Thermostat housing question

[Iqbal]

Hi guys,

Planning on changing my thermostat this afternoon. Polo 1.9 TDI ASZ.
To my knowledge, the thermostat has never been touched, with mileage on 300k+.
How brittle does the housing get, as I don't want to get stranded with a damaged housing when I try to remove it.
My understanding is it is quite expensive, as VW quoted me R1600 for the housing, if I understood the sales guy correctly.
Not sure if GW stock the housing, and what price they'd charge for it.

Thanks
Iqbal

[VGTI]

When I changed mine I battled to get the pipe off the "housing" so I left it on and just bent the pipe to get access...

Undo the bracket that hold the vacuum reservoir in place to gain more access to work.

Then just take out the two size 10 bolts and change the thermostat... not much to it, took me less than an hour.

[Stressboi]

Replaced my housing on my polo with w VW original thermostat and housing for R1000 , if you are in pretoria i can tell you which place sells VW original parts cheap

[Iqbal]

Thanks VGTI.

Stressboi, I'm in Centurion during the day.
Main worry is that the plastic might be brittle after so many years.

[Stressboi]

you get it together with the housing and thermostat the housing itsef is plastic

[Iqbal]

you get it together with the housing and thermostat the housing itsef is plastic

Already got the thermostat from VW. Just wanted to find out from the guys what the risk is of damaging the housing when I tackle it. Not keen on spending too much, unless really necessary. Where in Pta do I go, if I need to get it?

[Stressboi]

PRETORIA EAST SILVERTON CITY SPARES..... ITS GENUINE VW PRODUCTS THERE USED AND NEW

WHEN INSTALLING THE THERMOSTAT HOUSING BE VERY CAREFULL BECAUSE EVEN THE SLIGHTEST CRACK MEANS THE ENTIRE THING IS MESSED UP AND YOU HAVE TO GET A NEW ONE ,

[Iqbal]

That's what I'm worried about.

[Ashveer03]

Hi guys,

Planning on changing my thermostat this afternoon. Polo 1.9 TDI ASZ.
To my knowledge, the thermostat has never been touched, with mileage on 300k+.
How brittle does the housing get, as I don't want to get stranded with a damaged housing when I try to remove it.
My understanding is it is quite expensive, as VW quoted me R1600 for the housing, if I understood the sales guy correctly.
Not sure if GW stock the housing, and what price they'd charge for it.

Thanks
Iqbal

As vgti said, the pipe can be a beach to come off. And i highly doubt that stupid plastic piece is R1600 even from vw. I think u looking at the wrong part.

The thermostat is situated on the BLOCK, it will be behind the alternator/ac pump area.
Follow the lower radiator hose and it will take u to the thermo housing.

Sent from my SM-J500F using Tapatalk

[Ashveer03]

you get it together with the housing and thermostat the housing itsef is plastic

Op has an ASZ tdi. Completely different from your BAH

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[Iqbal]

Hi guys,

Planning on changing my thermostat this afternoon. Polo 1.9 TDI ASZ.
To my knowledge, the thermostat has never been touched, with mileage on 300k+.
How brittle does the housing get, as I don't want to get stranded with a damaged housing when I try to remove it.
My understanding is it is quite expensive, as VW quoted me R1600 for the housing, if I understood the sales guy correctly.
Not sure if GW stock the housing, and what price they'd charge for it.

Thanks
Iqbal

As vgti said, the pipe can be a beach to come off. And i highly doubt that stupid plastic piece is R1600 even from vw. I think u looking at the wrong part.

The thermostat is situated on the BLOCK, it will be behind the alternator/ac pump area.
Follow the lower radiator hose and it will take u to the thermo housing.

Sent from my SM-J500F using Tapatalk

Thanks Ashveer,
Going through the forum, someone posted a "how to", but the problem with old threads is that the pics no longer display. Will double check on price at VW. Will pop past GW and see if they stock the part, and how much.

[Ashveer03]

Here is the asz thermo housing

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[Iqbal]

Thanks. Cant't believe it can cost too much, even at VW. Thinking of doing the Coolant temperature sensor as well. Would the GW one be good enough, or should I stick to OEM?

Looking at the pic, should I put some sort of gasket maker as a precaution against a possible leak?

[Ashveer03]

Gw coolant temp sensors work ok never had a problem with them..

The housing has an o-ring, u can clean it up and use a TOUCH of silicone on it.

Thermostat u rather get from vw, pirate ones tend to open too soon - the car wont reach operating temp quickly.

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[Iqbal]

Shot bud. Got the thermostat from VW. Will pick up the coolant temp sensor on my way home. Will definitely use just a little bit of silicone. Always scared the stuff will get into the system and clog something.

[Ashveer03]

U dont really need the silicone, but a little just on the o-ring wouldnt kill. Surfaces must be clean though

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[VGTI]

I am sure I got the o-ring with the thermostat from VW

[Iqbal]

Hi guys,

So VW supplied the O-ring as well (priced separately). Got the Thermostat housing (included o-ring) from GW for about R110, as well as the coolant temperature sensor. The coolant sensor was very easy to do. Thermostat was relatively easy to do, based on the guidance I got on the forum.
Encountered 1 snag. bottom housing bolt managed to drop into the gap between the engine and Alternator mounting. Did not drop to the floor, but could not find it with my fat fingers or my daughter's thin fingers. Had to wait till this morning to buy a replacement bolt and close everything up.

Task was made much easier with the tips I got, but was not as scary as some made it out to be.

Thanks guys.

[Ashveer03]

It is quite easy to do, glad u got it sorted out without a hassle..

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[Shadrin]

Hi guys after replacing my thermostat and a new water bottle after travelling at 160kmh my car use water. Plrase help.

[panic-mechanic]

not enough info.