In reply to a message from Omarro sent Wed 5 Jan 2005:
On your '91 (assuming that the spec is similar to my UK version),
they did not fit the coolant cut-off valve to the heater matrix
which is designed to shut off the coolant flow whenever Aircon is
selected - so it can’t be that that is stuck closed.
Having got that possibility out of the way, have you checked that
you actually have coolant flow through the heater matrix in the
climate control unit (CCU)? When the engine is up to normal
operating temperature, feel the heater pipes that pass through the
left side of the firewall in the engine bay - both should be hot.
If they are not, suspect that the heater matrix is blocked and
remove both pipes to flush it through with water in an attempt to
clear the blockage.
If that is OK, select ‘manual’ mode on the A/C panel and ‘Defrost’
on the fan speed control. Check if a) you get air out of the demist
vents under the screen, b) that the air is HOT and c) that you get
NO air from the footwell vents.
If you get air out of the footwell vents in ‘Defrost’ the lower
blend flap is stuck and if that air is COLD, it’s stuck in
the ‘Full Cold’ position.
If the air from the demist vents is cold when ‘Defrost’ is
selected, the upper blend flap in the CCU is stuck in the ‘Full
Try those things first and report back when we may be able to give
you further advice.
On the question of the ‘Brake’ warning of ‘Fail’ and ‘Fluid’ -
check the level of the brake fluid in the reservoir - it’s telling
you that it’s low.
Turn on the ignition without starting the engine. Wait until the
Teves brake booster electric pump stops running. do you still have
the brake warning light on? Turn off the ignition. How many
applications of the brake can you make before the brake pedal ‘goes
hard’ (i.e. all servo assistance is lost.
Report back with that too.–
The original message included these comments:
This is my first posting and my first Jaguar I have a 1991 Baseline
model. I can’t figure out why the heater does not get the car warm
or hot. The vents are working and the engine warms to the center
line, no problems with the A/C. Also the brake light stays on with
VCM message ‘‘Fluid’’ and ‘‘Fail’’ not sure about this, because rotors
and pads are pretty new? Any tips or advice would be great
considering I’m in Minnesota the heat is a concern.
Bryan N ('91 Sovereign 4.0 L)
Cambridge, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !