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Jaguar XJ40 1988

lagi70
Posts: 6
Joined: Thu Apr 19, 2018 1:28 am

Re: Jaguar XJ40 1988

Postby lagi70 » Thu Aug 29, 2019 2:04 am

Hi Naki

On hot days if I run the air conditioner the temperature creeps up, then I start to panic and have to turn it off. I am running an aftermarket Nissen radiator as I had to replace the original because the plastic pipe at the top broke, and I am wondering if its too much having all these ancillaries needed to be cooled down by just the radiator alone. I can get a cooler such as this from a wreckers and try it just need to find the time. The issue is that we have extreme temperatures in South Australia during summer and I just don't feel the factory setup is sufficient especially with 30 year old vehicles.
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naki_k
Super Moderator
Posts: 28673
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Jaguar XJ40 1988

Postby naki_k » Sat Aug 31, 2019 9:57 am

Ok, I see. Clearly any rise on indicated coolant temp past normal is not good.
I assume you have checked/ replaced the thermostat to make sure it’s opening all the way?
Are you certain the water pump is working well/ radiator not restricted/ blocked?
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

xjr40
Posts: 1695
Joined: Sun Jul 01, 2012 6:18 pm
Location: Canary Islands, Spain

Re: Jaguar XJ40 1988

Postby xjr40 » Sat Aug 31, 2019 1:37 pm

naki_k wrote:Ok, I see. Clearly any rise on indicated coolant temp past normal is not good.
I assume you have checked/ replaced the thermostat to make sure it’s opening all the way?
Are you certain the water pump is working well/ radiator not restricted/ blocked?


Those flushing machines do a great job. They leave the whole system spot on but I'm not sure if they can cause wear on components maybe. I had a Fiat that kept on turning the new coolant brown until it had a good flushing that kept it clean for good.
1991 Jaguarsport XJR 4.0
One of 83 manual - 65 LHD
Regency - Magnolia
Previous 1989 XJ40 2.9 auto (3.6)

Big T-Rev
Posts: 12
Joined: Thu Mar 14, 2019 12:38 pm
Location: Rockingham, Western Australia

Re: Jaguar XJ40 1988

Postby Big T-Rev » Sun Sep 01, 2019 10:39 am

Hi there,
just as a comparison, I find that I have no problems with temp running my vehicle here in Perth (West Australia) even on the hottest of days. My vehicle is stock standard. I suggest you try to get a standard radiator and install that rather than experimenting with other arrangements. As Naki has pointed out these vehicles were extensively tested in hot climates during development and should handle it.
1990 XJ40 Sovereign Silver 4L Auto VIN 599296

Previous:
1998 Range Rover P38 HSE
2000 Holden Jackaroo 4WD
2001 Subaru WRX 2L
1992 Range Rover 4D 4.4L
1980 Range Rover 2D 3.5L
1984 Range Rover 4D 3.5L
1966 Morris Cooper 998 sedan
1978 Range Rover 2D 3.5L
1971 Ford Falcon XY 5.7L
1970 Holden Panel Van 3.3L

naki_k
Super Moderator
Posts: 28673
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Jaguar XJ40 1988

Postby naki_k » Sun Sep 01, 2019 5:34 pm

Even something as simple as a build up a leafs/ dirt/ debris between the Condenser and Radiator, can be enough to restrict air flow through the rad. Get them apart for a peep in between.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300