Heater blowing cold passenger side

operamagorum · 27th November 2020, 13:37

Hi all
As per title. The heater is blowing cold on the passenger side and hot on the driver's side.
Ideas please. --- Heater matrix? Air lock?
Radiator was changed about 9 months ago
Thanks
Geoff

grs6680 · 27th November 2020, 14:33

Quote:

Originally Posted by operamagorum

Hi all
As per title. The heater is blowing cold on the passenger side and hot on the driver's side.
Ideas please. --- Heater matrix? Air lock?
Radiator was changed about 9 months ago
Thanks
Geoff

Sounds like it needs a good flush not a hard job drop some wynns radiator flush drive round for a day then reverse flush the complete system then top up with fresh antifreeze should take 30 minutes to do.

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T-Cut · 27th November 2020, 16:54

The usual way to remove silt from the passenger side is to attach a mains hosepipe to the heater outlet hose at the firewall. With the inlet hose also disconnected, give the matrix a good blast. Typically, the blockage is limescale sediment that will be flushed out as a sludge. In more severe cases, an acid treatment with a kettle descaler might be needed but in severe cases, a new matrix is the obvious fix.

TC

27th November 2020, 13:37	#1
operamagorum Loves to post BMW 330i Touring Join Date: Jul 2015 Location: Blandford Forum Posts: 378 Thanks: 184 Thanked 159 Times in 89 Posts	Heater blowing cold passenger side Hi all As per title. The heater is blowing cold on the passenger side and hot on the driver's side. Ideas please. --- Heater matrix? Air lock? Radiator was changed about 9 months ago Thanks Geoff

27th November 2020, 16:54	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The usual way to remove silt from the passenger side is to attach a mains hosepipe to the heater outlet hose at the firewall. With the inlet hose also disconnected, give the matrix a good blast. Typically, the blockage is limescale sediment that will be flushed out as a sludge. In more severe cases, an acid treatment with a kettle descaler might be needed but in severe cases, a new matrix is the obvious fix. TC