GEOFFREY   MILLER
       
 

Home

 
 

Sitemap

 
 

Range Rover

 
   

Advertisement

 
   

Engine

 
   

Cooling system

 
   

Electrical system

 
   

Ignition system

 
   

Instruments

 
   

Manual Gearbox

 
   

Automatic Gearbox

 
   

Transfer Box

 
   

Air Bags

 
   

Air Suspension

 
   

Steering

 
   

Hubs

 
   

Swivels

 
   

Helicoils

 
   

Headlining

 
   

Tailgate

 
 

Video

 
 

Psion Organiser II

 
 

Flymo LT1236 mower

 
  Links  
     
 

Range Rover pages

Cooling System

 
     
 

The Range Rover Classic cooling system is a standard water-cooled type

Radiator

This is of lead-soldered brass construction, with the tubes running horizontally between two tanks (hot on the left, cold on the right side of the vehicle).


The movement of the engine under load (in the opposite direction to rotation of the crankshaft) applies a twisting motion to the radiator via the hoses causing it to "lozenge", which in turn can often lead to failure of the lead-soldered joints. My radiator has required one repair and one re-build for this reason.

Beware, there are different radiators for vehicles with and without air conditioning.


Thermostat

This is a standard "waxstat" type, mounted in the inlet manifold waterway, under the fitting to which the radiator top hose is attached. The thermostat can fail, as mine did. In the picture you can see the scuff marks on the copper part, where it was sticking

thermostat

When tested, by boiling it up in a saucepan of water, it began to open at the correct temperature of 88 deg C, but because of the sticking it didn't open fully until 100 deg C. This proved to be the cause of the engine running hot, with the temperature gauge needle well into the top half of the scale. It was cured by replacing the thermostat, after which the temperature gauge needle was in the middle.

(you can also see that the white plastic jiggle-pin has turned green after 21 years immersion in Unipart antifreeze, which contains fluorescein!)


Loss of coolant

This may be a symptom of head gasket failure.

Other causes may include:-

weak pressure spring in radiator cap
leaking radiator or hoses
water pump failure

The Rover V8 engine, particularly in it's larger capacity variants as used in the P38A, is prone to cracking of the block and loosening of the cylinder lining. It has been suggested that this is due to the fuel mapping, designed for economy and emissions, giving too weak a mixture at low revs with full throttle, leading to overheating.

Read more