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not much heat
by
jettabrendan
on 13 Oct, 2009 10:29
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My mk2 has no heat, both heater hoses get hotl so I'm assuming the heater core isn't plugged. Blower works great, but the air is barely warm. Sorry for vague info but its all I got.
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#1
by
rabbitman
on 13 Oct, 2009 13:25
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I'm not an mk2 expert but I've heard the "doors" inside the heater box can leak and mix hot and cold air, do a search there's been lot's of talk about it.
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#2
by
maxfax
on 13 Oct, 2009 17:45
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Rabbit man has got it.. THe blend doors are essentually a piece of sheet metal that look like swiss cheese.. Then they are coated with foam rubber.. The foam rubber turns to dust and the swiss cheese doesn;t divert air so well.. An easy fix is to remove the lower duct work and reach up in there and cover the thing with duct tape.. Although the duct tape doesn;t last so long.. I opted to glue pieces of plastic to the door (sides cut out of an antifreeze jug no less).. Works dandy....
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#3
by
jtanguay
on 14 Oct, 2009 09:59
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i'll third the blend door problem. after my heater core blew the anti freeze turned the foam into dust. if you want something a little more permanent and long lasting, use the aluminum tape used for duct work. i myself have used foam i bought at the dollar store and some 3M spray adhesive, but we'll see how long she lasts!
check out
my thread in the FAQi would also recommend flushing out your cooling system as that really helped me out! (much much more heat!)
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#4
by
JBG3
on 02 Nov, 2012 07:30
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I have pics to relate to this issue, I just got into this extensively-
Heater doors foamless and swiss cheesy-
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#5
by
TylerDurden
on 02 Nov, 2012 10:32
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+1 on the metal duct tape.
Putting the tape on is a PITA, but much easier than pulling the airbox. It helps if you have dainty hands.
The door in the back is the hot/cold control.
You may have noticed dark flecks of debris coming out of your vents - that's the old foam. I'm not sure how much gets stuck in the core, but I bet it's significant.
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#6
by
srgtlord
on 02 Nov, 2012 12:05
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I used lots and lots of duct , regular duct tape 4 years ago....
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#7
by
ToddA1
on 03 Nov, 2012 22:09
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#8
by
TylerDurden
on 04 Nov, 2012 11:41
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#9
by
ToddA1
on 04 Nov, 2012 13:22
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The core is before the foam, so the foam blows out the vents.
-Todd
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#10
by
wdkingery
on 07 Nov, 2012 20:06
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Shut up Yall mean I could have considerably more heat!? 1985 I bet I got a case of the cheeses too!
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#11
by
quanstrom
on 07 Nov, 2012 20:42
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I have an '85 which I bought without noticing the inlet and outlet water hoses to the core "teed" together. It was a cold ride home that night...
I pulled everything apart and used sort of a duct tape method to restrict all air through the holes last year. The car is capable of cooking a pot roast in the back seat if the blower switch is on "4" now.
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#12
by
TylerDurden
on 02 Jan, 2013 18:43
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I had a blinding flash of the obvious today...
My 89NA Jetta was taking a long time to warm up and get heat to the cabin. (I've done the tape on the airbox doors and flushed the core.)
But, while running a can of cleaner through the IP, I realized the radiator fan was running because I had the selector in the Defrost position. The AC has not worked since I bought the car, so I took the condenser out last year when I loaned the car to my pal in Miami, to let as much air flow to the radiator as possible. Well the rest of the AC stuff is still there, including the wiring that energizes the fan when the selector is in any AC position, including defrost. (Strangely, the AC relay normally on the fusebox is missing.)
My solution was to undo a connector in the engine-bay (no need to get into the dash mess). The double connector by the battery has R/W and G wires. Disconnecting that retains the thermostatic switch function for the fan. In the summer, the connector can be re-connected to allow forcing the fan on for extra cooling.
My other 1.6s have piping hot air from the vents: ~150F, this car only about 110F. Oh well, I doubt I'll replace the core... I don't plan on keeping this car after the winter passes.
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#13
by
damac
on 02 Jan, 2013 18:50
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I had to do the heater core on my 85 last week, getting dangerous to drive without one and cold
Mine was just like the pics, no foam on doors, worn out bits on vent flappers.
I decided to take the route of taking the dash out and thats the way I would do it in the future even though I have seen people mention doing it with it installed. This way I could easily move things around and refresh all those doors.
I don't have ac on my jetta, but it was rather easy to get to all bolts with a small ratchet/socket setup.
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#14
by
tyb525
on 02 Jan, 2013 19:21
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So if my vents are open with the fan on and cold air blows out of them even when I'm stopped, and hot air blows out of the dash vents, is this because I'm missing the foam?