'90 740 Turbo - Water valve, Wot to do

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Skonnie - 28 Mar 2007 07:39 GMT

Hey all. For those wondering if I got the water pump off, I did.
Long story short, I had to find the 2nd bolt on the return tube near
the turbo mount in order to free it and the pump. Very exciting, not
really.

Having figured out said problem, I have discovered the water valve (or
heater valve?) to be unattached. Its pretty thoroughly rusted out,
and was lying in such a way as to suggest it had not been attached in
quite some time. Neither A/C or heat have worked in my car in quite
some time, so I'm not worried about that. Since I can't find any good
diagrams online, is this something that will prevent me from driving
once the water pump, etc is back in? I don't even know where to put a
new one in. I can't tell how integral is it to the coolant system,
this Chilton manual is worthless.

Thanks again for any and all advice,

Again.

A

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James Sweet - 28 Mar 2007 07:50 GMT

> Hey all. For those wondering if I got the water pump off, I did.
> Long story short, I had to find the 2nd bolt on the return tube near
[quoted text clipped - 16 lines]
>
> A

The car will run without a heater valve if it's been bypassed, but the
part is so cheap why not replace it and have working heat? It goes in
between the heater core and the engine, the heater core pipes poke out
of the firewall. There's also a small vacuum hose to control the heater
valve.

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Skonnie - 28 Mar 2007 16:40 GMT

> The car will run without a heater valve if it's been bypassed, but the
> part is so cheap why not replace it and have working heat? It goes in
> between the heater core and the engine, the heater core pipes poke out
> of the firewall. There's also a small vacuum hose to control the heater
> valve.

The heater valve has definitely been bypassed, tho that may be only
the first in a series of things that would need to be fixed in order
for me to have heat. There is no fan or blower action at all, leading
me to think that these might have been disconnected as well. But
that's tomorrow's project.

Neither Haynes, Chilton, vlvworld.com or anywhere else seems to have
good diagrams of the heater valve and surrounding area. Any links or
tips?

Thank you, Mr. Sweet.

A

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Joe - 28 Mar 2007 23:39 GMT

> Hey all. For those wondering if I got the water pump off, I did.
> Long story short, I had to find the 2nd bolt on the return tube near
[quoted text clipped - 14 lines]
>
> Again.

This URL is for 700/900, but I believe them to be identical to the 200's as
well:

http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#WaterValveRepla
cement

joe

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Skonnie - 29 Mar 2007 04:56 GMT

> This URL is for 700/900, but I believe them to be identical to the 200's as
> well:
>
> http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#Wate...
>
> joe

Thanks, Joe. For those who care (all three of us apparently) I got
the pump in, but was stymied by a lower radiator hose that failed
right at the turbo tube. Coolant everywhere, even before I got a
chance to start her up. Funny enough, it was one of the first leaks I
noticed several weeks ago when this whole saga began. In all this
Kenneth Starr-esque roving investigation, I totally forgot about it.
What's another 3 to 4 days after all this wait anyway.

I'll check the links, thanks. Heat would be great, especially during
the foggy torrential rains we get here occasionally. Its hard to stop
every 5 minutes to clear up the windshield.

Off to drink heavily.

A

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James Sweet - 29 Mar 2007 08:58 GMT

>>This URL is for 700/900, but I believe them to be identical to the 200's as
>>well:
[quoted text clipped - 18 lines]
>
> A

Well better that the hose failed there than out on the road somewhere.

Reply to this Message

James Sweet - 29 Mar 2007 08:57 GMT

>>Hey all. For those wondering if I got the water pump off, I did.
>>Long story short, I had to find the 2nd bolt on the return tube near
[quoted text clipped - 21 lines]
>
> joe

The heating system in a 200 is completely different than the one in a
700/900. The engine and transmission are pretty much the same but that's
about it.

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