Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > Broken Heater?

Join Wrangler Forum Today

Thread: Broken Heater? Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
12-11-2008 12:56 PM
ccain More than likely it's the heater control valve (if your Jeep still has one). They are usually vacuum controlled and, you know as well as I do, YJ's are notorious for vacuum problems. The extreme hot and cold makes the plastic vacuum lines brittle and they break real easy. And sometimes the diaphragm inside the HCV goes bad.

You may also want to check your thermostat.

Good luck.
12-11-2008 12:38 PM
tn-yj I would have to lean towards the heater core. Do you flush your radiator regularly? Im not well versed in this but that would be my bet
12-11-2008 10:24 AM
Broken Heater?

My 1994 Wrangler just started to blow cool/cold air out of the vents this morning. I had the heater on and she was fully warm when I switched it on. Could this be that the heater core just needs to be cleaned or could it be something more serious?

Posting Rules
You may post new threads
You may 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

All times are GMT -5. The time now is 09:49 AM.

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