baronwood

I really need to find the thermostat housing on a 98 Audi 90, is it under the waterpump assembly. I need some help here, thanks.

quattro.pilot

it's in the middle-front of the block. conveniently hidden behind the timing belt.

baronwood

Do you happen to have a page from a manual showing the exploded view, that can be e-mailed to me..
And thanks for the info so quickly.

quattro.pilot

definitely find something. In fact, pretty much for every question you can think of you should start by thoroughly searching our archives. Usually right off the bat we instruct every noob to make a good attempt before asking questions...mostly because whatever you'll come across is a generic problem that has been "solved" many many many times over.

so I've bailed you out this once, but in the future make a effort please & thank you.

UrbanAssaultAudi

REMOVAL
Remove ribbed drive belt.
Loosen toothed timing belt as required (it is not necessary to remove toothed timing belt).
<a href="http://photobucket.com" target="_blank"><img src="http://i51.photobucket.com/albums/f400/Ashnjerm/62484198.gif" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
Unbolt thermostat housing and pull out from below toothed belt.
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Installation position of thermostat.


The vent valve must be installed facing up (arrow).

INSTALLATION
Installation is the reverse of removal, noting the following:
Adjust tension of toothed timing belt.

S4gasm (LoTR)

<center><img src="https://www.audiworld.com/tech/pics/eng102_TB038.jpg"></center><p>there is a write up on 20v.org to follow, and i covered it in my write up in the tech articles...search my friend.

Blake@NWAutoSalon

:-P
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Honeywell_thermostat.jpg/613px-Honeywell_thermostat.jpg">