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Having just driven for 2 hours through freezing fog with the hood down...that's another story I appreciated how ineffective the heater was / is.

Essentially I don't have any heat at all, was OK'ish  last year.

Suggestions where to start appreciated.

Thanks

Phil

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Hi Phil,

is your heater valve on the head fully open - the original type is quite useless and can be closed when you don;t knowit.

You may have an airlock in the heater matrix remove both hoses (in the engine bay) and connect to garden hose and give it a blasting.

When reconnecting ensure you do not put the air bubble back in.

I assume you do have air flowing through the heater matrix to your feet.

 

Roger

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Hi Rog,

Heater value is in the fully open position.

No hot air to my feet ( difficult to tell with hood down and a blanket over my legs ) but coming through the side dash vents.

Fan working OK.

I will try the garden hose tomorrow, if that doesn't work should i replace the heater valve ...what type is best.

Phil

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If your car is a CP, make sure you have the flap open to allow the airflow, it seems a little counterintuitive but it does work with the heater.

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Hi Phil

The heater valve is located at the back of the cylinder head easy to remove check once engine warm if the hose gets hot first obviously with control inside on warm I would also check the distribution control cable do this by operating whilst looking at the flap on bottom of heater unit in the car from either the drivers or passenger foot well sounds like it will be the valve on the head as other say its not a good design 

Chris

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1 hour ago, Phil H 4 said:

Having just driven for 2 hours through freezing fog with the hood down...that's another story I appreciated how ineffective the heater was / is.

Essentially I don't have any heat at all, was OK'ish  last year.

Suggestions where to start appreciated.

Thanks

Phil

What about keeping all tools stored and just touch the hoses under the dashboard with your hands for a first test?

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Marco’s advice is spot on to get a decent diagnosis.... feel the hoses to/from the heater valve and the heater box. You should feel an increase/decrease in the temp of the hoses when altering the valve position (assuming it isn’t blocked so badly that it hardly alters)

As mentioned, be sure to have the outside air scuttle-flap open otherwise the matrix won’t be getting any airflow.

if you get to the point of flushing the matrix and hoses with a garden hose be careful not to crank the pressure up too high - you could damage the matrix.

....... Andy 

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  • 1 month later...

So back to the heater....

Looks to be the valve although it looks pretty new.

Reading another thread which highlights valve issues other members have had it steered me in the right direction.

Thanks Guys..

At the risk of repetition !

I have ordered Four seasons Everco 74648 through Rock Auto part £22.59 plus FedEx and VAT £39.39 ( plus duty tbc)

Cheers Phil

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Starting on the cooling system today, despite a backwash being part of the service carried out by a TR specialist 3 years ago, findings were not good.:(

The heater valve as you can see was totally blocked despite looking reasonably new.

Having flushed the system every which way with cold water I'm now at the stage of adding the Speed flush.

The recommendations are having added the cleaner and topped up the water, fast idle for 10 minutes, drain, flush and refill with antifreeze / water mix.

Would it be preferable to leave the cleaner in for a day or so, start up again to give a good stir and then drain or would this be detrimental.

I have presently removed the thermostat and have silicone hoses.

Direction on the best procedure appreciated.

Thanks

Phil

IMG_6033.jpg

IMG_6034.jpg

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When i looked into flushing out the cooling system on my 6 i found that Holts offered a two part cleaning product which seemed to get good reviews

i used this and ran part 1 for a couple of hours of driving, a LOT of **** came out when i flushed afterwards!

this was 2013 and the cooling / heating system has worked well ever since and coolant stays blue now.

Not sure that helps you Phil but though i’d share experience!

steve

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Flushed, new valve fitted, replaced thermostat and coolant bung. Hardest part was removing the extension to separate the valve, a couple of soakings of Blaster release agent did the trick. Now have heat in the cabin, hopefully not too long until i can give it a road test....

63293923353__F460190C-95BB-45FB-925D-D779F44988C7(1).jpg

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Excellent Phil

i’m hoping mine will arrive next week as i’m planning for TR garage action next weekend :-)

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