Overheating 1.8 - Page 3

Yorkshire GOC · 8th December 2020, 12:07

They can have stubborn airlocks - now its up to you but an old trick on these engines is to open the expansion tank and open the bleed valve then blow like mightily into the expansion tank - this will force any trapped air out hopefully. Bleed Valve is to the right under the throttle body near the airbox.

Some folk are wary to do this because of blowing into the expansion tank and the risk of coolant being imbibed so be careful.

e30325itourer · 8th December 2020, 12:39

Thanks Martin will give that a try and keep you updated.

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MacRob · 8th December 2020, 12:53

Out of interest, is the heater digital or manual turn dials? Not 100% sure if the digital one on the 1.8 has the standard heater valve in the engine bay or not. If it does then this could be stuck partly open or even closed and not letting the hot water enter the matrix and push out all the air inside it. You might still get some heat with it partly open but not enough water going in to force all the air out in one bleed session. Going by your comment that the heater hose is cold during tick over but warms up slightly when revving the engine could be down to this also. Nothing to lose in trying it.

SD1too · 8th December 2020, 13:49

Quote:

Originally Posted by MacRob

Not 100% sure if the digital one on the 1.8 has the standard heater valve in the engine bay or not.

Hi Rob,

There is no water valve in the heater circuit of the 1.8, KV6 or M47R engines. Both the rotary dial and digital controls move air blending flaps to adjust the temperature. The matrix receives a full flow of hot coolant at all times.

Simon

Lovel · 8th December 2020, 14:17

Quote:

Originally Posted by e30325itourer

Hi Simon that’s the original clamp.

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That’s not original. A jubilee clip was not fitted at that place. An incorrectly tensioned jubilee clip will squash the plastic elbow over a period of time. The original clamp had a specific force when new which when the plastic of the elbow deforms over the years allows the hose to weep. Along comes heavy handed Horace and fits a jubilee clip and generally overtightens it accelerating the deformation.

Yorkshire GOC · 8th December 2020, 14:18

Quote:

Originally Posted by e30325itourer

Thanks Martin will give that a try and keep you updated.

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If you do i always have a good measure of vodka or gin to hand in case of accidents - clear alcohol is an antidote against the effects of imbibing coolant - it stops any damage to the liver - just a precaution.

trikey · 8th December 2020, 14:55

Nice pink OAT staining on that hose, I bet when it’s removed the OAT has worked it’s way into the reinforcing braids if the hose weakening it.

e30325itourer · 8th December 2020, 15:12

Martin do you complely remove bleed screw?

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Yorkshire GOC · 8th December 2020, 17:00

Yes - if you are lucky air may come out straightaway but give the expansion tank a good blow - you may lose some coolant .

I assume you are thinking airlock as you are not experiencing any coolant loss ?

e30325itourer · 8th December 2020, 18:33

Yes hoping its airlocked, but wishful thinking, just followed the full proper bleeding sequence, heaters now blowing hot, obd is 86-90 at idle have not took it out for a drive yet

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8th December 2020, 12:07	#21
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	They can have stubborn airlocks - now its up to you but an old trick on these engines is to open the expansion tank and open the bleed valve then blow like mightily into the expansion tank - this will force any trapped air out hopefully. Bleed Valve is to the right under the throttle body near the airbox. Some folk are wary to do this because of blowing into the expansion tank and the risk of coolant being imbibed so be careful. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

8th December 2020, 12:39	#22
e30325itourer Loves to post mgztt190/bmw e30 325i tourer Join Date: Sep 2015 Location: Ballyclare Posts: 316 Thanks: 50 Thanked 50 Times in 41 Posts	Thanks Martin will give that a try and keep you updated. Sent from my POT-LX1 using Tapatalk __________________ My MGZTT This vehicle was the 2,432nd ZT-T to run off the production line, out of 8,249 This vehicle was the 847th ZT-T 190 + to be made out of 1,756 This vehicle was the 100th ZT-T in Starlight Silver (code: MBB) to be made out of 1,134 Starlight Silver ZT-Ts

8th December 2020, 12:53	#23
MacRob Loves to post Rover 75 Saloon Join Date: Sep 2019 Location: Deal, Kent Posts: 264 Thanks: 44 Thanked 81 Times in 58 Posts	Out of interest, is the heater digital or manual turn dials? Not 100% sure if the digital one on the 1.8 has the standard heater valve in the engine bay or not. If it does then this could be stuck partly open or even closed and not letting the hot water enter the matrix and push out all the air inside it. You might still get some heat with it partly open but not enough water going in to force all the air out in one bleed session. Going by your comment that the heater hose is cold during tick over but warms up slightly when revving the engine could be down to this also. Nothing to lose in trying it. __________________ MG Rover South East admin

8th December 2020, 14:55	#27
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Nice pink OAT staining on that hose, I bet when it’s removed the OAT has worked it’s way into the reinforcing braids if the hose weakening it. __________________ Lest we forget..

8th December 2020, 15:12	#28
e30325itourer Loves to post mgztt190/bmw e30 325i tourer Join Date: Sep 2015 Location: Ballyclare Posts: 316 Thanks: 50 Thanked 50 Times in 41 Posts	Martin do you complely remove bleed screw? Sent from my POT-LX1 using Tapatalk __________________ My MGZTT This vehicle was the 2,432nd ZT-T to run off the production line, out of 8,249 This vehicle was the 847th ZT-T 190 + to be made out of 1,756 This vehicle was the 100th ZT-T in Starlight Silver (code: MBB) to be made out of 1,134 Starlight Silver ZT-Ts

8th December 2020, 17:00	#29
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	Yes - if you are lucky air may come out straightaway but give the expansion tank a good blow - you may lose some coolant . I assume you are thinking airlock as you are not experiencing any coolant loss ? __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

8th December 2020, 18:33	#30
e30325itourer Loves to post mgztt190/bmw e30 325i tourer Join Date: Sep 2015 Location: Ballyclare Posts: 316 Thanks: 50 Thanked 50 Times in 41 Posts	Yes hoping its airlocked, but wishful thinking, just followed the full proper bleeding sequence, heaters now blowing hot, obd is 86-90 at idle have not took it out for a drive yet Sent from my POT-LX1 using Tapatalk __________________ My MGZTT This vehicle was the 2,432nd ZT-T to run off the production line, out of 8,249 This vehicle was the 847th ZT-T 190 + to be made out of 1,756 This vehicle was the 100th ZT-T in Starlight Silver (code: MBB) to be made out of 1,134 Starlight Silver ZT-Ts