[xj] Heater fan upgrade

Hello all! My right side heater blower has died and I was
wondering if anyone has tried to replace the blower fans
in a series 3 xj6 with something more powerful? The stock
fans don’t seam to move a lot of air. Any help would be
much appreciated.–
Jhillzoom
Charlotte, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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In reply to a message from Jhillzoom sent Tue 22 Mar 2016:

Currently doing that with my S1 XJ… using GM fans from a 1993
1993 Chevy Blazer S10. But, I have no idea what the S3 fans look
look like.

These fans have to use aftermarket cages as the Jag units ar
are plastic and non directional. FASCO metal cages have set sc
screws and 5/16’’ shaft sizes… cannot find the numbers ri
right now.

Fan # 240-195 for the drivers side and 240-212 for the
passenger side (Delco 15-80386.

I bought a cheap Anemometer and it shows almost 12 MPH for
wind speed at the side vents versus 7 MPH for the Jag units.

One fan is installed right now and the other will go in
hopefully today… I expect more MPH with the two GM fans
and directional cages.–
The original message included these comments:

Hello all! My right side heater blower has died and I was
wondering if anyone has tried to replace the blower fans
in a series 3 xj6 with something more powerful? The stock
fans don’t seam to move a lot of air. Any help would be


'71 XJ6 383/200R, 2015 Dodge Ram 1500 4X4 Eco Diesel
Glendora, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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The archives and FAQ will answer many queries on the XJ series…
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1 Like

Hello all! My right side heater blower has died and I was
wondering if anyone has tried to replace the blower fans
in a series 3 xj6 with something more powerful? The stock
fans don’t seam to move a lot of air. Any help would be
much appreciated.

The stock SIII fans are perfectly adequate when the system is working
properly…:slight_smile:

…and more powerful fans will increase noise levels. The system’s
performance is more related to vent temps than air volume. Part of this is
that as the air speed increases, system air is spending less time in the
evaporator and heater matrix to be cooled or heated. And the capacity of
these items is not unlimited - even when cooling/heating to their proper
capacity…:slight_smile:

The Delanair II serves most of us well, and a plain replacement is
‘simple’ - but whatever you like…

Frank
xj6 85 Sov Europe (UK/NZ)-----Original Message-----
From: Jhillzoom
Sent: Tuesday, March 22, 2016 10:59 PM
To: xj@jag-lovers.org
Subject: [xj] Heater fan upgrade

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The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Frank sent Tue 22 Mar 2016:

Frank

You are absolutely correct on the increased wind speed
being noiser… plus that does increase the vent temps…

But, I just answered the question… the increased speed is he
helpful when the car has been sitting outside and is very ho
hot… the air moving makes the human feel ‘‘cooler’’ and the no
noise sounds like it is doing ‘‘something good’’.

It does clear the windscreen better…–
The original message included these comments:

…and more powerful fans will increase noise levels. The system’s
performance is more related to vent temps than air volume. Part of this is
that as the air speed increases, system air is spending less time in the
evaporator and heater matrix to be cooled or heated. And the capacity of


'71 XJ6 383/200R, 2015 Dodge Ram 1500 4X4 Eco Diesel
Glendora, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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In reply to a message from Frank sent Tue 22 Mar 2016:

Frank

You are absolutely correct on the increased wind speed
being noiser… plus that does increase the vent temps…

But, I just answered the question… the increased speed is he
helpful when the car has been sitting outside and is very ho
hot… the air moving makes the human feel ‘‘cooler’’ and the no
noise sounds like it is doing ‘‘something good’’.

Fair enough, Roger…

Since you have a SI and the other car is a SIII - the fan upgrade may be
more worthwhile? My original concern was that, apart from one fan not
working, that something else was causing lack of airflow. While I find my
SIII fans to be adequate - they are also intrusively noisy as is…

As an aside, in the original configuration of the SIII’s Delanaire II the
‘auto high’ fan speed was slightly lower than the manual ‘Hi’ - on later
models it was reconfigured so they both run at high. Obviously to increase
the’auto high’ speed - so they were not entirely satisfied…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)

It does clear the windscreen better…

The original message included these comments:-----Original Message-----
From: Roger Mabry
Sent: Thursday, March 24, 2016 2:52 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Heater fan upgrade

…and more powerful fans will increase noise levels. The system’s
performance is more related to vent temps than air volume. Part of this is
that as the air speed increases, system air is spending less time in the
evaporator and heater matrix to be cooled or heated. And the capacity of

===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Frank sent Tue 22 Mar 2016:

Thank you! I’m starting to think that I had one not
working before this issue and now they are both gone. Time
to dig in to the dash I guess!–
Jhillzoom
Charlotte, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Frank sent Tue 22 Mar 2016:

Thank you! I’m starting to think that I had one not
working before this issue and now they are both gone. Time
to dig in to the dash I guess!

While a single fan fault is likely a local fan fault, requiring access to
the fan; failure of two fans may have other causes…

Access the fan resistor unit and the relay bank to measure outputs - and
applying 12V directly to the green wire at the resistor unit bypasses all
controls, powering the fans directly. And the fuses and fuse holder should
be checked as a matter of routine…

It’s highly unusual for both fans to fail, which raises the question of how
you verified, initially that one fan was not running. As said previously,
lack of air speed may have a variety of reasons unrelated to the fans. Fans
are not easily accessible - and it is advisable to eliminate other
possibilities first. Whic requires ome fairly easy testing…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)-----Original Message-----
From: Jhillzoom
Sent: Monday, March 28, 2016 1:49 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Heater fan upgrade

===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Frank sent Mon 28 Mar 2016:

Resistance may be the issue with the drivers side fan but
the passenger side sounds like physical damage. It’s not
that it’s not coming on or changing speeds so much as it
sounds like a coffee can filled with bolts!–
Jhillzoom
Charlotte, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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In reply to a message from Frank sent Mon 28 Mar 2016:

Resistance may be the issue with the drivers side fan but
the passenger side sounds like physical damage. It’s not
that it’s not coming on or changing speeds so much as it
sounds like a coffee can filled with bolts!

Which certainly is improper…:slight_smile:

…and does require access to the motor - it may be a loose bearing causing
the fan blades to interfere with the cage. Or debris in the shroud.

The point of accessing the resistor unit is only for diagnosis; it’s the
junction unit between the relay pack and the motors - and responsible for
fan speed variations…

Frank-----Original Message-----
From: Jhillzoom
Sent: Monday, March 28, 2016 10:01 PM
To: xj@jag-lovers.org
Subject: Re: [xj] Heater fan upgrade

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The archives and FAQ will answer many queries on the XJ series…
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brining this back from the dead!
i am wanting to upgrade my S1 blower fans.
i found the motor and fans mentioned above, albeit with different Fasco P/Ns
just a quick dumb question
Does the drivers side get the C.W. rotation fan and passenger CCW?
thx