I recently replaced the heater hoses and heater control valve on my 95 940. It wasn't exactly fun, but I do not remember cursing even once :)

All poster full of very good information. Change the hoses for sure. Can't stress enough the importance of cutting the hoses off the heater core. And do not cut all the way through the hose such that you cut into the soft copper nipple. If you do, the new hose may leak.

I suggest you do not cut the hose off the nipple as if you were performing a circumcision. Instead, use a slight spiral to "unfurl" the hose from the nipple. If you cut through the hose and just down to the nipple, the hose should peel offn easily.

just my .02

Use gloves. Get new heater hoses as well.
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Warren Bain - '99 V70GLT G-Valve > 80K mi, 89 300SE, '96 965 >120Kmi, near Manassas Va.. Check the 700/900 FAQ via the 'features' pull down menu. This post written with 100% recycled electrons.

Dear Fellow Brickboarders,

May this find you well. It is standard practice, to install the heater control valve into its hoses, and then install this assembly? Or, does the hose have to be attached to the tube from the water pump, the heater valve then inserted into the hose, and the hose then run from the control valve to the firewall nipple?

The return line is obviously a straight run, so the hose must be threaded through the maze, until it reaches the port on the side of the intake manifold.

Thanks for any light you can shed on this.

Yours faithfully,

spook

Good idea to change the hoses with the valve. As Jim mentioned, the hose connection under the intake is a real knuckle buster. Took me a while to get the hose to seat properly there. If you pull the manifold back, here's the view:



Certainly not necessary to pull the manifold to do the job, though. Good access to the breather box, if that's on your 'to do' list...

The heater hoses might be stuck to the heater core nipples on the firewall... you might have to cut the hoses to remove them. The nipples are soft and easy to damage, so be careful there. Don't think you need to do anything special with the vac line.

There was a discussion in the 900 forum recently on the pros & cons of OE vs. aftermarket heater hoses... you might want to check that out.

- Brian '93 945T

I did this recently on my '93 940 NA. Assuming the layout of the valve is the same, it won't be too hard. The heater control can be in any position for this. I replaced the hoses as well as the valve and left some knuckle skin under there. If I do it again, I'll loosen the intake manifold and pull it back to let me see what I'm doing.

If you're only doing the valve it will still have to be done by touch but it shouldn't be as difficult. It was the proper location and orientation of the hoses that gave me trouble. Also be sure the vacuum line is on securely. I didn't get mine on right and the valve wouldn't work.