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[shanjon]

i think there is a problem with flow myself but where is the question ?, i dont think it is the water pump because i broke down the other week when a hose burst and when the aa filled it with water the pump made a right racket until the water got to it, so in my mind that is turning as it should, the cars temperature is it taken from the rad or somewhere on the block, ?

[Marks DTM Calib]

Its taken from the back of the block for the gauge and the ECU values, its actualy on the coolant bridge which also has a feed to the bypass valve.

[Mike Collins]

I'm going through the same difficulties at the moment, I am reasonably certain I have poor floe through the matrix
So far I have flushed the heater core, plenty of flow. I have tried filling from the heater pipe as recommended, installed secondary coolant pump as in later cars and tried filling from the drain point on the radiator.

Changed the thermostat over this weekend and clipped a temperature probe to the heater return pipe. Initially return temperature around 35 C.
Fiddled about removing air from the heater lines and increased return temperature to around 60 C.
I still think I have an air lock, next step is to drill a small hole in one of the pipe stubs that will be covered by the hose in normal operation and bleed from there.
After three V6's, this is the first one that will not give good cabin heat and fill easily.
If I get it right before the weather improves I will let you know what I think fixed it.

[shanjon]

thanks for that , my reason for asking is because the car says it is really hot but i have never seen the fan on the rad come on, and as such im thinking the temp in rad is different to block becuase even if i switch the air con fans on it makes no difference to temp guage whereas it did on my 3.0 sintra and my veccy i used to own,

[Albus Dumbledore]

I would think that if one of the heater hoses was warm and the other cold, that the heater might me clogged. I thought the hot coolant went in through one og the heater hoses and out the other? On my car both gets hot.

If you think you have flow issues, you could also try to elevate the front of the car (sometimes to 45 degrees)
That will help the coolant start flowing, if your coolant system is not blocked.

By the way, has there been any reason for the system to clog up? Oil in water and such??

[jonathanh]

Its taken from the back of the block for the gauge and the ECU values, its actualy on the coolant bridge which also has a feed to the bypass valve.

As the matrix is clear that's where my thinking was going.  Disconnect the vac feed to make sure that the HBV is not diverting and go from there.  Sorry but I'm no expert in tracing the HBV pipework and I'll defer to others with better knowledge than me

[shanjon]

I would think that if one of the heater hoses was warm and the other cold, that the heater might me clogged. I thought the hot coolant went in through one og the heater hoses and out the other? On my car both gets hot.

If you think you have flow issues, you could also try to elevate the front of the car (sometimes to 45 degrees)
That will help the coolant start flowing, if your coolant system is not blocked.

By the way, has there been any reason for the system to clog up? Oil in water and such??

[/highlight]
not as far as i know m8 , im so peed off with this issue i will try anything so i will try raising the car as anything is worth a go

[shanjon]

Its taken from the back of the block for the gauge and the ECU values, its actualy on the coolant bridge which also has a feed to the bypass valve.

As the matrix is clear that's where my thinking was going.  Disconnect the vac feed to make sure that the HBV is not diverting and go from there.  Sorry but I'm no expert in tracing the HBV pipework and I'll defer to others with better knowledge than me

thanks anyway m8 all help greatly appreciated

[shanjon]

thanks for that , my reason for asking is because the car says it is really hot but i have never seen the fan on the rad come on, and as such im thinking the temp in rad is different to block becuase even if i switch the air con fans on it makes no difference to temp guage whereas it did on my 3.0 sintra and my veccy i used to own,

does anyone reckon my thermostat is stuck closed or only partly open (clutching at straws here)

[Mike Collins]

I would have thought a stuck thermostat is unlikely, if it opens too early the temperature will indicate really low. If it fails shut, which I think they are designed not to do, wouldn't it overheat?

Running temperature should be at halfscale and reasonably constant.

Changing my thermostat this weekend did not help my lack of heat. All it achieved was to show a small leakage at the front oil cooler joint. If coolant seeps out, could air be drawn back in overnight causing airlock problems?

Clutching at ever thinner straws now.

[shanjon]

if i cant fix it this week then its going to the car heaven im that peed off with it no wonder it was for sale cheap

[denisaok]

Hi i had a problem with my heater matrix after leak from oil cooler flushed matrix out it seemed ok water running though fine but could not get cabin hot .Took dash out an changed matrix car got so hot like new .old matrix was partly blocked

[Mike Collins]

That's interesting, so you ran water through the matrix and it seemed to flow well?

Could you feel any resistance blowing through the old matrix?

[denisaok]

no even used an system flush i did try most of above post to . iam a heating enginer an no heating wasnt funny . the pathways in the matrix block and the water just bypasses the blockage . cabin got hot when car was at idle but as soon as it was runnuig it got could. not saying thats wots wrong with yours but might be.

[Mike Collins]

Right, tonight's update.

I fitted a transparent section of pipe into the feed to the heater matrix in the hope of observing flow, in this pipe I added a copper section incorporating a bleed valve.

With the engine and the auxiliary pimp running, some turbulent flow was observed. Plenty of gas bubbles but no obvious air lock.

What I think was more significant was that the clear pipe, softened when hot, was swelling with the internal pressure. Even with the engine off and just the auxiliary pump running.

My worst nightmare seems to have come true, I have ordered a matrix.

So much for running a hose through the core and getting plenty of flow!