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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old September 19th, 2011, 07:37   #1
fenne
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Default 05 Passat heater doesn't work

So my wife and I bought a used 05 Passat TDI. We have had it a couple weeks and the weather is cooling off in the mornings enough to need the heater. But it doesn't work!!! Won't blow hot air. When you turn the dial from cold to hot you can hear something in the dash move. But it only blows a little warmer but it is still cold. So where do I go from here? Also the climate control lights don"t work when the headlights are on. Thanks for the help.
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Old September 19th, 2011, 14:23   #2
vwztips
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Most likely a clogged heater core. I have had some success by removing both lines of the heater core at the firewall and back flushing with water. Have seen some pretty nasty junk come out.

I find hot water seems to help break it loose better. I have a sink I can connect my garden hose to.

For the climate control light, go to the dealer and buy the bulb. Then set the fan switch on 3 and pull the fan knob out. I use a piece of vacuum hose to slide over the old bulb and replace it with the new bulb.
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Old September 19th, 2011, 15:46   #3
fenne
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Quote:
Originally Posted by vwztips View Post
Most likely a clogged heater core. I have had some success by removing both lines of the heater core at the firewall and back flushing with water. Have seen some pretty nasty junk come out.

I find hot water seems to help break it loose better. I have a sink I can connect my garden hose to.

For the climate control light, go to the dealer and buy the bulb. Then set the fan switch on 3 and pull the fan knob out. I use a piece of vacuum hose to slide over the old bulb and replace it with the new bulb.
I hope that it is a clogged heater core. I've read some other threads here that talk about the control box foam gasket going bad. I really don't want to tear the whole dash out. Sweet I was hoping its a bad bulb. Didn't know the knob had to be 3. Thanks a bunch.
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Old September 19th, 2011, 21:53   #4
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Note the operative words "some success". Not all will unclog to get the full heat back. Yes I have had to replace the heater core several times. I think the balance shaft is probably easier and I don't lose as much knuckle flesh either.

The noise you hear in the dash is probably air bubbles or restricted water flow through the core.
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Old September 20th, 2011, 06:57   #5
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I've read on other vw forums guys having luck flushing their heater core with clr. So its worth a try instead of doing the heater core replacement.
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Old September 20th, 2011, 11:29   #6
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Actually, I'm having this same problem I think. Do you hear kind of a pop when you switch from heat to cool or visa versa?

Mine was my air conditioning that wasn't working & I heard something in the dash move when I tried to switch. I took it to the repair shop & they said it was a little pin/spring located in the dash that was broken. $15 part.....$500 repair to get to it.

They went in a manually switched it from hot to cold. I can have one or the other. That was before summer & now that it's getting cold, I need my heater back. I was hoping to find a guide on how to repair it myself.
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Old September 20th, 2011, 11:54   #7
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Are you sure it's not the control panel that has broken a tab or gear. I have seen those break for various reasons. It's easy to inspect and replace espcially if you pull the radio out and the radio cage. IIRC the control unit is not that expensive. Main tool you need is a flat blade screwdriver to pop out the cover for the controls, a T20 torx for the controls and the radio removal keys if you want to take it out (recommended along with the cage which is held in with T20 torx as well)

As for the heater core you can place your hands on the inlet and outlet hoses to check for flow. They should both be close to the same temp as the upper radiator hose (really hot). I use a laser temp sensor to check mine. If either or both are significantly cooler then most likely you have a blockage.
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Old September 20th, 2011, 11:57   #8
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BTW, the Bentley manual is not very detailed about the removal of the dash but it does show where the key nuts and bolts are. The most annoying ones are under the dash for the support brackets.

You also have to discharge the A/C system to do this job.
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Old September 21st, 2011, 06:38   #9
fenne
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Quote:
Originally Posted by ericanjensen View Post
Actually, I'm having this same problem I think. Do you hear kind of a pop when you switch from heat to cool or visa versa?

Mine was my air conditioning that wasn't working & I heard something in the dash move when I tried to switch. I took it to the repair shop & they said it was a little pin/spring located in the dash that was broken. $15 part.....$500 repair to get to it.

They went in a manually switched it from hot to cold. I can have one or the other. That was before summer & now that it's getting cold, I need my heater back. I was hoping to find a guide on how to repair it myself.
No I don't hear any pop. A/C works great. $500 bucks?! Hopefully you can invest in some DIY tools and DIY!!
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Old September 21st, 2011, 06:41   #10
fenne
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So I flushed the heater core last nite with a little CLR. I let it sit for about 40 min. Bled the core out which seemed to take forever. But the heater felt like it was working better. I'll find out once my wife is home from working out.

vwztips, could you remove the heater core by pulling the radio out? Or is there not enough room?
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Old December 1st, 2013, 10:11   #11
jables
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Can someone post more detailing instructions on how to do the core flush with CLR? I have no heat and a gurgling sound...
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Old December 1st, 2013, 14:57   #12
jables
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Never mind, I figured it out... and I have heat now!

Dealer quoted me 1500 to replace the heater core. Crooks!
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Old December 3rd, 2013, 08:26   #13
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Quote:
Originally Posted by jables View Post
Never mind, I figured it out... and I have heat now!

Dealer quoted me 1500 to replace the heater core. Crooks!
Tell us what you found....
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Old December 4th, 2013, 06:17   #14
jables
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Well I put CLR through it using some clear vinyl hoses and a funnel. It really didnt seem clogged as gravity was enough to push the CLR through. I had it draining in a bucket and flakes of rust accumulated at the bottom.
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Old December 5th, 2013, 17:37   #15
auntulna
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One of the two I own did this

I tried my own core flush, but little difference

Paid a local AC shop, less than $100, they expelled lots of crud, showed me

Now makes lots of heat
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