Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Steve1077]

My heater only seems to work if I use eco mode, other than that it just blows cold air

[Mike Collins]

I'm in the process of changing the matrix at the moment, I'll let you know the results.

[Gaffers]

I think that lack of heat in the cabin with evidence of a working water pump and flow through the system (no overheating) would point almost certainly to the matrix.

Good luck  

[Gaffers]

My heater only seems to work if I use eco mode, other than that it just blows cold air

Do you have the auto climate control?

[Mike Collins]

Progress so far on my matrix change, the new core has minimal resistance to blowing into it. The old one, when finally removed, has considerable resistance. High hopes.

Bad thing is the new one has slightly smaller end cans, so would spill air from each end. After much time wasting with foam strips, I've used mastic to seal the ends.

Reassembly is nearly complete, tomorrow should see if it's done the trick.

I never want to this job again! Going to the pub now.

[shanjon]

fixed it at last  [smiley=2vrolijk_08.gif] [smiley=2vrolijk_08.gif] [smiley=2vrolijk_08.gif] [smiley=2vrolijk_08.gif] i tried flushing matrix again and all seemed good until i ran it and it was cold
 i came up with the idea of removing top matrix pipe and stuffing hose into it so water could go around entire system and come out of matrix which it did slowlybut came out of reservoir very fast , i then put the cap on and loads of brown c**p came out followed by loads of water i repeated with the other matrix pipe and touch wood i have had loads of heat since and the car is running between 92.5 degrees and 95 degrees and is much lower than it was

[shanjon]

it was strange as i had backflushed the matrix several times, and before you all say it i have put anti freeze in.... just under 5 litres of the stuff, i was concerned about getting air in system so i unscrewed the screw in rad so water escaped slowly while topping up reservoir at the same time i then ran engine up to temp and let it cool then put the rest in using the same process

[106rallye]

glad you got it sorted buddy. i only read the 1st n last page so dont know if anyone has suggested it but have you thought of a previous owner using radwell or something similar? its nasty stuff and from what if heard, it could definetly block a matrix.

[shanjon]

its entirely possible m8 , the car really was not maintained at all and previous keeper did not have a clue and sold it cheap as it would not start in the damp which was complete rubbish, as it dont start as an when it wants lol

[paulkebab]

OK guys Ive got an MV6 with a cool heater too.. Ive pinned it to the matrix and heres how I did it. Take the vac pipe off the HBV and 'borrow' a nearby vac pipe, fix to the HBV. Now gently suck and blow on the other end of that pipe and you should feel the valve pulsing (ie opening and closing), it prevents water going to the matrix when you suck and vice versa. You can also check your air con while doing this, set to MIN and the pipe you have removed from the valve should now have vac present. If for some reason the heater now goes hot it would point to a sticky HRV - unfortunately mine didnt so its the matrix. I might try some radflush as the coolant wasn't in top condition and as someone commented, it may have been radwelded yuk. I dont think airlocks are a problem these days on modern cars unless you have air getting in (popped head gasket) or water pump is very tired, then you would get a hot engine too. Hope this helps!

[Mike Collins]

When I investigated the old matrix off the car, I found black plastic flakes in it. They look like the plastic used on the HBV or radiator stubs.

Blowing it through with compressed air cleared quite  a lot more contamination and did not hurt the core. I probably would have tried that in situ had I known the matrix could withstand it.

I used about 90psi air, but with the other stub open so as not to apply full pressure to the core.