1.Feb.2014
Changing Front Lower Control Arm
11.Nov.2013
10.Nov.2013
24.July.2013
14.Mar.2013
Changing Rear Anti-RollBar Bushes
13.Mar.2013
Dipped (low) Beam Bulb Replacement
25.Feb.2013
MAF Sensor Repair or Replacement
15.Feb.2013
Front Brake Disc(Rotor) Replacement
30.Jan.2013
26.Nov.2012
24.June.2012
UK Insurance Group Ratings Added
14.June.2012
Diesel Vehicle Service Sheet Added
14.June.2012
Petrol Vehicle Service Sheet Added
22.Jan.2012
23.Oct.2011
Checking Antifreeze Electrolysis
Checking the quality of the antifreeze is one of the jobs that really should be done if you have recently purchased the vehicle. It is obviously important to check the PH but with a recently purchased vehicle it is also worthwhile checking the 'charge' of the Antifreeze, this is a simple but generally overlooked process, allow about 10-15 minutes to complete the check.
Equipment and Tools Required:-
The Jaguar service schedule recommends a change of the engine coolant every 5 years, however maintaining the effectiveness of the coolant is important. Incorrect or poor quality antifreeze, not using distilled water, or an electrical problem, can result in the fluid building up an electrolytic charge. This charge can result in substantial damage to soft metal engine components within the cooling system.
Method
Checking the electrolytic charge of the coolant is not difficult and requires only basic knowledge of the use of a standard multi meter. Run the vehicle until the engine reaches normal operational temperature, then shut it off. Allow a few minutes for the pressure in the system to reduce, then using a cloth remove the cap of the coolant reservoir by unscrewing it until it rotates freely then pulling upwards.

Switch the multi meter to DC Volts and place the Positive (Red) lead of the multi meter into the coolant expansion tank ensuring that it is well submerged into the coolant. Connect the Negative (Black) lead to the engine or ideally the negative terminal of the battery.

Measurement
You are looking for a voltage reading below 0.050V DC a reading above 0.150 VDC would be a cause for concern and would suggest that a full flush and replacement of the coolant is required.

A reading slightly above 0.05V DC would suggest that the coolant fluid requires changing. The actual reading limits are not set in stone, with varying levels deemed acceptable by different vehicle manufacturers, it's worth remembering however that it should be zero and the higher the voltage the greater the likelihood of damage.
Causes of Electrolysis
The main cause of Electrolysis is lack of maintenance by not changing the antifreeze on a regular basis, but can also be due to chemical imbalance is caused by:-- Not using distilled water.
- Not having at least a 50/50 mix of antifreeze and water.
- Using recycled antifreeze.
- Poor clean and flush of old coolant
- Using poor quality antifreeze that does not meet the manuafacturers specifications.
- Using coolant flush chemicals that are acid based.