new thermostat

easisatman · Post by **easisatman** » Tue 13 Dec, 2011 22:08

Hi All
Reading the threads here about heater not getting hot I changed the thermostat on the wifes 1997 1.9 z3. not a hard job,I just took the radiator cowling off 2X screws top cover 4x screws the fan blade off 4x bolts undid the 2 hoses from the thermostat and removed the thermostat 4 X bolts yes as said the 2 plastic lugs had broken off holding the metal thermostat in place, anyway put it all back together and now gets up to temp quickly but the heater still does not get hot.
The 2 hoses going to the heater are hot so the water is getting there also the heater valve works ok so I can only think its the heater matrix which has a blockage is this a common problem?

thanks
easisatman

gookah · Post by **gookah** » Wed 14 Dec, 2011 09:57

Could be the water pump, where the impellor is slipping on the shaft, and not providing enough flow through the normal resistance of the heater matrix.

si-forks · Post by **si-forks** » Wed 14 Dec, 2011 14:16

Hi could you tell me where you got the thermostat from and how much as i have the same problem with my 1.9 thanks

stu · Post by **stu** » Wed 14 Dec, 2011 16:14

Couldbe the system needs bleeding? First place I'd look if the heater was working OK before you changed the thermostat?

HTH

Stu

GSF is a good source of consumables, like a thermostat. BMW tend to do these at reasonable prices too.

easisatman · Post by **easisatman** » Wed 14 Dec, 2011 17:54

gookah wrote:Could be the water pump, where the impellor is slipping on the shaft, and not providing enough flow through the normal resistance of the heater matrix.

yes its a possible but the flow and return hoses to the heater matrix are very hot!! so i think the matrix must be partly blocked

easisatman · Post by **easisatman** » Wed 14 Dec, 2011 17:55

stu wrote:Couldbe the system needs bleeding? First place I'd look if the heater was working OK before you changed the thermostat?

HTH
no the heater was not working before thats why i changed the thermostat
cheers

Stu

GSF is a good source of consumables, like a thermostat. BMW tend to do these at reasonable prices too.

easisatman · Post by **easisatman** » Wed 14 Dec, 2011 17:58

si-forks wrote:Hi could you tell me where you got the thermostat from and how much as i have the same problem with my 1.9 thanks

yes a spares shop in Barcelona 60€ a oem part but without bmw written on it
regards

si-forks · Post by **si-forks** » Wed 14 Dec, 2011 19:54