Heater Broke ????

[workhorse '90 8v]

Heater broken. It still blows, but only luke warm.  Any ideas?  Only thing checked so far is the fuse, which is fine.   I did have the dash/trim/etc off the other day to change the speedo cable, could i have knocked/broken something in the process..?
Any help much appreciated, frosty this mornin, brrrrrrrrr!!

[dubslug]

remove or change the water by pass valves in the engine, worked for me

[m4nesh]

my heater only gives out luke warm air too?

Flushed radiator, - no joy

Might try that by pass valve thing? Check other post for part number?

[workhorse '90 8v]

where's that VR6 bloke ?  he knows his stuff ..

[Veedubgt18v]

maybe your heater matrix has gone up the spout?

[jedi16v]

i had the same problem . the bloke who had my car before me fitted a new heater matrix but still only cold air . thanxs to this forum found out about the bypass valve's fitted new ones from volkswagon and they worked a treat . they cost about ?28.00 inc VAT which is'nt bad for volkswagon . lots of lovely heat . real toasty . oh and they only take about 10 mins. to fit bargain!!!!!

[golfvr6]

Changing the by-pass valve does seem to cure the problem in most cases.

[modulater]

At 28bar be silly not to give it a go