Heater not heating - VW Forum :: Volkswagen Forum
MK3 Discussion area for the third generation Golf III and Jetta III produced from 1993 to 1999 including Cabrio models.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 01-27-2016, 12:03 PM Thread Starter
Member
Points: 4,276, Level: 41 Points: 4,276, Level: 41 Points: 4,276, Level: 41
Activity: 37% Activity: 37% Activity: 37%
 
Join Date: Jan 2012
Location: Raleigh, NC
Posts: 64
Heater not heating

OK, fun stuff heating systems in German cars....anywho, our '94 Golf has not had a very good heater ever really, and it slowly got less and less warm. However, the heater core started leaking and, after much prayer and wringing on the hands, we replaced it. When I had the box out, I vacuumed out all of the typical MK3 foam debris from everywhere I could. Upon the reinstall (no leaks: yay!) the heat wasn't making muster even though the engine side hoses clearly indicated heat transfer to the core.

Any ideas on why this is? If I have to pull the HVAC box again, I might not live through it: frustrating endeavor to say the least; I much rather rebuild the engine!

Thx!

Dave
clanofwolves is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 08-17-2016, 11:47 PM
Member
Points: 20, Level: 1 Points: 20, Level: 1 Points: 20, Level: 1
Activity: 87% Activity: 87% Activity: 87%
 
Join Date: Aug 2016
Posts: 7
My first guess would be the water pump. Has it ever been replaced? Is the engine overheating?
When the car is cold take the small hose off the top of the coolant bubble and point it into the top of the coolant bubble after taking the cap off.
Start the car and observe the little coolant line. Do you see coolant flowing out slowly? Hold it there for a while until the engine warms up; after warming up does the flow increase? How about if the car is revved up to 3k rpm; is the flow much heavier?
Kelp is offline  
post #3 of 4 (permalink) Old 10-18-2016, 12:43 PM
Member
Points: 35, Level: 1 Points: 35, Level: 1 Points: 35, Level: 1
Activity: 99% Activity: 99% Activity: 99%
 
Join Date: Oct 2016
Posts: 7
Did you replace and or fix the missing foam from the blender door? If not it is likely full of holes as you mentioned vacuuming out foam.
-:vw:- is offline  
 
post #4 of 4 (permalink) Old 12-14-2016, 02:52 AM
Posting Master
Points: 19,511, Level: 88 Points: 19,511, Level: 88 Points: 19,511, Level: 88
Activity: 99% Activity: 99% Activity: 99%
 
XxBORAxX's Avatar
 
Join Date: Jul 2010
Location: Boise Idaho
Posts: 1,632
also thermostat could be left open... depending if your motor is actually getting hot or not.

VW MKIV GTI
VW MKIV Jetta Low N' Slo
To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
DD
VW MKIV Jetta GLI Vrawrr6 Because Racecar sold
To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
XxBORAxX is offline  
Sponsored Links
Advertisement
 
Reply

  VW Forum :: Volkswagen Forum > Volkswagen Models > MK3

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the VW Forum :: Volkswagen 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:
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:
OR

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



Similar Threads
Thread Thread Starter Forum Replies Last Post
over heating? 2.0slow MK4 3 07-18-2012 10:45 PM
Over-heating Treadg3 New Member Introductions 2 07-18-2011 02:20 AM
Over Heating 411pit New Beetle 4 07-05-2010 04:02 PM
over heating jinnayfa MK4 1 03-08-2010 06:20 AM
help... over heating!! 1.8Tspeed! MK4 11 04-05-2009 07:25 PM

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 On
Pingbacks are On
Refbacks are On

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