I have managed to get some drawings on the heating system and it seems that only one fan and 4 servos and it looks like it could be a servo fault which means I will have remove the dash
Ongoing Cabin Heat Issues Matrix
- Thread starter Compo1
- Start date
Hi there - Did cleaning the egr fix the issue for you? thanksIt's going to remain a mystery this one then.
Annoying
I flushed the egr cooler and the water side of the egr the flow was in my opinion was good, at various stages trying to solve my issues i thought i was sorted, at one point id great even heat from the all vents. Sorted i thought. I thought id cured it with the blocked pump and obviously that helped a lot but was not the total fix, although my cabin was red hot.
After that at the next regen it lost another header tank full of coolant, i was pulling pipes all over looking for restrictions or blockages yet again after doing them once before, i removed the pipes at bulk head to the head and egr cooler for a better look. The top pipe has a smaller, thin pipe on the same coupling. This is the return to header tank pipe from the matrix, it has a one way valve in it and i think this is responsible for returning for any overpressure in the matrix, this return valve on mine flowed both ways not one way which was to allow flow to the header tank from the matrix and not back. My thoughts are as the systems pressure rose higher during a regen the pressure was flowing back towards the matrix through the faulty valve causing all sorts of issues localized boiling etc.
I replaced that pipe system and touch wood i can say with confidence it has cured it.
Although every time i put that in print it does it again.
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Interesting feedback - these cooling systems are soo complicated, with many one way valves, pumps and heat exchangers!
When I had my blocked matrix, I also noticed my tank pressure relief cap was weak and letting go at something like half or two thirds of its marked value. Easy to test by blocking off ports on the tank and pressurising it with a bike pump and gauge.
I also think for me a key thing is the length of time it is taking for cabin to heat up - cabin takes a long time to heat which makes me think there are more blockages
After cleaning out the crystal salt like stuff from the auxiliary heater pump and the low heat circuit pipework i could get warm air starting to come through within a couple of miles. At cold the main coolant circuit is cut off by the main water pumps shroud been closed, at that point the auxiliary heater pump is working by pumping exhaust heated coolant from the egr cooler on diesels anyway through the matrix.
I feel your pain mate, ive had it rough sorting mine as there were various problems that were not just down to a blocked heater matrix. I've learned stuff along the way.
I'm very surprised my hair line is how its always been, ive lost sleep over this issue but im too stubborn to be beat, think most would have shipped it off to webuyanycar
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