What do I need? Paste renewal (1 Viewer)

[WESTY66]

Think we know someone that daft

Can’t say that about Jackd

 

[Jackd]

Can’t say that about Jackd

Leave me out of it thank you girls

 

[Bustup15]

Why post then if you have not done the job or understand it.
Paste thickness is fairly critical I know someone who put it on too thick and the fridge hardly had any cooling at all.

Lenny, I'm sure you are correct in your statements, however, I found that on my van the layout of the cooling tubes in relation to the cutout of the top surround of the fridge prevented the fins coming into contact at all unless there was a very heavy layer of paste applied. Resulted in a significant improvement in performance in my specific installation.

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[Two on Tour]

Lenny, I'm sure you are correct in your statements, however, I found that on my van the layout of the cooling tubes in relation to the cutout of the top surround of the fridge prevented the fins coming into contact at all unless there was a very heavy layer of paste applied. Resulted in a significant improvement in performance in my specific installation.

As Lenny says, in normal circumstances a thin application to where the two surfaces touch offers the best results, but I would imagine that in your case that the thermal paste now at least has contact where possibly there was none before.

 

[Bustup15]

As Lenny says, in normal circumstances a thin application to where the two surfaces touch offers the best results, but I would imagine that in your case that the thermal paste now at least has contact where possibly there was none before.

That's what I said

 

[Mike800966]

Well at last I got round to doing it. Dometic RM4401. Everything seemed to work fine but in the morning the fridge was usually down to about +7 degree, after a day of use it would go up to +10 or even +12 according to the cheapo temp display. This suggested to me that we might not be getting the full cooling power in the fridge compartment.
Being a bit more scientific and without altering the thermostat position and giving everything 24hrs to settle, (van is a bit sloping on ehu). Freezer was at -17 fridge +9.
I removed the heat exchanger unit inside the cabinet , T25 torx self tappers and carefully prised away the plastic carrier for the fridge thermostat which hides beneath the white plastic trim and just pushes in between the fins.
The black sloping tube that I could see was the cold source and it and the exchanger were covered in grey mastic which I carefully scraped and solvented away. I am of the view that it was just non-setting bedding mastic as used on motorhome windows! Smelt of White Spirit.
Cleaned up and eased of some high points on the foamed insulation. Coated pipe and exchanger with some Dow Corning heatsink paste. Reasembled all.
Freezer now at -17 fridge at +3 after 24 hrs.
Lets hope that it will now copes better with door opening and ingress of warm air.
Hope this helps someone
Mike

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[WESTY66]

Well at last I got round to doing it. Dometic RM4401. Everything seemed to work fine but in the morning the fridge was usually down to about +7 degree, after a day of use it would go up to +10 or even +12 according to the cheapo temp display. This suggested to me that we might not be getting the full cooling power in the fridge compartment.
Being a bit more scientific and without altering the thermostat position and giving everything 24hrs to settle, (van is a bit sloping on ehu). Freezer was at -17 fridge +9.
I removed the heat exchanger unit inside the cabinet , T25 torx self tappers and carefully prised away the plastic carrier for the fridge thermostat which hides beneath the white plastic trim and just pushes in between the fins.
The black sloping tube that I could see was the cold source and it and the exchanger were covered in grey mastic which I carefully scraped and solvented away. I am of the view that it was just non-setting bedding mastic as used on motorhome windows! Smelt of White Spirit.
Cleaned up and eased of some high points on the foamed insulation. Coated pipe and exchanger with some Dow Corning heatsink paste. Reasembled all.
Freezer now at -17 fridge at +3 after 24 hrs.
Lets hope that it will now copes better with door opening and ingress of warm air.
Hope this helps someone
Mike

Great news, just what I wanted to hear, that sounds exactly the same as my fridge!
Am I right in thinking you don’t need to do the freezer?

 

[Mike800966]

No the heat exchanger is visible at the back of the fridge compartment, just watch out that you dont damage the thermostat sensor at the top left corner hidden behind the plastic top cover strip ( that you never knew was there before!) 2 hr job even if you go slowly and made a big difference for me .
Mike

 

[Lenny HB]

Great news, just what I wanted to hear, that sounds exactly the same as my fridge!
Am I right in thinking you don’t need to do the freezer?

It's the same evaporator pipe that runs through the freezer so well worth doing.

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[WallaceandGromit]

Had a quick look at my Thetford N175 fridge and there are no visible fixing in the cabinet, am I looking in the wrong place

 

[ctc]

C‘mon Lenny HB i thought you would have dived straight in to steer me right on what Fans to fit!!
My old ones had a blue led when they were on shining through the grill, this one has got a red led shining through and I think I’d prefer some nice fans with blue leds to shine through the grill when they’re on and spinning round!!
Anyone??

Computer fans from your council tip, free!

 

[WESTY66]

Well I’ve looked all over for some fans that have a blue led (like the ones that were on and stopped working and foolishly gibbed them before I could find out the make of them) when they’re spinning round but have so far drawn a blank! Had all the rainbow couloirs thingies, but not the blue led

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[Reallyretired]

I used GD900. Only one syringe needed. Fridge now works brilliantly.
When I took the finny thing off there was virtually no paste behind it, and what traces there was was dried up.
Dometic spoiling the ship for a happorth of tar, or a couple of quids worth of thermal paste in this case.

 

[Jackd]

Had all the rainbow couloirs thingies, but not the blue led

I think you’ll find that “rainbow” is on trend these days mate.

 

[WESTY66]

I think you’ll find that “rainbow” is on trend these days mate.

Doesnt go with the pineapples

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[Jackd]

Doesnt go with the pineapples

I had discreetly forgotten about that little detail Ady

 

[Jasz]

For the amount required for the run-of-the-mill motorhome F/F (usually about 30g) the cost is a big factor and for the most part, as you will well know the amount needed for a CPU is only a gram or two, and at £10 and upwards for a 3.5g syringe of the high-performance thermal pastes, to me that makes the experts opinions irrelevant for our intended use for thermal paste, but for CPU cooling, I would likely be interested in their expert opinions.

For Funsters, go with the tried and tested options of other Funsters, and for me, that's either Halnziye HY610 Gold or as I prefer, GD900.

That was helpful, I was wondering how much I would need.

 

[Two on Tour]

That was helpful, I was wondering how much I would need.

As I said at the start of my post, 30g will be enough normally.

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[WESTY66]

Well the paste came yesterday……just before it’s gone into the dealers for the week
At least I’ll have summat to do next weekend for a few hours

 

[Jackd]

Well the paste came yesterday……just before it’s gone into the dealers for the week
At least I’ll have summat to do next weekend for a few hours

You and me both next weekend

 

[Lenny HB]

Well the paste came yesterday……just before it’s gone into the dealers for the week
At least I’ll have summat to do next weekend for a few hours

A few hours? Just done Phil's Taran_Las on my drive, would have been less than ½ hr if we had have stopped gassing.

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[Coastal Cruiser.]

You and me both next weekend

Are you supervising him then Brian?

 

[Coastal Cruiser.]

Well the paste came yesterday……just before it’s gone into the dealers for the week
At least I’ll have summat to do next weekend for a few hours

A week
That don’t sound cheap

 

[WESTY66]

A week
That don’t sound cheap

It isn’t!! But I need to make sure it’s for when Brian Jackd takes delivery

I don’t want him on the blower every other day

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[WESTY66]

A few hours? Just done Phil's Taran_Las on my drive, would have been less than ½ hr if we had have stopped gassing.

It’s about bloody time you started practising on Carthagos

 

[Lenny HB]

It’s about bloody time you started practising on Carthagos

I will when I get one, could be a long wait.

 

[Jackd]

It’s about bloody time you started practising on Carthagos

I’m closest. Lenny can practice on mine

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[Coastal Cruiser.]

I will when I get one, could be a long wait.

Watch out Lenny, ever time I meet a Carthargo owner it costs me

 

[WESTY66]

Well run some tests over the last few days having done the paste thing, fridge is far better on ehu. 7.6 on gas with 3 fans on, then switched to ehu, 24 hrs later fridge on 1.9 could it be that the gas side of things need a check up?

 

[WESTY66]

I use GD900 thermal paste as it has the best thermal conductivity for the price with a thermal conductivity of 4. 8 w/m-k or better.
You can get thermal paste with 8w/m-k thermal conductivity but for the amount you will need it's prohibitively expensive.
a 30g syringe will normally do a 3 way fridge.

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I did the paste thing using this stuff and I found it rather runny, and I can’t help thinking that as soon as I put it back vertical it’s all slid off, as the fridge isn’t working very good again, sometimes it’s ok, sometimes not, seems better on ehu and have to have it on full!
The freezer seems ok but the other day they both went warm. Right now it’s gone up a degree since going on gas (6.0) freezer has gone colder (-21) I’m at a loss with the thing, it’s looking like a new fridge!
The gas side has been checked out at premium motorhomes and found to be working as it should, and although the gas has a steady roar, it doesn’t sound like a jet taking off like I’ve heard others do

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