Faulty Heater
Hi Guys
Wishing everyone a HAPPY NEW YEAR
Ive got an issue with my heater, the blower works fine on all settings.My problem is it only blows cold, as you can imagine not the best this time of year. Am i right in thinking its the matrix and if so is it as big as a job as it looks
Cheers Maz
Check has enough water in it?
If you remove the carpet kick panel you can see hoses or put a hand on them to see if they are warm, it could be cable isn't connected? Access is tight.
If you do remove , take lots of photos, seats have to come out I expect it's a minor fault
If your heater knob setting has been set in the cold position all summer season then it may be the heater valve seals internally have bonded in the closed position cutting off hot water flow to the matrix.
Check the hose when hot at and before the valve if that part is hot and cold from the valve body onwards it is very likely the seals have bonded on. The valve is under the driver side centre consol. If posssible when the engine cools down, disconnect the inlet to the valve and space allowing blow some air into the valve to see if the seals blow off the internal lip. Connect and test.
If not leave the heater setting on the hot position for a few weeks to see if it unbonds otherwise it may mean full removal of valve and perervre or replace with a new one.
My best suggestion here is never fully set the heater knob in either the hot or cold position, in fact when you have bottomed out in either setting come back a bit so that the internal seals are never under full contact with the lip thus prventing such restrictions.
Happy New tear to you all
What does the auxiliary electric pump do on the water side? Does this effect heater circulation?
Also known as a duo-valve, it is merely there to assist for better water circulation in th coolant/heater system and avoid traped potential any air pockets.
Sorry guys the inportant bit 1993 W463 300gd