Coolant loss while driving? - Nissan Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 Old Feb 18th, 2013, 07:38 PM Thread Starter
Nissan Enthusiast
 
Joined: Feb 2013
Location: Colorado Springs
Posts: 70
Coolant loss while driving?

My 88 pickup with the Z24i engine appears to be losing coolant, but what's weird is it only seems to happen when I'm driving. I noticed the leak because I kept finding the coolant overflow tank empty when I just refilled it maybe a week earlier, the radiator is sometimes low on fluid, and I can see droplets of coolant on the bottom of the front frame ready to drop off when I'm under the truck doing other service work. I'm thinking maybe it's the water pump but I can't say for sure...I saw the mention of the hole in the water pump that indicates failure in my Haynes manual, but it was not clear whether or not the hole was on the top or the bottom. I think I can see a hole on the top, but I'm not 100% sure as it's pretty dirty in there, and either way I didn't see real evidence of coolant coming out of that hole because of all the other dirt and oil there. Is this a reasonable assumption? I'm pretty positive all the hoses are OK as they're new, but I'm really not sure how the coolant is getting down to the frame like that in the first place. I took the skid plate off to see if I could see more "traces" of coolant but so far nothing that I can discern. I don't see any runs on the hoses either, so I'm a bit confused. And the overflow tank is solid as well.

Any thoughts?
dbsoundman is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old Feb 18th, 2013, 08:57 PM
Sup Mod keeping the peace
 
rogoman's Avatar
 
Joined: Dec 2004
Location: NJ (Philadelphia area)
Posts: 4,186
On the water pump it's the bottom weep hole that you need to examine. First clean the area at the bottom weep hole. Start the engine and let it fully warm up which will build up the coolant pressure; now while the engine is idling, observe the area at the weep hole for any coolant leak.

Since you mentioned droplets of coolant on the front frame, the radiator may have a leak. After the engine has fully warmed up, shut it off and feel all around the radiator, top and bottom, for any trace of coolant; look at the radiator fins for wetness.

Worse case may be a blown head gasket.

KA-T for life, yo!
rogoman is offline  
post #3 of 10 Old Feb 18th, 2013, 09:17 PM Thread Starter
Nissan Enthusiast
 
Joined: Feb 2013
Location: Colorado Springs
Posts: 70
Don't say head gasket, I refuse to believe that! (actually I had considered it but there isn't much of any smoke from the tailpipe and no funny smells so I doubt that, though I do lose some oil as well...)

I'll check around the radiator next time it's warm, maybe get some UV dye too.
dbsoundman is offline  
post #4 of 10 Old Feb 18th, 2013, 09:28 PM
Nissan Enthusiast
 
wilburk's Avatar
 
Joined: Dec 2012
Location: Seattle
Posts: 237
Boy, your new pick-up sure has a lot of little projects!
wilburk is offline  
post #5 of 10 Old Feb 18th, 2013, 09:40 PM Thread Starter
Nissan Enthusiast
 
Joined: Feb 2013
Location: Colorado Springs
Posts: 70
Quote:
Originally Posted by wilburk View Post
Boy, your new pick-up sure has a lot of little projects!
Yeah, it wasn't driven for a while so several things are coming out of the woodwork...
dbsoundman is offline  
post #6 of 10 Old Feb 18th, 2013, 09:49 PM
Nissan Owner
 
Joined: Jun 2009
Location: Eastern Tennessee, USA
Posts: 485
In addition to what rogoman said, and just for future reference... I once had a customer's self diagnosed "blown head gasket" turn out to be a worn out radiator cap. Ironically, a worn out radiator cap that won't hold pressure or let the system draw coolant back into the radiator from the reservoir as the engine cools really can turn into a blown head gasket.

-R

1994 D21 2.4, 2wd, 5spd XE

Last edited by TheRepairMan; Feb 18th, 2013 at 09:53 PM.
TheRepairMan is offline  
post #7 of 10 Old Feb 18th, 2013, 09:58 PM Thread Starter
Nissan Enthusiast
 
Joined: Feb 2013
Location: Colorado Springs
Posts: 70
I did notice that coolant seems to collect on the cap, I took it off today when it was totally cold and the bottom of the cap was dripping with coolant. Might go get a new one soon...
dbsoundman is offline  
post #8 of 10 Old Feb 18th, 2013, 10:24 PM
Nissan Owner
 
Joined: Jun 2009
Location: Eastern Tennessee, USA
Posts: 485
Quote:
Originally Posted by dbsoundman View Post
I did notice that coolant seems to collect on the cap, I took it off today when it was totally cold and the bottom of the cap was dripping with coolant. Might go get a new one soon...
Well, you know what Bill Engvall use to say... "Here's your sign!"

-R

1994 D21 2.4, 2wd, 5spd XE
TheRepairMan is offline  
post #9 of 10 Old Feb 25th, 2013, 11:50 AM Thread Starter
Nissan Enthusiast
 
Joined: Feb 2013
Location: Colorado Springs
Posts: 70
Replaced the cap, I think I'm good now! I didn't even notice the cracks in the upper seal on the old cap before...
dbsoundman is offline  
post #10 of 10 Old Feb 25th, 2013, 01:03 PM
Nissan Owner
 
Joined: Jun 2009
Location: Eastern Tennessee, USA
Posts: 485
Quote:
Originally Posted by dbsoundman View Post
Replaced the cap, I think I'm good now! I didn't even notice the cracks in the upper seal on the old cap before...
Good deal! I hope that does it for you, and thanks for coming back here and keeping us posted!

-Roger

1994 D21 2.4, 2wd, 5spd XE
TheRepairMan is offline  
Sponsored Links
Advertisement
 
Reply

  Nissan Forum > Truck & SUV > HB Truck

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Nissan 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 you desired username.
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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome