[xj] Heater Blowers

XJ
1

Hi all,
Thanks for the input so far,
The only fuse that feed the blowers is in the aux fuse box under the
passenger dash, Right??
#4, a 50 amp fuse, Right?? Does this fuse feed anything else?
Will replace fuse tommorrow and give it a try.

Thanks to Greg ,Wilson, & all.

Ed

2

Yes, it’s actually fuse #16, auxiliary fuse panel, LHD cars after '83, 50 A
(that is the blow rating). That will be the problem and the solution.
Gregory----- Original Message -----
From: Your Name ED-TONI@worldnet.att.net
To: xj-digest@jag-lovers.org; xj@jag-lovers.org
Sent: Wednesday, November 10, 1999 1:37 AM
Subject: [xj] Heater Blowers

Hi all,
Thanks for the input so far,
The only fuse that feed the blowers is in the aux fuse box under the
passenger dash, Right??
#4, a 50 amp fuse, Right?? Does this fuse feed anything else?
Will replace fuse tommorrow and give it a try.

Thanks to Greg ,Wilson, & all.

Ed

3

I’m having no heat as well. Here’s my situation:
The air works fine, but when I turn the temp knob to a hotter temp, say, 85,
no heat comes out. The engine was running at 85C, so it should blow heat,
but at all the fan speeds cold air comes out of the vents. I tried all the
speeds, auto and the defroster, and all gave the same effect.

4

I’m having no heat as well. Here’s my situation:
The air works fine, but when I turn the temp knob to a hotter temp, say, 85,
no heat comes out. The engine was running at 85C, so it should blow heat,
but at all the fan speeds cold air comes out of the vents. I tried all the
speeds, auto and the defroster, and all gave the same effect.

That reminds me, I know the machine has three speed settings on the panel, but how many real speeds does the blower system have? My “low” manual setting is still out, but it seems to have some medium speed that it uses when it is cold out and I have the heater on and set to “auto”.

5

Paul: it sounds as though your heater valve is stuck closed, and/or the
vacuum connection to it has come adrift. TRhe heater valve is on the engine
side of the firewall, centre top. The valves are replaceable, not expensive;
removed by removing the chrome air grille at the windscreen for access to
the bolts.
Gregory----- Original Message -----
From: Paul paulbentz@home.com
To: Dr. Gregory Andrachuk <@Gregory_Andrachuk>; Your Name
ED-TONI@worldnet.att.net; xj@jag-lovers.org
Sent: Wednesday, November 10, 1999 3:12 PM
Subject: Re: [xj] Heater Blowers

I’m having no heat as well. Here’s my situation:
The air works fine, but when I turn the temp knob to a hotter temp, say,
85,
no heat comes out. The engine was running at 85C, so it should blow heat,
but at all the fan speeds cold air comes out of the vents. I tried all the
speeds, auto and the defroster, and all gave the same effect.

6

There are at least 4 speeds to the blowers on the S3 car.
Gregory----- Original Message -----
From: spectre spectre@fok.com
To: Paul paulbentz@home.com
Cc: xj@jag-lovers.org
Sent: Wednesday, November 10, 1999 5:46 PM
Subject: Re: [xj] Heater Blowers

I’m having no heat as well. Here’s my situation:
The air works fine, but when I turn the temp knob to a hotter temp, say,
85,
no heat comes out. The engine was running at 85C, so it should blow heat,
but at all the fan speeds cold air comes out of the vents. I tried all
the
speeds, auto and the defroster, and all gave the same effect.

That reminds me, I know the machine has three speed settings on the panel,
but how many real speeds does the blower system have? My “low” manual
setting is still out, but it seems to have some medium speed that it uses
when it is cold out and I have the h

7

At 04:47 PM 11/10/1999 -0800, you wrote:

There are at least 4 speeds to the blowers on the S3 car.
Gregory
----- Original Message -----

In the “Auto” position, “[i]n full heating, fan speeds are limited to Low
and MED 1 (2nd speed)”. Delanaire Mark II Environmental Control System
manual, p. 48.

= = = = = = = = = = = = =
Mark Moburg (@Mark_Moburg)
Seattle, Washington

8

There are at least 4 speeds to the blowers on the S3 car.

There are precisely four speeds, or five if you count “off” as one :slight_smile:

Craig

9

The factory manual gives no such statement, but it is correct that there are
two “medium” speeds, for a total of four. The HIGH and LOW positions
override the automatic selection and keep the fans at the highest or lowest
speeds.
Gregory----- Original Message -----
From: Mark Moburg markmoburg@mindspring.com
To: xj@jag-lovers.org
Sent: Wednesday, November 10, 1999 9:14 PM
Subject: Re: [xj] Heater Blowers

At 04:47 PM 11/10/1999 -0800, you wrote:

There are at least 4 speeds to the blowers on the S3 car.
Gregory
----- Original Message -----

In the “Auto” position, “[i]n full heating, fan speeds are limited to Low
and MED 1 (2nd speed)”. Delanaire Mark II Environmental Control System
manual, p. 48.

= = = = = = = = = = = = =
Mark Moburg (markmoburg@mindspring.com)
Seattle, Washington

10

The factory manual gives no such statement, but it is correct
that there are
two “medium” speeds, for a total of four. The HIGH and LOW positions
override the automatic selection and keep the fans at the
highest or lowest
speeds.
Gregory

Well, on page 82-8 section 82.00.00, under Servo Contol Unit it says
that “Four fan speeds are available on cooling, three on heating”.
However, along with the partial truths in the Jag manual, that is one of
them. I’ve spent some time getting to grips with the aircon system
(having restored the car, I got bored…I know - let’s service the servo
and blower fans!).

The cams will only allow low and med1 fan settings in “Auto” in full
heating mode, and all four in cooling. Exception 1 is defrost, when the
fast fan setting is preselected by the mode switch and a 27k resistor is
connected in series with the temperature sensors (to force the servo
into full heat position). Exception 2 is when Low is selected, when the
lowest fan speed is engaged, or High when the highest fan speed is
engaged.

So in cooling mode you get four possibles:

“Auto”: slow, M1, M2 and fast
“Lo”: only slow
“Hi”: only fast

And in heating mode, you get only three:

“Auto”: slow and M1
“Lo”: only slow
“Hi”: only fast

So you do get three speeds in heating (curiously the missing speed is
M2), but only by including the “Hi” setting as one of them.

Craig

11

Thanks, Craig. Correct as usual. Fortunately I have had no climate control
problems other than the occasional need for a recharge (and 8 years ago a
blown blower fuse!), so I bow to your expertise.
Gregory----- Original Message -----
From: Craig Sawyers c.sawyers@tech-enterprise.co.uk
To: ‘Dr. Gregory Andrachuk’ <@Gregory_Andrachuk>; ‘Mark Moburg’
markmoburg@mindspring.com
Cc: xj@jag-lovers.org
Sent: Friday, November 12, 1999 12:28 AM
Subject: RE: [xj] Heater Blowers

The factory manual gives no such statement, but it is correct
that there are
two “medium” speeds, for a total of four. The HIGH and LOW positions
override the automatic selection and keep the fans at the
highest or lowest
speeds.
Gregory

Well, on page 82-8 section 82.00.00, under Servo Contol Unit it says
that “Four fan speeds are available on cooling, three on heating”.
However, along with the partial truths in the Jag manual, that is one of
them. I’ve spent some time getting to grips with the aircon system
(having restored the car, I got bored…I know - let’s service the servo
and blower fans!).

The cams will only allow low and med1 fan settings in “Auto” in full
heating mode, and all four in cooling. Exception 1 is defrost, when the
fast fan setting is preselected by the mode switch and a 27k resistor is
connected in series with the temperature sensors (to force the servo
into full heat position). Exception 2 is when Low is selected, when the
lowest fan speed is engaged, or High when the highest fan speed is
engaged.

So in cooling mode you get four possibles:

“Auto”: slow, M1, M2 and fast
“Lo”: only slow
“Hi”: only fast

And in heating mode, you get only three:

“Auto”: slow and M1
“Lo”: only slow
“Hi”: only fast

So you do get three speeds in heating (curiously the missing speed is
M2), but only by including the “Hi” setting as one of them.

Craig