no heat-92 audi 80 SE
 

my father has a 92 audi 80 2litre SE and there is no heat coming from the inside heater.... he has just had the thermostat changed and the heater hose with the bleeder fitted.... there doesnt seem to be much of a flow coming from the engine into the heater matrix...and as far as i can tell it isnt airlocked... is it possible that the water gallerys are blocked up... the car doesnt over heat or anything when being driven... flippin freezin in this cold weather... any ideas....

Broken heater control cable or knob???

How high temp goes? "New" isn't always synonymous to "good".

Highly unlikely, dashboard vents flap is the one which has tendency to fail.

on my 100 the rotary knob pulls a steel cable, the plastic bit which attached the cable had broken.

Try finding the valve which directs hot water to the heater matrix (in the engine bay) and try opening and closing it by hand.

With such valve in B3/B4 is equipped only cars with climate control.

this hose is NLA... Iasked yesterday at my dealers because the 90 quattro has the same issues as you.

how hot are the hoses getting ? I had problems with the 20valve yesterday and think it had an air lock, i didn't use the bleed screw on the hose as it wouldn't move, so left rad cap off, heater on hot rev engine at about 3000rpm till the fan cut in this got rid of my air lock and the heater is hot today. If your hoses are hot (both) see if the flap that directs the heat over the matrix is working, you need to take the glove box or drivers shelf out to see it

You have a new stat. is the heater hot while not driving the car, then gets cold when driving ? if yes try blocking the lower half of the rad off with card, it could well be over cooling

It is more interesting to do this as driving a little bit, revving engine with full clock. Of course, on public roads it isn't legal... :D
This may be solution for VAZ [pardon, LADA] not Audi :finger: My A80 driving @ 60 mph in -15c still had coolant temperature of 80c - thanks to working termostat. Dunno about UK, here in latvia it isn't hard to buy termostat, which is crap.

hmm....so if you took the rad plug out and run at normal operating temp, with the heater on full,did you rev the engine at 3000 rev until the water in the radiator started to bubble out of the small brass bolt hole, then return bolt into hole and tighten?
then top up the expansion tank if necessary?

cheers:tup:

I changed the State. last week and when filling the system had the rad bleed screw out started the car and once water flowed from it refitted it . heater worked ok but stopped again, so yesterday i removed the rad cap topped the res. up to max and held at revs till the fan cut in, lots of bubbles came out and the heater worked again refitted the cap and that was it . been out today and still nice and warm

holy moly... lots of you havin heat problems then... ah the thermostat was replaced to see if that would cure the problem .. temp hand sits about half way on the gauge.... its not the control knob as it heats up slightly if left sitting... as i siad there isnt much flow actually coming from the engine and thats why im thinking the waterways are blocked some how.... he was told the head gasket could be to blame but im not sure about that...

how about the impeller on the water pump, it could have come loose and not be turning much ?

I changed the rad on my 92 2.0 audi 80 last week, had the same trouble lol
What you have to do is.... Remove the exp tank filler cap and get a bottle of water ready. Then as you're looking at the engine, pull off the left hand pipe that goes to the heater matrix, (slacken the clip first lol) then push it upto the plastic part you just removed it from but leave a tiny gap right at the top
Then top up with your water untill it starts coming out of said gap. Then push the pipe all the way on and tighten the clip back up. Worked on mine :)

how could you tell if you have a knackered water pump?



I removed the brass bolt when the engine was up to temp and got bubbles coming out, i had to top up the expansion tank by about half an inch, no difference to heating.... in fact my breath warms the car quicker!!

the fan eventually kicks in so assume the thermostat is fine?

also being -13* here I dont suppose this helps either!!

yeah ive already tried that used to work on my older audis all the time... but it still made no difference.... must try covering half the front of the rad and see if it helps....

you can only tell by taking it off, you would prob. get overheating / running hot in the summer, are both the pipes to the heater hot when the fan cuts in ? the should both be as hot as the top hose ie can't touch them for long if they are the problem may be a blocked matrix (the water is only going through part of it ) or the control flap that alters the heat setting may not be working

ill get a look at it again this weekend.... think im getting the car now cause he just bought an A4 TDI... so ill have more of a clue whats what... thanks for all the help by the way fellas...

lots of people with blocked cores around..

dirt kicks up sometimes..

this guy cane up with this!!

i think this mad method was on a U.S site..:confused:

if all else fails..... ha ha ... got ta love it...

had a quick look at the car yesterday... took both pipes off at the bulkhead where they go to the matrix.... no water flowing from either... the head must have a blockage... the car isnt overheating and the fan cuts in as it should... :hmmm:....
new head time maybe...

100 % sure its not the water pump??

sounds very odd...........:hmmm:

not sure now.... suppose its possible.... ill need to get dug into it..

got stuck in to the 80 today.... done the whole coolant flush malarkey.. no good...:shake: so disconnected some of the hoses... it seems to be the actual heater matrix afterall...:grr:. very poor flow through it... looks to be a big job from pics ive seen on here... are the matrix ssss sss eese seeseses, matrixes ,matri (whatever)... are replacements hard to get hold of...

new heater matrix arrived this week...... not looking forward to fitting it..... :yikes::yikes:

are ye only getting this wagon sorted now lad!!:lol::lol::lol::lol:, your worse than me!!

ha ha only getting the parts now.... be another couple of months to fit it....:lol::lol::lol:

definately like me then :lol::lol::tup:

I'd sack yer postman if he takes 8 months to deliver yer parts!

ah the postmans busy servicing housewives....:lol:

A little while back, I read about a guys who had a similar issue on his quattro.

Checked the cables, connections...

even went ahead and replaced the a/c & heater control or climate control.

that's what everyone else thought...even I!

He said he was able to resolve the issue by replacing the radiator cap. I did not bookmark the page so I could not give you his exact explanation. I wonder if that can help you.

yep, if the system won't pressurise it does not heat up properly, found that recently with a leaky rad. and a year ago with a leaking core plug.

but at the same time i have some image of a physics teacher or college lecturer telling us that coolant is prevented from boiling because its a sealed system(because of the pressure)...:shocked::lol: though my mind does consist mainly of jelly!

the 'engineers' will work it out in the morning i'm sure..:tup: good one! people do always overlook the obvious

rad cap would be an easy fix.... but im pretty sure its the heater matrix... have a new one here now so ill change it anyway.. theres a lot of scale in the hoses too... so probably blocked up the matrix..

started the task of fitting the heater matrix today... wasnt looking forward to it.. got stuck in and all went pretty much to plan... have the new one in place now ad the dash refited... get it all back together tomorrow.... old one was definatly restricting flow... took it out and connected it to the garden hose... gave it a couple of slaps and the mud started to flow out...so it been filed under bin... hopefully that will be the end of the heat issue... ;)

ahhhhhhh..... feel the heat..... lovely lovely heat..... :arf:

all back together and working first class.... so the answer to the question was a blocked heater matrix... :tup:

em, so apparently it wasnt the matrix!!!!! its not cured it after all, i had a nissan almera here yesterday doing the same thing, had it all apart too, water pump was working, thermostat was working, bad flow coming from the heater hoses, so im thinking head gasket is to blame on both cars,

the audi hasnt bee on the road for around 2 years now, its tucked up in the corner of the mancave, fired it up today for a giggle but still couldnt get it to warm up...

head gasket kit here but im thinking of a 7A conversion later so will see how it goes...