No hot air

Geoff130 · 16th May 2017, 22:25

I've noticed that the heat available in the car is a lot less than it used to be. According to my Intravee the coolant temperature is usually around 90C. Looking at older threads this seems to be a blocked heater matrix, is there a recommended way to flush it out?

Car is a 1.8.

MarkS · 17th May 2017, 06:40

Get an OBAC. They can generate a lot of hot air in quick time !

T-Cut · 17th May 2017, 14:06

Assuming there's no air in the cooling system (which often ends up in the heater matrix), then a reverse flush may improve things. My advice is not to attempt splitting the metal hoses hear the heater, but to split the in/out hoses at the firewall. I believe they're marked 'in' ond 'out'. With the hose ends free, apply domestic hosepipe pressure to the 'out' hose and see if you can remove any debris. The system must be bled correctly afterwards.

TC

Geoff130 · 19th May 2017, 20:37

Turned out to be air in the heater matrix. I flushed it through but there was nothing but a good flow of clean water. I'd taken the hoses off at the engine and clamped them after flushing to make bleeding easier. Nice and hot now ready for summer!

16th May 2017, 22:25	#1
Geoff130 Loves to post MG ZT 190, Rover 75 CDTi, Honda VFR 750, Honda CB550F Join Date: Aug 2010 Location: Derby Posts: 393 Thanks: 75 Thanked 36 Times in 28 Posts	No hot air I've noticed that the heat available in the car is a lot less than it used to be. According to my Intravee the coolant temperature is usually around 90C. Looking at older threads this seems to be a blocked heater matrix, is there a recommended way to flush it out? Car is a 1.8.

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17th May 2017, 06:40	#2
MarkS Gets stuck in Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011 Location: Bournemouth Posts: 664 Thanks: 189 Thanked 157 Times in 108 Posts	Get an OBAC. They can generate a lot of hot air in quick time !

17th May 2017, 14:06	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,751 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Assuming there's no air in the cooling system (which often ends up in the heater matrix), then a reverse flush may improve things. My advice is not to attempt splitting the metal hoses hear the heater, but to split the in/out hoses at the firewall. I believe they're marked 'in' ond 'out'. With the hose ends free, apply domestic hosepipe pressure to the 'out' hose and see if you can remove any debris. The system must be bled correctly afterwards. TC

19th May 2017, 20:37	#4
Geoff130 Loves to post MG ZT 190, Rover 75 CDTi, Honda VFR 750, Honda CB550F Join Date: Aug 2010 Location: Derby Posts: 393 Thanks: 75 Thanked 36 Times in 28 Posts	Turned out to be air in the heater matrix. I flushed it through but there was nothing but a good flow of clean water. I'd taken the hoses off at the engine and clamped them after flushing to make bleeding easier. Nice and hot now ready for summer!