Prelude to 1992 XJ40 Sovereign Overheat?
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Prelude to 1992 XJ40 Sovereign Overheat?
Hoping someone can point me in the most important direction, to prevent
an possible impending overheat on my 1992 XJ40 Sovereign.
Things I've noticed, which may or may not be related:
1) Coolant Resevoir gets very hot to the touch after driving.
2) Plastic Driver's side Hood lift arm is getting tacky/sticky,
obviously starting to melt under extensive heat, but nothing
else nearby looks heat affected. Hood lift arm on passenger
side looks perfectly normal.
3) Coolant level light intermittantly comes one when driving
on the freeway, but levels seem fine when checked later.
4) Temperature gauge never goes into the Danger Zone.
5) Sometimes when I start the car up, the transmission light
stays lit -- so I turn it off, and restart. The light then stays
off, but the car operates normally, and does not enter Limp
Home Mode.
5) The Electric Cooling Fan up front does not seem to
operate when the car is idling, neither hot nor cold.
[Replaced the Cooling Fan relay, but didn't seem to have
any effect.]
I'd appreciate any assistance. Thank you!
an possible impending overheat on my 1992 XJ40 Sovereign.
Things I've noticed, which may or may not be related:
1) Coolant Resevoir gets very hot to the touch after driving.
2) Plastic Driver's side Hood lift arm is getting tacky/sticky,
obviously starting to melt under extensive heat, but nothing
else nearby looks heat affected. Hood lift arm on passenger
side looks perfectly normal.
3) Coolant level light intermittantly comes one when driving
on the freeway, but levels seem fine when checked later.
4) Temperature gauge never goes into the Danger Zone.
5) Sometimes when I start the car up, the transmission light
stays lit -- so I turn it off, and restart. The light then stays
off, but the car operates normally, and does not enter Limp
Home Mode.
5) The Electric Cooling Fan up front does not seem to
operate when the car is idling, neither hot nor cold.
[Replaced the Cooling Fan relay, but didn't seem to have
any effect.]
I'd appreciate any assistance. Thank you!
Last edited by nimtene; Jun 5, 2009 at 08:38 PM.
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Joined: Nov 2008
Posts: 855
Likes: 6
From: McHenry IL
1. That should happen hot coolant circulates in the system and will cause it to heat up and it's soaking up heat from the engine.
2. You sure the hood strut didn't blow a seal and is leaking it's oil?
3. Could be a faulty sensor on the coolant level. Mine hasn't worked since I got the Jag it's on the to-do list.
4. That's a good thing
5. That has nothing to do with overheating
6. Try putting 12 volts directly to the fan to make sure it's not a bad electric motor. Come to think of it mine generally only comes on with the a/c running. It might be a additional air mover specifically for that.
2. You sure the hood strut didn't blow a seal and is leaking it's oil?
3. Could be a faulty sensor on the coolant level. Mine hasn't worked since I got the Jag it's on the to-do list.
4. That's a good thing
5. That has nothing to do with overheating
6. Try putting 12 volts directly to the fan to make sure it's not a bad electric motor. Come to think of it mine generally only comes on with the a/c running. It might be a additional air mover specifically for that.
Last edited by ArmyJag; Jun 6, 2009 at 10:01 AM.
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Thanks for the thorough respone!
2. You sure the hood strut didn't blow a seal and is leaking it's oil?
Ah! On second glance, you're right. Thank you!
3. Could be a faulty sensor on the coolant level.
I checked out the coolant sensor. Any idea exactly how these work?
After I pull the sensor out of the hole, it's completely dry deep down
into the sensor hole. Is coolant supposed to flow through the sensor
hole?
6. Try putting 12 volts directly to the fan to make sure it's not a bad electric motor.
Hmm, I traced the wire from the motor back about a foot and a half, and see
a blue plastic plug that isn't connected to anything else. This is odd, I'm not
seeing an empty matching plug where this should plug into.
2. You sure the hood strut didn't blow a seal and is leaking it's oil?
Ah! On second glance, you're right. Thank you!
3. Could be a faulty sensor on the coolant level.
I checked out the coolant sensor. Any idea exactly how these work?
After I pull the sensor out of the hole, it's completely dry deep down
into the sensor hole. Is coolant supposed to flow through the sensor
hole?
6. Try putting 12 volts directly to the fan to make sure it's not a bad electric motor.
Hmm, I traced the wire from the motor back about a foot and a half, and see
a blue plastic plug that isn't connected to anything else. This is odd, I'm not
seeing an empty matching plug where this should plug into.
Last edited by nimtene; Jun 8, 2009 at 10:59 PM.
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Joined: Mar 2010
Posts: 31
Likes: 0
cooling fan runs constant,ac will only operate w/econ switch NOT lit up.
w/out econ lit car will cool but when econ lite is off[when button is not pressed]
only heat will be able to be used w/econ buttonlit up as this controls ac compressors function[read manual under cooling]
good luck !
w/out econ lit car will cool but when econ lite is off[when button is not pressed]
only heat will be able to be used w/econ buttonlit up as this controls ac compressors function[read manual under cooling]
good luck !
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