Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > Water pump bad?

Join Wrangler Forum Today


Thread: Water pump bad? Reply to Thread
Title:
  
Message:
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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)
12-05-2010 10:33 PM
yj-guy Replaced thermostat with a fail-safe thermostat and replaced water pump. Problem solved. Oil is clean, dodged a bullet this time. Thanks for all your help.
12-05-2010 09:02 PM
chensley Unscrew your radiator cap- if the water is not greenish/orangeish then your out of anti freeze...which acts as a lubricant for your water pump. Bad water pump=high temp.
12-05-2010 08:18 PM
scott howard No problem yj guy.
give me a call or pm if you need a fast answer on something.
12-05-2010 09:28 AM
markharmon I had a similar prob with a car. I was loosing fluid but couldn't find any leaks not even on the ground. Found blown head gasket was forcing fluid back into overflow bottle. When that filled up it was push out. The only way I found it was I noticed green drops on the bottle after I had wiped it off.
12-04-2010 09:33 PM
yj-guy Thank you Scott, I'll replace the water pump and thermostat tomorrow. I'll also check the dip stick for milky looking oil.

I appreciate your help and I'll post tomorrow about what I find when I check the oil.
12-04-2010 08:53 PM
scott howard no the weep hole does not vent air . it is there to tell you the pump is bad before it leaves you on the side of the road or trail from a totally useless pump.

pull the dip stick and make sure your oil is not milky from a blown head gasket and filling the crank case with water.

call me if you have more questions
12-04-2010 07:57 PM
yj-guy Also, I forgot to mention it's a 4.2L

I'll go ahead and replace the thermostat anyway though. That's not a bad recommendation and It's so simple to do.
12-04-2010 07:54 PM
yj-guy The thermostat is opening. I'm sure of this because when I topped the radiator off, I left the radiator cap off to watch the coolant level as I reved the engine. The coolant immediately sucked down about an inch and rose back up immediately when I let of the throttle. The heater is also working so I'm getting flow throught the core. There seems to be great circulation. The reason for my overheating was the loss of nearly a gallon of coolant at which point, the heater went cold and the engine temp began rising. So I guess I should clarify my original question. I'm losing coolant from some where fast but I can't locate the leak. I read in my haynes manual that coolant leaking from the "weep hole" on the bottom of the water pump means the seal is blown. What's got me confused is, I was trying to find the leak and I saw bubbles being blown from a hole above the shaft on the water pump (not below). I'm not sure that coolant was coming from this hole or if it was simply blowing bubbles in the coolant that had leaked onto it. Does anyone know if there is supposed to be airflow through the "vent hole" or is it a sure sign of the pump needing replaced?

Thanks again
12-04-2010 07:49 PM
sppfields Yep, bad water pump. X2 on change thermostat also.
12-04-2010 07:49 PM
scott howard sounds like the thermostat stuck close and overheated causing pressure to build up and blow the seal on the water pump.
the good news is a water pump is cheap and not to hard to replace.
when you buy a thermostat make sure you get a fail safe one and this will never happen again. they cost 5 dollars more than the cheap ones.
a fail safe will open if it goes bad instead of close when they go bad like the cheap one , best 5 bucks of insurance you can buy.
and blocking off half the rad. will not hurt, never block the whole thing.
12-04-2010 06:36 PM
60mg Is it a 2.5 or 4.0?
In any case, make sure it's not the thermostat before you go on the pump, although at this point it sounds like you need to change it too. Just my .02
12-04-2010 06:12 PM
yj-guy
Water pump bad?

I thought I'd be real smart and place cardboard in front of the radiator in my YJ in an effort to increase the temperature of the heater. It worked. too well. I was watching the temperature closely and had to remove the cardboard after driving for just 10 to 15 minutes. The temp gage was slightly above normal when I removed the cardboard but the temp continued to climb. I quickly got it home and shut it down before the needle reached the red. There were some gurgling noises from the boiling coolant and I shined my flashlight on the water pump. There is a small hole just above the shaft on the water pump which was blowing bubbles. There was coolant leaking from somewhere and everything was wet. I had lost about 3/4 gallon of coolant. I'm not sure where from but I suspect the water pump? In the case of overheating, is it normal for the "vent hole" on the water pump to spew anything or blow bubbles? Or does that mean my pump is bad for sure?

Thanks

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.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC