Actually, that is a heat activated vacuum switch. There is a smog part
somewhere that kicks into action when the heat rises to a certain level. The
vacuum source is the intake manifold, and there is some kind of load
somewhere that turns on, or off, when the heat rises.




"bizbee" <tuberoo@earthlink.net> wrote in message
news:TmnCc.15479$Wr.7387@newsread1.news.pas.earthl ink.net...
> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> 258.
> On the heater hose that is connected to the thermostat housing,
> there's a brass fixture with some kind of valve screwed into it. The
> hose is connected to one side, then the other. The valve is vaguely
> spark-plug shaped, but only about an inch long, plastic, with three
> vacuum hoses coming off of it... at least I assume they're vacuum
> hoses, operating on the vacuum created by the passing water above. The
> problem is, this thing is plastic, and, wonder of wonders, it's
> cracked around one of the vacuum line connections. Anyone want to take
> a shot? Seems like I knew the name of this bugger, but for the life of
> me, I can't remember.
>

 

Actually, that is a heat activated vacuum switch. There is a smog part
somewhere that kicks into action when the heat rises to a certain level. The
vacuum source is the intake manifold, and there is some kind of load
somewhere that turns on, or off, when the heat rises.




"bizbee" <tuberoo@earthlink.net> wrote in message
news:TmnCc.15479$Wr.7387@newsread1.news.pas.earthl ink.net...
> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> 258.
> On the heater hose that is connected to the thermostat housing,
> there's a brass fixture with some kind of valve screwed into it. The
> hose is connected to one side, then the other. The valve is vaguely
> spark-plug shaped, but only about an inch long, plastic, with three
> vacuum hoses coming off of it... at least I assume they're vacuum
> hoses, operating on the vacuum created by the passing water above. The
> problem is, this thing is plastic, and, wonder of wonders, it's
> cracked around one of the vacuum line connections. Anyone want to take
> a shot? Seems like I knew the name of this bugger, but for the life of
> me, I can't remember.
>

 

Actually, that is a heat activated vacuum switch. There is a smog part
somewhere that kicks into action when the heat rises to a certain level. The
vacuum source is the intake manifold, and there is some kind of load
somewhere that turns on, or off, when the heat rises.




"bizbee" <tuberoo@earthlink.net> wrote in message
news:TmnCc.15479$Wr.7387@newsread1.news.pas.earthl ink.net...
> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> 258.
> On the heater hose that is connected to the thermostat housing,
> there's a brass fixture with some kind of valve screwed into it. The
> hose is connected to one side, then the other. The valve is vaguely
> spark-plug shaped, but only about an inch long, plastic, with three
> vacuum hoses coming off of it... at least I assume they're vacuum
> hoses, operating on the vacuum created by the passing water above. The
> problem is, this thing is plastic, and, wonder of wonders, it's
> cracked around one of the vacuum line connections. Anyone want to take
> a shot? Seems like I knew the name of this bugger, but for the life of
> me, I can't remember.
>

 

"bizbee" <tuberoo@earthlink.net> wrote in message
news:6XnCc.15500$Wr.13436@newsread1.news.pas.earth link.net...
> On Wed, 23 Jun 2004 17:44:33 -0500 in
> <oJnCc.19085$cj3.10641@lakeread01>, "DougW"
> <post.replies@invalid.address> graced the world with this thought:
>
> >bizbee did pass the time by typing:
> >> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> >> 258.
> >> On the heater hose that is connected to the thermostat housing,
> >> there's a brass fixture with some kind of valve screwed into it. The
> >> hose is connected to one side, then the other. The valve is vaguely
> >> spark-plug shaped, but only about an inch long, plastic, with three
> >> vacuum hoses coming off of it... at least I assume they're vacuum
> >> hoses, operating on the vacuum created by the passing water above. The
> >> problem is, this thing is plastic, and, wonder of wonders, it's
> >> cracked around one of the vacuum line connections. Anyone want to take
> >> a shot? Seems like I knew the name of this bugger, but for the life of
> >> me, I can't remember.
> >
> >It is operated by the coolant temperature. Your looking at a thermal
> >switch used by the vac system to determine when the engine is hot. I
> >forget exactly what it hooks to. Vacuume comes from a port on the carb.
>
> Yeah, but <what do you call it>? I need to replace it, I don't know
> what to ask for... lol My damn Chilton's doesn't seem to have any
> reference to it. Thermal vacuum valve? Thermal vacuum switch? It looks
> like it costs all of about a dollar. It got replaced at another point,
> but I was having the carb rebuilt at the time, so didn't do it
> myself... but I remember the guy showing me where it cracked, and this
> one is broken in the same place--naturally.

That's easy, take it off and use your other car to go to the store for
another one.

 

"bizbee" <tuberoo@earthlink.net> wrote in message
news:6XnCc.15500$Wr.13436@newsread1.news.pas.earth link.net...
> On Wed, 23 Jun 2004 17:44:33 -0500 in
> <oJnCc.19085$cj3.10641@lakeread01>, "DougW"
> <post.replies@invalid.address> graced the world with this thought:
>
> >bizbee did pass the time by typing:
> >> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> >> 258.
> >> On the heater hose that is connected to the thermostat housing,
> >> there's a brass fixture with some kind of valve screwed into it. The
> >> hose is connected to one side, then the other. The valve is vaguely
> >> spark-plug shaped, but only about an inch long, plastic, with three
> >> vacuum hoses coming off of it... at least I assume they're vacuum
> >> hoses, operating on the vacuum created by the passing water above. The
> >> problem is, this thing is plastic, and, wonder of wonders, it's
> >> cracked around one of the vacuum line connections. Anyone want to take
> >> a shot? Seems like I knew the name of this bugger, but for the life of
> >> me, I can't remember.
> >
> >It is operated by the coolant temperature. Your looking at a thermal
> >switch used by the vac system to determine when the engine is hot. I
> >forget exactly what it hooks to. Vacuume comes from a port on the carb.
>
> Yeah, but <what do you call it>? I need to replace it, I don't know
> what to ask for... lol My damn Chilton's doesn't seem to have any
> reference to it. Thermal vacuum valve? Thermal vacuum switch? It looks
> like it costs all of about a dollar. It got replaced at another point,
> but I was having the carb rebuilt at the time, so didn't do it
> myself... but I remember the guy showing me where it cracked, and this
> one is broken in the same place--naturally.

That's easy, take it off and use your other car to go to the store for
another one.

 

"bizbee" <tuberoo@earthlink.net> wrote in message
news:6XnCc.15500$Wr.13436@newsread1.news.pas.earth link.net...
> On Wed, 23 Jun 2004 17:44:33 -0500 in
> <oJnCc.19085$cj3.10641@lakeread01>, "DougW"
> <post.replies@invalid.address> graced the world with this thought:
>
> >bizbee did pass the time by typing:
> >> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> >> 258.
> >> On the heater hose that is connected to the thermostat housing,
> >> there's a brass fixture with some kind of valve screwed into it. The
> >> hose is connected to one side, then the other. The valve is vaguely
> >> spark-plug shaped, but only about an inch long, plastic, with three
> >> vacuum hoses coming off of it... at least I assume they're vacuum
> >> hoses, operating on the vacuum created by the passing water above. The
> >> problem is, this thing is plastic, and, wonder of wonders, it's
> >> cracked around one of the vacuum line connections. Anyone want to take
> >> a shot? Seems like I knew the name of this bugger, but for the life of
> >> me, I can't remember.
> >
> >It is operated by the coolant temperature. Your looking at a thermal
> >switch used by the vac system to determine when the engine is hot. I
> >forget exactly what it hooks to. Vacuume comes from a port on the carb.
>
> Yeah, but <what do you call it>? I need to replace it, I don't know
> what to ask for... lol My damn Chilton's doesn't seem to have any
> reference to it. Thermal vacuum valve? Thermal vacuum switch? It looks
> like it costs all of about a dollar. It got replaced at another point,
> but I was having the carb rebuilt at the time, so didn't do it
> myself... but I remember the guy showing me where it cracked, and this
> one is broken in the same place--naturally.

That's easy, take it off and use your other car to go to the store for
another one.

 

"bizbee" <tuberoo@earthlink.net> wrote in message
news:6XnCc.15500$Wr.13436@newsread1.news.pas.earth link.net...
> On Wed, 23 Jun 2004 17:44:33 -0500 in
> <oJnCc.19085$cj3.10641@lakeread01>, "DougW"
> <post.replies@invalid.address> graced the world with this thought:
>
> >bizbee did pass the time by typing:
> >> OK, this is irritating the hell out of me. I have an '80 CJ5 with a
> >> 258.
> >> On the heater hose that is connected to the thermostat housing,
> >> there's a brass fixture with some kind of valve screwed into it. The
> >> hose is connected to one side, then the other. The valve is vaguely
> >> spark-plug shaped, but only about an inch long, plastic, with three
> >> vacuum hoses coming off of it... at least I assume they're vacuum
> >> hoses, operating on the vacuum created by the passing water above. The
> >> problem is, this thing is plastic, and, wonder of wonders, it's
> >> cracked around one of the vacuum line connections. Anyone want to take
> >> a shot? Seems like I knew the name of this bugger, but for the life of
> >> me, I can't remember.
> >
> >It is operated by the coolant temperature. Your looking at a thermal
> >switch used by the vac system to determine when the engine is hot. I
> >forget exactly what it hooks to. Vacuume comes from a port on the carb.
>
> Yeah, but <what do you call it>? I need to replace it, I don't know
> what to ask for... lol My damn Chilton's doesn't seem to have any
> reference to it. Thermal vacuum valve? Thermal vacuum switch? It looks
> like it costs all of about a dollar. It got replaced at another point,
> but I was having the carb rebuilt at the time, so didn't do it
> myself... but I remember the guy showing me where it cracked, and this
> one is broken in the same place--naturally.

That's easy, take it off and use your other car to go to the store for
another one.

 

Yup, there was only a couple of months my CJ-5 was the primary
vehicle.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

CRWLR wrote:
>
> That's easy, take it off and use your other car to go to the store for
> another one.

 

Yup, there was only a couple of months my CJ-5 was the primary
vehicle.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

CRWLR wrote:
>
> That's easy, take it off and use your other car to go to the store for
> another one.

 

Yup, there was only a couple of months my CJ-5 was the primary
vehicle.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

CRWLR wrote:
>
> That's easy, take it off and use your other car to go to the store for
> another one.