Cold heater

2006 e220 cdi heater blows cold when on auto or high speed

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Gary Dodson

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E220 cdi 2007 2.1
My heater blows hot on low speed but cold on high speed or auto??
 

LostKiwi

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'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
Does the engine get to a proper temperature?
 
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Gary Dodson

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E220 cdi 2007 2.1
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Does the engine get to a proper temperature?
Yes it gets to the correct temp. Also the heater does blow hot but only when heater fan is slow.
 
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Gary Dodson

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E220 cdi 2007 2.1
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as above , need more info on this one pal
The car does get to the correct driving temp. I’ve replaced the heater Moyer as The old one squeaks and I changed the heater regulator.
 

LostKiwi

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'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
Did it work properly before you changed those parts?
 
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Gary Dodson

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Did it work properly before you changed those parts?
It didn’t work properly before I changed the heater regulator. I think the problem started in November when I replaced the water pump
 

LostKiwi

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'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
Ok sounds like you have restricted water flow. If the heat goes slowly from hot to cold this is another indicator.
You could have an air lock in the heater matrix, a kinked pipe, a partially blocked matrix or failing duovalves (if yours has them).
Start with the cheap easy things first - try reverse flushing the heater matrix and bleeding the air out of the heater matrix. The way I bleed the heater is to get some temperature (pressure) into the cooling system, then loosen the connection to the heater matrix where it comes out the firewall (usually duovalve if fitted) then very carefully slide a thin screwdriver down between the hose and the pipe to allow the air to bleed out. Be very careful as you are dealing with hot water under pressure!!!
Most cars don't require bleeding but for some reason I've had a few that do.
 

Frontstep

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T210 320cdi
Have you got pipes back in right place ?
 
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Gary Dodson

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Ok sounds like you have restricted water flow. If the heat goes slowly from hot to cold this is another indicator.
You could have an air lock in the heater matrix, a kinked pipe, a partially blocked matrix or failing duovalves (if yours has them).
Start with the cheap easy things first - try reverse flushing the heater matrix and bleeding the air out of the heater matrix. The way I bleed the heater is to get some temperature (pressure) into the cooling system, then loosen the connection to the heater matrix where it comes out the firewall (usually duovalve if fitted) then very carefully slide a thin screwdriver down between the hose and the pipe to allow the air to bleed out. Be very careful as you are dealing with hot water under pressure!!!
Most cars don't require bleeding but for some reason I've had a few that do.
Thank you I’ll get my garage to do that as I don’t want to make it worse
 


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