotiez General Jeep Discussion 4 02-03-2008 06:36 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:55 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC