Adv3nture Posted Wednesday at 08:42 AM Share Posted Wednesday at 08:42 AM Last weekend, I drove my rover up a mountain, and the expansion tank fractured. There seems to be pressure in the coolant. Is the head gasket unequivocally failing? No water present in oil or the reverse. I reassembled the expansion tank, applied head gasket sealer, and bled the system. I drove it for 60 miles thereafter; towards the end, the adhesive began to deteriorate on the expansion tank repair, and coolant was leaking from the fracture in the tank once again. It operated smoothly. I have purchased a new expansion tank. Is it possible that I have temporarily resolved the problem, or may there be other factors causing the overheating other from the head gasket? Link to comment Share on other sites More sharing options...
Tearcarl Posted Wednesday at 08:43 AM Share Posted Wednesday at 08:43 AM Are you indicating that it continues to overheat? Link to comment Share on other sites More sharing options...
Adv3nture Posted Wednesday at 08:43 AM Author Share Posted Wednesday at 08:43 AM It did not overheat after my temporary repair on the expansion tank. Nevertheless, I used the heater at maximum capacity for the duration of 60 miles. The temperature was very high, although it is summer. The temperature gauge remained at the midpoint. Link to comment Share on other sites More sharing options...
Bedelon Posted Wednesday at 08:43 AM Share Posted Wednesday at 08:43 AM Do you see the prominent 110 kPa marking on your cap?Indeed, the system consistently experiences pressure upon warm-up, resulting in frequent cracking of expansion tanks. You resorted to extreme measures by applying head gasket sealer.Offer a prayer for your heater core. Remove all fluids, including the block drain cap, at this stage. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted Wednesday at 08:44 AM Share Posted Wednesday at 08:44 AM I find no indication of the specific year you reference, save from the 4.4L engine, hence I will surmise it is from 2003 to 2005. I have changed the expansion tank on my 2003 many times; the plastic welds at the seams deteriorate with time and leak independently of any cooling system malfunction. If you have not replaced your expansion tank, it is likely that you have had it for less than ten years. If you own it, the tank is overdue for leakage and requires replacement. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted Wednesday at 08:44 AM Share Posted Wednesday at 08:44 AM Identical - 100%. Completely expel the leak sealer from the system, including the heater circuits, and refill with a mixture of 50% new distilled or purified water and 50% the appropriate (blue) BMW or Pentosin NF coolant to restore functionality. It is important to note that the plastic quick disconnect connectors at the ends of the coolant hoses are likewise deteriorated and likely to break, perhaps causing overheating at the most inopportune moment and location. Furthermore, if the original radiator remains installed, it is quite likely that the lower circuits are obstructed, therefore it would be prudent to replace the radiator as well. The gearbox cooler is connected to the radiator, with the bottom section of the radiator used to cool the gearbox cooler. Link to comment Share on other sites More sharing options...
Bedelon Posted Wednesday at 08:45 AM Share Posted Wednesday at 08:45 AM All AJ engines use Havoline XLC (Dexcool) coolant. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted Wednesday at 08:45 AM Share Posted Wednesday at 08:45 AM I was speculating on the 4.4 M62 engine. Wasn't the Jaguar engine from 2006 to 2009 a 4.2L? My 2012 AJ133s (5.0L) do not use Dexcool (Orange, Valvoline brand); I employ Pentosin SF (OEM Pink). Valvoline also produces a "purple" alternative known as Zerex. If this pertains to the Jag engine, please dismiss my comments; it is just relevant to the 2003 - 2005 L322. Link to comment Share on other sites More sharing options...
Notef Posted Wednesday at 08:45 AM Share Posted Wednesday at 08:45 AM Ensure the coolant cap is replaced with the new tank. You may also do a hydrocarbon test in advance using a Block Tester from NAPA. This will detect hydrocarbons in the coolant; if present, it indicates a leak in the head gaskets. Link to comment Share on other sites More sharing options...
Adv3nture Posted Wednesday at 08:46 AM Author Share Posted Wednesday at 08:46 AM I purged the whole system. Replaced the coolant reservoir along with a new top. Regrettably, I am now seeing significant pressurised steam emanating from the bleed valve located atop the engine. I am unable to stop it, thus I guess it is exhaust gases. I believe the high-gain sensors are compromised, which caused the coolant tank to rupture first. Strangely, the temperature gauge is functioning normally. Could this maybe be the consequence of a clogged thermostat in the lower hose exiting the radiator? I believe that is only optimistic speculation. It may be time to consider acquiring another economical 2006 Range Rover 4.4 HSE 4.4L. It would not be worthwhile to hire a business for this task, and I am apprehensive about the magnitude of the project to be completed on weekends. Link to comment Share on other sites More sharing options...
Notef Posted Wednesday at 08:46 AM Share Posted Wednesday at 08:46 AM If the system pressure is excessive, the cap will release pressure.Simply operate the vehicle. Monitor coolant temperatures using a scanner; they should generally remain below 100°C. Link to comment Share on other sites More sharing options...
Adv3nture Posted Wednesday at 08:47 AM Author Share Posted Wednesday at 08:47 AM I am unable to get any heat from the car's fan heater. Steam is emanating from the heater pipes. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted Wednesday at 08:47 AM Share Posted Wednesday at 08:47 AM Amazon BT-500 Head Gasket Combustion Leak Test Kit Link to comment Share on other sites More sharing options...
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