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Range rover thermostat

Mechanic replaced lower hose that was cracked...He's saying he thinks it a head..Has ordered thermostat BUT HAS YET NOT PUT IT ON...Car he say's over heats after about 10min?

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  • Cars & Trucks Master
  • 5,280 Answers

I would agree. Trying a new thermostat is standard procedure to try and stop overheating, before getting into more expensive options. Thermostats can get stuck and not open fully, restricting circulation of coolant.

Posted on Jul 17, 2013

  • ALBERT Jul 20, 2013

    Thanks for your response...Why are these dam p38's so hard to bleed?lol..I read 1 person,it took about 7 days to finally get air out...I still think all this over heating mysteriously started last week when that winding/whistling sound started in the engine compartment...My mechanic&his assistant debated whether it was a COMPRESSOR cuz i have no AC blowing cold right now...The heat blows fine...Or they said it was the power steering pump...I said maybe"WATER PUMP"...Another assistant came up&agreed with water pump...He Told me to drive it,its plenty of powersteering fluid in you'll be fine till Friday when he gets back from 3 day vacation...Next day while moving from a storage unit,a lady told me whats wrong with your range rover?Is your water pump going bad?The winding noise got really loud thru the day...She said,that sound was the water pump when here grand prix had problems...And she said,she knows that sound...I kept driving...Next day the car over heated on the highway..Cracked hose has been changed,thermostat replaced...Only thing has not been addressed yet is"THE WATER PUMP"...My mechanic is still trying to bleed air out...Or saying he's 90%sure its a head casket!i

  • montehammons Jul 20, 2013

    Well, your mechanic may not be very smart. Don't let him do expensive head gasket work without testing to verify that. I would agree with that lady, probably the water pump. The power steering and the compressor can be isolated to see if they cause the noise-by temporarily removing the belts that run them.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 30 Answers

SOURCE: coolant doesn't heat up!

the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

Posted on Nov 24, 2008

j_del
  • 1586 Answers

SOURCE: car doesn't warm up

It does sound like the thermostat. The sensor does not control the thermostat in any way, it only reads the temperature of the coolant. Your symptoms are classic of a thermostat that is stuck open or partially open. Take it back and tell them what is going on and have them show you that the thermostat is fine.

Posted on Nov 24, 2008

  • 1596 Answers

SOURCE: I replaced the alternator on my 2003 Range Rover

I Suspect that you have AIR in your COOLING SYSTEM Fallow Procedures BELOW to Insure there is NO AIR IN COOLING SYSTEM


Draining and Filling Cooling System

Draining Procedure

Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system. Drain and refill the engine cooling system every 5 years or 240,000 km, (150,000 mi) , whichever occurs first.

  1. Park the vehicle on a level surface.
  2. Remove and clean the coolant recovery reservoir.
Caution: Refer to Radiator Cap Removal Caution in Service Precautions.

  1. Remove the radiator cap when the engine is cool:
3.1. Slowly rotate the cap counterclockwise to the detention tab. Do not press down while rotating pressure cap. 3.2. Wait until any residual pressure, indicated by a hissing sound, is relieved. 3.3. After all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap.
Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do NOT pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound.

  1. Place a drain pan under the radiator drain valve in order to collect all of the used coolant.
  2. Open the radiator drain valve located at the bottom of the radiator tank. If only partial cooling system draining is required, drain enough coolant to perform the procedure.
  3. Open the air bleed valve on the thermostat housing 2 full turns
    1. Open the air bleed valve above coolant pump 2 full turns.
    2. Place a drain pan under the engine block drains in order to collect the used coolant.Important: Allow the coolant to drain completely.

      1. Remove both of the engine block drains.
        • The front left engine block drain is located between the starter motor and the engine oil filter.
        • The rear right engine block drain is located near the crankshaft position sensor.
      Filling Procedure
      Reinstall the engine block drains
    3. Close the radiator drain valve,
      1. Install the coolant recovery reservoir. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant. If Coolant other than DEX-COOL or HAVOLINE DEX-COOL is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.
      2. Slowly add a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.
      3. Wait for 2 minutes and reinspect the level of the coolant in the radiator. If necessary, add coolant to the radiator until the coolant level is at the base of the radiator fill neck.
      4. Install the radiator cap.Ensure that the radiator cap arrow points toward the radiator overflow tubeImportant: The air bleed valves are brass. Do NOT over-tighten the air bleed valves.

        1. Close the air bleed valve above the coolant pump.
          1. Close the air bleed valve on the thermostat housing.
          2. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water. Caution: Refer to Radiator Cap Removal Caution in Service Precautions. Important: If the coolant temperature indicator turns ON, turn the engine OFF immediately and allow the engine to cool. Do NOT remove the radiator cap.
          3. Start the engine and allow the engine cooling fan to cycle on and off 3 times. If the low coolant indicator does not turn OFF and the coolant level is above the Full Cold mark on the coolant recovery reservoir, refer to Engine Coolant Temperature Gage Inaccurate or Inoperative.
          4. Turn off the ignition.
          5. Allow the engine to cool.
          6. Ensure that the engine coolant concentration is sufficient.

Posted on Feb 21, 2009

  • 36 Answers

SOURCE: heating problem

If you changed the thermostat yourself and have noted that the lower radiator hose is cooler than the upper radiator hose, you may have installed the thermostat incorrectly or have purchased a faulty thermostat. A lower radiator hose that does not get hot (or as hot as the upper radiator hose) is a direct indication of a faulty thermostat. Please vote for this solution if you found this to be helpful. Thanks,

Posted on Jun 01, 2009

SOURCE: my 2004 elantra overheated, the radiator cracked,

did you check the cooling fan its work ? did you bleed the colling sistem & to add a new antifreeze maybe you have a problem in the temp sensor o wires of the sistem

Posted on Jul 16, 2009

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1995 range rover p38 4.6 litre petrol over heating ive fitted a new thermostat and the radiator is clear but the bottom hose doesnt get very hot and the lefthand side heater doesnt work can you diagno


Sounds blocked to me, with the limited info provided that is. Here's a couple often overlooked things to check if you havnt already: 1.The resorvoir cap located on top of the coolant tank behind battery. This is a critical item and must operate correctly. They do get worn and can malfunction and as with the thermo once overheated they need to be replaced. 2. The line from the top of the radiator that wraps the inside fender and up to the neck of the resorvoir. If you disconnect from resorvoir with engine running (but cool) you should have a steady flow of coolant. If its intermittent or weak this would indicate partial blockage. 3. The thermostat replacement, was it done by a qualified tech? This is the "artificial heart" looking junction down near the battery side of lower radiator. Because the engine block is a GM design it is cast to accomodate the thermo at the top of the engine as with a GM car. Rover does not use this and it is a clear passage from top hose to top end. It is not unheard of for an unfamliar tech to install a thermo here thinking the old was simply removed. Also the hoses may be connected to the wrong ports. Two of the three are the same size, check it out, your "heart" may be in backwards.
They seem like minor items but they are critical to the high pressure cooling system unique to Range Rover. Hope this helps you are on the right track. Whatever you do don't let it overheat to the red. It doesn't sound like a head gasket but the coolant isn't blending for one reason or another. Hope it helps, am happy to troubleshoot further if you post additional info.

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1 Answer

Could it be thermostat


Not much we can do online about the mechanic. The hose probably blew when the engine overheated, so he would need to replace it to test the cooling system. And yes the thermostat would be tested or replaced before removing the heads.
Be sure and get a second opinion if his final diagnosis is a blown head gasket. He may be right, but better to be sure.

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Damp passenger floor sounds like a heater core. What a pain in the a__. Most probably the dash has to come out to replace. That is the only thing I know of that circulates engine coolant into the passenger compartment.
If you confirm this and want to fix it on the cheap, you can put a crossover hose in the engine compartment and bypass the heater core entirely. This is a $5 fix that works perfectly, mechanically speaking. Unfortunately, you will have no heat. Of course, you may decide that is a better option once you hear a quote on getting the heater core replaced.
Oh yeah, get a new mechanic.

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I don't understand what you mean when you say that you have bypassed the thermostat because it is impossible to do, by what you are saying I think that the thermostat is'nt opening up &needs to be replaced ( are you know what & where the thermostat is)....hope this helps........cheers.

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1- Bad Thermostat is not opening at pre-determine temperature. 2- Bad water pump not turning as the belt driving. 3- Bad radiator is clogging up causing coolant stagnant even good thermostat and good water pump
Since you don't have heater, there maybe a serious problem of no coolant in the loop due to a blown head gasket. What happens is that due to the blown head gasket, coolant gets through the oil path from water jacket, so the coolant level is low not at the coolant hose level for heater core to receive the coolant. There is no coolant flowing through the heater core or heater matrix, hence there is no heater.
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