My Diesel 75 is loosing coolant

alanaslan · 26th July 2018, 19:03

The other day having paid for my fuel hobbling back to the car on my sticks I saw a disturbing pink run of water on the ground under the car.
Upon getting home things had got a bit hot well 104 degrees, I cracked open the header tank and let things cool after twenty mins I topped the car up with water and bleed the cooling system.
Then ran the car with the pressure cap off till she was warm 92 degrees. Then put a pressure cap on top of the expansion tank and pumped the system up to 22 psi.
Two hours later she was still sitting at 22 psi.
Any suggestions anyone the puddle under the garage forecourt and the engine overheating along with the car taking just over two litres of coolant, I would have said proves there is a coolant leek.
However the pressure test when hot suggests that with no pressure drop there is no problem.
I need help with this one? Has anybody come across this problem before.
Alan

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NigelOBB · 26th July 2018, 19:13

Check the thermostat housing, and top rad hose y splitter on engine block

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alanaslan · 26th July 2018, 19:55

Quote:

Originally Posted by NigelOBB

Check the thermostat housing, and top rad hose y splitter on engine block

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Stat housing replaced last October and properly fitted no leaks with stat closed or with stat open .
The Radiator hoses were replaced in October also as they were showing outward signs of old age also did the turbo hoses at the same time.
Alan

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Ian G · 26th July 2018, 19:59

Check the plastic outlets on the radiator I've know them to crack before.
Cheers

NigelOBB · 26th July 2018, 20:00

The seal on the thermostat went on mine, and the y splitter cracked and eventually failed. Couldn’t tell until it blew big style. Diesels very rarely suffer from hgf. They can leak at the heater matrix to and the branch feeding from engine to the matrix.

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alanaslan · 26th July 2018, 20:04

Quote:

Originally Posted by alanaslan

The other day having paid for my fuel hobbling back to the car on my sticks I saw a disturbing pink run of water on the ground under the car.
Upon getting home things had got a bit hot well 104 degrees, I cracked open the header tank and let things cool after twenty mins I topped the car up with water and bleed the cooling system.
Then ran the car with the pressure cap off till she was warm 92 degrees. Then put a pressure cap on top of the expansion tank and pumped the system up to 22 psi.
Two hours later she was still sitting at 22 psi.
Any suggestions anyone the puddle under the garage forecourt and the engine overheating along with the car taking just over two litres of coolant, I would have said proves there is a coolant leek.
However the pressure test when hot suggests that with no pressure drop there is no problem.
I need help with this one? Has anybody come across this problem before.
Alan

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I have just checked the cars own expansion tanks pressure cap in the lathe between two centres, it is very slightly distorted but less than 1mm. This now raises the question should I be fitting a new pressure cap or a new pressure cap and expansion tank.
I’ll buy a new cap to start with to see what it is like between centres, before fitting to the existing tank. I have to say I would have expected the rubber o ring to have taken that amount of play up.
Alan

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Rover 75 Tourer · 26th July 2018, 21:15

Water leak on my 54 plate diesel was caused by the upper heater hose chaffing against the N/Side under corner of the air filter housing

Jules · 26th July 2018, 22:56

Quote:

Originally Posted by alanaslan

Stat housing replaced last October and properly fitted no leaks with stat closed or with stat open .
The Radiator hoses were replaced in October also as they were showing outward signs of old age also did the turbo hoses at the same time.
Alan

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Did you replace the heater pipe O ring?

alanaslan · 27th July 2018, 03:35

Quote:

Originally Posted by Jules

Did you replace the heater pipe O ring?

Thanks yes heater “o” ring replaced in October also, This one has me very confused.
Does any body know the normal operating pressure of the system with stat open. I think I will try pumping her up to normal operating pressure. And leave her overnight in the workshop and see if I have any pressure loss in the system.
Alan

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75c · 27th July 2018, 08:30

When I was a derv driver I had a problem with coolant loss. I spent a lot of time and money trying to get to the bottom of it (I have no mechanical skills) before finally buying a new coolant cap. The new coolant cap solved the problem. Embarrassed doesn't cover it.

26th July 2018, 19:03	#1
alanaslan Gets stuck in 75 Tourer Automatic conn, 75 Saloon Automatic Conn, The Monograme Spice Tourer Join Date: Jun 2014 Location: Johnstone Posts: 670 Thanks: 57 Thanked 231 Times in 151 Posts	My Diesel 75 is loosing coolant The other day having paid for my fuel hobbling back to the car on my sticks I saw a disturbing pink run of water on the ground under the car. Upon getting home things had got a bit hot well 104 degrees, I cracked open the header tank and let things cool after twenty mins I topped the car up with water and bleed the cooling system. Then ran the car with the pressure cap off till she was warm 92 degrees. Then put a pressure cap on top of the expansion tank and pumped the system up to 22 psi. Two hours later she was still sitting at 22 psi. Any suggestions anyone the puddle under the garage forecourt and the engine overheating along with the car taking just over two litres of coolant, I would have said proves there is a coolant leek. However the pressure test when hot suggests that with no pressure drop there is no problem. I need help with this one? Has anybody come across this problem before. Alan Sent from my iPad using Tapatalk

26th July 2018, 19:13	#2
NigelOBB This is my second home 04 Rover 75 Contemporary SE - 53 Rover 75 Connoisseur -94 Mercedes W140 - 72 VW Beetle 1300 Join Date: Sep 2012 Location: Sunderland Posts: 4,767 Thanks: 1,379 Thanked 493 Times in 429 Posts	Check the thermostat housing, and top rad hose y splitter on engine block Sent from my iPhone using Tapatalk __________________ [SIGPIC][/SIGPIC] Keep smiling - it makes people wonder what you've been up to.

26th July 2018, 20:00	#5
NigelOBB This is my second home 04 Rover 75 Contemporary SE - 53 Rover 75 Connoisseur -94 Mercedes W140 - 72 VW Beetle 1300 Join Date: Sep 2012 Location: Sunderland Posts: 4,767 Thanks: 1,379 Thanked 493 Times in 429 Posts	The seal on the thermostat went on mine, and the y splitter cracked and eventually failed. Couldn’t tell until it blew big style. Diesels very rarely suffer from hgf. They can leak at the heater matrix to and the branch feeding from engine to the matrix. Sent from my iPhone using Tapatalk __________________ [SIGPIC][/SIGPIC] Keep smiling - it makes people wonder what you've been up to.

26th July 2018, 21:15	#7
Rover 75 Tourer Avid contributor Rover 75 tourers(4)400turs(3 Join Date: Nov 2016 Location: Largs Posts: 219 Thanks: 3 Thanked 67 Times in 56 Posts	Diesel Dick Water leak on my 54 plate diesel was caused by the upper heater hose chaffing against the N/Side under corner of the air filter housing

26th July 2018, 19:59	#4
Ian G This is my second home Small Join Date: Feb 2010 Location: Land of the Eel Posts: 6,315 Thanks: 2,328 Thanked 2,991 Times in 1,431 Posts	Check the plastic outlets on the radiator I've know them to crack before. Cheers

27th July 2018, 08:30	#10
75c Gets stuck in Rover 75 Saloon Join Date: Feb 2018 Location: Belfast Posts: 601 Thanks: 150 Thanked 294 Times in 190 Posts	When I was a derv driver I had a problem with coolant loss. I spent a lot of time and money trying to get to the bottom of it (I have no mechanical skills) before finally buying a new coolant cap. The new coolant cap solved the problem. Embarrassed doesn't cover it.