Why is the ventiation system blowing HOT air only?

eberg

Well-known member
Joined
Oct 16, 2013
Location
Coquitlam, BC, Canada
TDI
2005 Jetta TDI, Manual - 2000 Golf TDI, Manual
Hoping that someone here can clue me in on what is happening with my Golf.

Driving along the other day I suddenly noticed that the cabin was getting very warm - it was set to blow cold, and I had already been underway for about an hour when it happened.

Turning on the AC does nothing, it just keeps blowing very hot air.

Coolant level is normal, temp gauge is at normal level and engine also appears to be at normal temperature when checking under the hood.

Any ideas :confused:
 

BobnOH

not-a-mechanic
Joined
May 29, 2004
Location
central Ohio
TDI
New Beetle 2003 manual
Telling us which car may help down the road. Do a little more digging. It could be the air mix door broke or the AC system isn't happy.
Interweb guessing you'll get right to the AC, it's a whole family of components.
DanG144 has put together a nice troubleshooting guide at-
Check your radiator/condenser fan operation NOW
 

eberg

Well-known member
Joined
Oct 16, 2013
Location
Coquitlam, BC, Canada
TDI
2005 Jetta TDI, Manual - 2000 Golf TDI, Manual
Telling us which car may help down the road. Do a little more digging. It could be the air mix door broke or the AC system isn't happy.
Interweb guessing you'll get right to the AC, it's a whole family of components.
DanG144 has put together a nice troubleshooting guide at-
Check your radiator/condenser fan operation NOW
It is a year 2000, Golf TDI. :)
 

KrashDH

Top Post Dawg
Joined
Dec 22, 2013
Location
Washington
TDI
2002 Golf
That thread/sticky is everything you could hope for troubleshooting your A/C issues. I used it for my car when I had problems.
 

Vince Waldon

Top Post Dawg
Joined
Apr 25, 2009
Location
Edmonton AB Canada
TDI
2001 ALH Jetta, 2003 ALH Wagon, 2005 BEW Wagon
... but since it's blowing hot air (rather than a lack of cold air) the most likely suspect is a blend door issue... most likely, the foam on the blend door has deteriorated over the years and is now letting hot air from the heater core into the cabin even with the "Heat" knob turned to Cold. :)

"Blend door" as a search term should bring up a whack of threads on what's happened and your options to fix it.

If in fact the issue is hot air, rather than "no cold air from my A/C". :)
 

BobnOH

not-a-mechanic
Joined
May 29, 2004
Location
central Ohio
TDI
New Beetle 2003 manual
And when Dan's around (he travels) he's real good about answer every little repeat question. Guessing some skip over it because the title says "fans". It's pretty complete, especially for the core years/models.
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis, MO
TDI
There are just too many to list....
Check the cable and the pivot point at the bottom of the HVAC case were the temp cable attaches.

When the foam goes, you get no heat. That is clearly NOT your problem.
 

eberg

Well-known member
Joined
Oct 16, 2013
Location
Coquitlam, BC, Canada
TDI
2005 Jetta TDI, Manual - 2000 Golf TDI, Manual
Check the cable and the pivot point at the bottom of the HVAC case were the temp cable attaches.
When the foam goes, you get no heat. That is clearly NOT your problem.

You are right, it was the pivot. Easy fix. Thank you!
 

Genesis

Top Post Dawg
Joined
Feb 26, 2003
Location
Sevier County TN
TDI
'03 Jetta Wagon
If that pivot fell out of the airbox it'll do it again; it's worn out and won't stay in place. CoolAirVW (here) has a nice replacement part for that which will fix it at a reasonable price (VW has disco'd the OEM one -- how nice of them!)
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis, MO
TDI
There are just too many to list....
It is included with the new HVAC case, which I find these need more often than the little pivot alone breaks. Which I have NEVER seen.. but was alerted to it from Richard telling me about the piece he has, which is the only way I was able to guess as to the solution to the OP's problem.
 

CStone

Veteran Member
Joined
Apr 12, 2006
Location
East TN
TDI
2003 Jetta ALH 5sp.
Resurrecting an old thread, but I've had similar issues in the past that have reared their ugly head this week.

'03 Jetta TDI. The pivot has fallen out of my airbox 2-3 times over the years, and I've learned that it's an easy fix. Stand on my head, reach in through the driver's side and pop that sucker back in.

Earlier this week it popped out again, evidenced by a HOT commute home on Monday. (It's cool in the mornings here still so it's not noticeable on way to work.) When I got home, sure enough, it was out and I put it back.

Tuesday, cabin was hot again on the way home. Checked pivot and it was in place. Hmm.

Same thing yesterday. Hot on the way home. I checked the pivot again and it was in place. I popped it out, moved the dial back and forth while holding the pivot to see if by chance it wasn't clocked correctly. Best I can tell, it is keyed to only fit one way. Popped it back in and went on with my evening.

Well this morning I had NO HEAT. No matter what I did with the dial, it was freezing in my car.

Question is this: Can the pivot be inserted incorrectly?
 

Tdijarhead

Top Post Dawg
Joined
Nov 10, 2013
Location
Lawrenceville PA
TDI
2003 TDI Jetta Daughters Car, 2001 TDI Beetle, Wife’s car, 2005 Golf TDI Mine, all 5 spds
If the pivot is not pushed in all the way, or with as many times as you have popped it back in the thin aluminum tab that fits into the pivot could be bent and so it’s not moving the door any more.

If your pin keeps popping out the small plastic taps on the side of the pin that keep it in place have broken off. Get one of coolairvw’s or find one on eBay and with an inspection mirror check on the tab it should be sticking well down into the sleeve the pin fits in. It may just have gotten pushed up into the air box in which case you might be able to move it back in place with your finger or a small short screwdriver.

If the tab has been bent I was able to straighten my daughters with a pair of 90* long reach pliers.
 

rangeroad

Veteran Member
Joined
Dec 10, 2013
Location
Halifax
TDI
2005 GLS Jetta Wagon (5-speed) Malone 1.5 w/ EGR delete
Can someone post photos of this pivot pin, or is there another thread that I can’t seem to find?
 

Tdijarhead

Top Post Dawg
Joined
Nov 10, 2013
Location
Lawrenceville PA
TDI
2003 TDI Jetta Daughters Car, 2001 TDI Beetle, Wife’s car, 2005 Golf TDI Mine, all 5 spds

PakProtector

Veteran Member
Joined
Jan 5, 2014
Location
AnnArbor, MI
TDI
Mk.4's and the Cummins
First, it is a real( insert favourite expletive ) to get the knob to engage the tab of the blend door. I put a piece of foam under mine, and a sheet of circuit board over top to keep the door actuator pushed back in. Once I got engagement between the tab and the knob-with-cable-arm.

Douglas
 

mudduck

Well-known member
Joined
Jan 17, 2013
Location
California
TDI
2003 Jetta, F250
I got mine realigned and pushed in. Then used a piece of 1/2 inch pvc pipe cut to the correct length jammed between it and the floorboard so it cant pop back out.
 

rangeroad

Veteran Member
Joined
Dec 10, 2013
Location
Halifax
TDI
2005 GLS Jetta Wagon (5-speed) Malone 1.5 w/ EGR delete
Is there a how to thread on this fix? I can’t seem to locate and quite sure this is my issue
 
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