Possible vacuum leak

**Utemad** · 12th September 2007, 11:04 AM

Originally Posted by wrex

On my Disco 3.9, I have a small hose that plugs into a vacuum operated type of switch on the heater hoses, it has been unplugged since I bought the car......Also, the heater is not very strong, either with the hose plugged in or not.

The tap is a vacuum controlled coolant tap for your heater. With the vacuum line unplugged the tap is shut so that is why your heater doesn't work well.

When you disconnect the vacuum pipe to make the car run better do you plug the pipe? If you do plug it then maybe your coolant tap is leaking the vacuum.

I'd be plugging the vacuum line for the coolant tap and trying to tune it and get it running properly. However with the heater controls on 'cool' the hose should be effectively plugged anyway. Maybe not 100% plugged though and hence it runs better but not perfect?

Whatever is going on I'd be pricing a coolant tap.

**wrex** · 12th September 2007, 01:45 PM

Originally Posted by Utemad

I'd be plugging the vacuum line for the coolant tap and trying to tune it and get it running properly. However with the heater controls on 'cool' the hose should be effectively plugged anyway. Maybe not 100% plugged though and hence it runs better but not perfect?

Sorry, no intention of high jacking this thread... just one more question

Did that setup change on later Discos cause my Dad's 97 does not have a coolant tap?

In the mean time I'll plug the hose and see if I can get that coolant tap.

**Utemad** · 12th September 2007, 09:02 PM

Originally Posted by wrex

Sorry, no intention of high jacking this thread... just one more question

Did that setup change on later Discos cause my Dad's 97 does not have a coolant tap?

In the mean time I'll plug the hose and see if I can get that coolant tap.

Hijack?....what hijack?

AFAIK all the V8 Disco1 have a fuel tap. I recently learnt here that the Tdi does not have one though (RAVE backs that up). It is possible that the fitter removed the tap for the LPG install and it just works as per the Tdi setup I suppose.
(my Disco is currently in at C&G by the way).

**PhilipA** · 13th September 2007, 08:51 AM

While I have never thoroughly looked in my 92 RRC, I am pretty sure that the vacuum device at the air con in the cabin is a Flap controller to direct the air from the aircon when on to the face vents.
The reason I say this is that I have experienced the air output changing from the vents to the footwells going up steep hills.
I believe and have never seen to the contrary that the heater matrix is always on in RRC and Disco prior to the "Soft Dash" and ditto for Disco. IE There is no tap but there is a flap motor.
In Falcons etc , these are notorious for failing and leaking..
Regards Philip A

**Utemad** · 13th September 2007, 10:05 AM

Originally Posted by Utemad

AFAIK all the V8 Disco1 have a fuel tap.

Whoops...I meant coolant tap.

Originally Posted by PhilipA

While I have never thoroughly looked in my 92 RRC, I am pretty sure that the vacuum device at the air con in the cabin is a Flap controller to direct the air from the aircon when on to the face vents.............the heater matrix is always on in RRC and Disco prior to the "Soft Dash" and ditto for Disco.

That is possible. However we are talking Disco1 updates here aren't we?

**PhilipA** · 13th September 2007, 01:01 PM

No the original post was for a RRC1993. I cannot remember whgen the Disco got the dash up date 1994??
Regards Philip A

**Utemad** · 13th September 2007, 01:12 PM

Originally Posted by PhilipA

No the original post was for a RRC1993. I cannot remember whgen the Disco got the dash up date 1994??
Regards Philip A

oh ok I was thinking 3.9 was the softdash.

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