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General Information => General => Topic started by: homerj1 on October 30, 2013, 02:39:06 am

Title: Mk1 Heater Core Replacement
Post by: homerj1 on October 30, 2013, 02:39:06 am
The sweet smell of antifreeze mist permeates the interior of mk1 Jetta   :'(

So, it is time to change the heater core. I've searched and found a few methods of removing the core.

Bottom line, what is the easiest way. I don't have ac & my I'm not as flexible as I used to be. ;)

thanks
Title: Re: Mk1 Heater Core Replacement
Post by: RabbitJockey on October 30, 2013, 04:29:21 am
i have been lucky and never had to replace one in the 3 mk1s i drove for 10 years.
Title: Re: Mk1 Heater Core Replacement
Post by: theman53 on October 30, 2013, 05:20:33 am
I have never replaced a non ac heater core, but I have done the ac heater cores in MK1. The ac heater cores there is NO easy way. I am very flexible, but even a contortionist midget would have trouble. The only way I think I would try it again is to remove the entire dash. Once the box is out it is fairly easy.

On second thought, if I had to do it again I would hire someone.
Title: Re: Mk1 Heater Core Replacement
Post by: RabbitJockey on October 30, 2013, 05:39:55 am
jetta dashes are pretty easy to remove, especially non ac, when i rewired my coupe i was surprised how easy and quick it went, its a bit of a mess but if u keep organized with the screws and all that its not too awful
Title: Re:
Post by: theman53 on October 30, 2013, 05:46:11 am
I have heard non ac mki are cake to replace the heater cores. Also, whenever I reply and say mk? Whatever generation I never think of any cars but the rabbit or jetta. I never think of the vanagon scirocco dasher. So my experience is with the rabbit and jetta. Fwiw
Title: Re: Mk1 Heater Core Replacement
Post by: CRSMP5 on October 30, 2013, 07:29:20 am
l under dash tray... it slides out by the throttle pedal... which tends to be in the way...
Title: Re: Mk1 Heater Core Replacement
Post by: homerj1 on October 30, 2013, 08:00:27 am
l under dash tray... it slides out by the throttle pedal... which tends to be in the way...

Tell me more!

Btw congrats on the tv singing performance!  :)
Title: Re: Mk1 Heater Core Replacement
Post by: CRSMP5 on October 30, 2013, 08:51:09 am
pull under tray dash.... plastic cover by throttle on heater box comes off.. heater core slides out towards pedals...

i remove box screws drop it down loose.. lide it out to miss pedals..

no its not fun.. but pulling the dash.. honestly.. more work then needed.. pull your drivers seat to lay in foot area better...


p.s. you know that thread is a joke right?? i refuse to be on tv till i goto retire...
Title: Re: Mk1 Heater Core Replacement
Post by: the caveman on October 30, 2013, 09:39:35 am
Yup as i remember the Mk 1 rabbit and jetta come out near driver pedal, foxes come out on the passenger's side. No need to remove dash. A bit of a pain, but not too bad
Title: Re:
Post by: theman53 on October 30, 2013, 09:44:29 am
I had a post about it several years ago with my gti. I remember saying in that post I would like to kick that German engineer square in the sack for this design. I hated it. I did pull the seats and bottom part of dash iirc. It still sucked. The fan never did work correctly after I was done.
Title: Re: Mk1 Heater Core Replacement
Post by: fatmobile on October 30, 2013, 11:12:37 am
I have never replaced a non ac heater core, but I have done the ac heater cores in MK1. The ac heater cores there is NO easy way. I am very flexible, but even a contortionist midget would have trouble. The only way I think I would try it again is to remove the entire dash. Once the box is out it is fairly easy.

On second thought, if I had to do it again I would hire someone.

 Off topic but the AC can be done easier than non-AC,.. if you cut a hole in the side of the box and slide the core out. Then install cover plate.
 Plenty of room. Sideways picture, ha.
 (http://img403.imageshack.us/img403/9361/heaterboxmodcorecoverkl9.jpg)

Non-AC is a pain because of the peddle cluster, room restriction.
Title: Re: Mk1 Heater Core Replacement
Post by: mystery3 on October 30, 2013, 11:52:36 pm
I have never replaced a non ac heater core, but I have done the ac heater cores in MK1. The ac heater cores there is NO easy way. I am very flexible, but even a contortionist midget would have trouble. The only way I think I would try it again is to remove the entire dash. Once the box is out it is fairly easy.

On second thought, if I had to do it again I would hire someone.

If you remove the screws on the side of the dash at the steering column and possibly a few more, lay in the passenger footwell, use your knee or one hand to lift the dash a couple inches you can squeeze the whole box out into the passenger footwell. It's highly tedious and somewhat painful but less work than pulling the whole dash indeed. I'd recommend paying someone as well if in a position to do so. I too have never done a non-a/c unit but I've done two on cars equipped with a/c.
Title: Re: Mk1 Heater Core Replacement
Post by: homerj1 on October 31, 2013, 02:18:19 am
Thanks for all the help, but according to the below, there are only 3 awards given out..  :) ( I guess real life isn't like kindergarten??)

Quote
Thread: Mk1 Heater Core Replacement
Thread Statistics:
Site:    vwdiesel.net - latest threads
Forum:    General
Total authors:    8 authors
Total thread posts:    11 posts
Analysis:    The sentiment of the discussion is negative. The discussion is quite engaging and quite controversial. The user theman53, was very engaged. It got traction. We find the discussion interesting and original.
Awards:    The following users won the first, second and third place as most active and engaging users:
First Place   1st Place:   theman53
Second Place   2nd Place:   RabbitJockey
Third Place   3rd Place:   8v-of-fury

This is from here........http://omgili.com/thread/jHIAmI4hxg8flTySTKqPK9zlPmcxpueao7X0hMlucBXvTTLLh6T3l0rD8bVnJ7.2duyVtBvX.uhoh9Onj4kHaA--/
Title: Re: Mk1 Heater Core Replacement
Post by: RabbitJockey on October 31, 2013, 04:52:56 am
that is so weird
Title: Re: Mk1 Heater Core Replacement
Post by: homerj1 on October 31, 2013, 12:39:23 pm
that is so weird

I thought the same?

I found these instructions and was hoping that they might work?

http://www.driversfound.com/scirocco/techtips/body/heatercore/

But based on other stuff that I've read, and everyone's  responses, it is going to be a long Saturday heater core  replacing session...

I knew I should I have bought a new Kia .....   ??? lol

Title: Re: Mk1 Heater Core Replacement
Post by: srgtlord on November 01, 2013, 04:30:43 am
Just cut a hole in the heater box and pull the darned thing out
Title: Re: Mk1 Heater Core Replacement
Post by: deepgrooves74 on November 01, 2013, 08:08:44 am
I am about to do my a/c box from my rabbit... Mine is currently sitting in my studio out of the car... Figured I won't have to replace anything in there for a while.
Title: Re: Mk1 Heater Core Replacement
Post by: homerj1 on November 02, 2013, 10:04:41 am
Hey I survived and now I have a new working heater core.

It really wasn't too bad of a job. Once the lower dash panels were off - it was basically, pull the heater hoses going into the firewall,  loosen the 4 bolts in the w.wiper tray,  turn the heater sideways and pull out the core - as suggested by a few of you

There was no need to pull the whole heater assembly out or even play with the dash (other then the above)

It took me really only 2- 2.5 hrs & that was working slowly.  Also discovered that a mk2 blower switch works in place of a mk1  switch - just need to use the mk1 knob to make the fan positions jive with the mk1 heater control template

Thanks for all your help and support.

ps My back survived well & was actually more sore trying to bend over the engine compartment and try to connect the cold start cable. ( that was my other goal today)
Title: Re: Mk1 Heater Core Replacement
Post by: CRSMP5 on November 02, 2013, 10:40:45 am
switch direct fit... except... no off.. but since you have a 3 speed fan use 4th as off..

in mk2 they added a off spot to the def lever.. and removed the off on the fan switch... just plug it in.. turn past 3 for off..
Title: Re: Mk1 Heater Core Replacement
Post by: homerj1 on November 02, 2013, 12:11:45 pm
I was also surprised,  at how exposed to the outside weather elements the electrics on the blower fan are   :o

Design flaw?

 Or just hope the rubberised coating on the resistor\capacitor thingamadealies keeps the weather out?    :)

 
Title: Re: Mk1 Heater Core Replacement
Post by: ORCoaster on November 02, 2013, 08:19:33 pm
I think the engineers did it that way on purpose.  To get the heat off the big resistor.  Mine doesn't seem all that worse for wear but I do have an intact rain tray.  Corrosion on the wires seems higher than normal as the hot and cold cycle on the heat may have something to do with that.

Just my ideas on their ideas.