What No Heat.............

[moonsta]

  theheater on my '88 8 valve is all cold,have checked the pipes into the bulkhead and the inlet is nice and hot but the outlet  is stone cold after the valve. do the valves go pete tong?? the car doesn't overheat and the system appears  to be quite fine with no water loss. don't particularly want to do a heater matrix if i don't have to!!!! any idea's??

[golfvr6]

try changing the bypass valve.

[moonsta]

  i was rumaging in the garage the other day and found a spare inlet bypass valve (the silver one) but don't know if i've got the black outlet one.are they available from GSF/Europart??  

[golfvr6]

Not sure mate, not that expensive from vw anyway.

[moonsta]

  yeh that sound like a good route to go down first.i did forget to say that i did disconnect the water hoses in and out of the heater and tried to flush it through and must admit that next to nothing came out of the outlet from the heater. will let you know how i get on. thanks  

[Ciaran]

good but obvios thing to check is your water level

[moonsta]

  thanks for the advice,but i think my inteligence level does run a little higher than checking how much waters in it ..................!!!!!  

[emlynw]

Hi, have you tried putting a water hose on the inlet, wait till the water comes from the outlet & quickly attach hose.
Re-attach inlet pipe & top up expansion bottle, warm the engine & feel the inlet & outlet pipes.
I had this problem on my girlfriends Golf & it seemed to do the trick.
Hope this helps.

[Gambit]

first off id check for air locks
take the cap of the expansion bottle, set the heaters to max heat, then let the engine idle till it starts to boil over - this will get rid of any airlocks you may have

if it still dont give off heat then i would look at the bypass valves

[Colin]

open your expansion bottle and check inside where  the small hose that connects to the expansion bottle, then run the engine up and check that you get water pumping out when it warms up.
Mine was blocked with rust and i couldn't bleed the air out of the system for love nor money (swearing at it didn't work either).
If that's ok then it's your bypass valve.