heater cold on tick over

derek v · 2nd December 2017, 19:28

My 75 heater goes cold when you slow down or on tick over. If you take a bend sharp you get cold air blowing from the heater too. Rest of the time while driving its nice and hot. Strange thing to happen

jackatesme · 2nd December 2017, 19:30

Check small wheel between centre vents is closed,maybe letting in fresh air.

LeRich · 2nd December 2017, 20:49

What's the coolant temperature doing while the car's running?

derek v · 3rd December 2017, 01:50

Quote:

Originally Posted by LeRich

What's the coolant temperature doing while the car's running?

The temperature is sitting half way. Plus the vent on the top of the dash is turned to off. Its just strange the way it goes to cold when standing at lights or just ticking over

LeRich · 3rd December 2017, 07:34

Quote:

Originally Posted by derek v

The temperature is sitting half way. Plus the vent on the top of the dash is turned to off. Its just strange the way it goes to cold when standing at lights or just ticking over

The temp gauge is useless. You need to enter the instrument pack diagnostic mode to get an accurate reading

Mike Noc · 3rd December 2017, 08:03

Quote:

Originally Posted by derek v

The temperature is sitting half way. Plus the vent on the top of the dash is turned to off. Its just strange the way it goes to cold when standing at lights or just ticking over

Could be due to a partial blockage in the heater matrix.

T-Cut · 3rd December 2017, 08:25

Something's restricting the flow rate generated by the pump. A silting-up matrix is a likely cause or possibly an air bubble inhibiting the flow at low revs. Try disconnecting the heater hoses at the firewall and back-flushing it through with a hosepipe. This may remove enough sediment to get the heater working properly.

Always ensure the antifreeze strength is maintained around 50%. Sedimentation is encouraged by poor coolant maintenance.

TC

derek v · 3rd December 2017, 08:41

Quote:

Originally Posted by T-Cut

Something's restricting the flow rate generated by the pump. A silting-up matrix is a likely cause or possibly an air bubble inhibiting the flow at low revs. Try disconnecting the heater hoses at the firewall and back-flushing it through with a hosepipe. This may remove enough sediment to get the heater working properly.

Always ensure the antifreeze strength is maintained around 50%. Sedimentation is encouraged by poor coolant maintenance.

TC

Thanks for that I'll get it in the garage in the week and have them look at it
Dek

roverbarmy · 3rd December 2017, 09:12

When you get the heater pipes off, pour some radflush into the top pipe using a funnel. Leave it to stand, then flush through. Alternatively use radflush in the rad as normal instructions, with the heater set to high and that may do the trick anyway.

2nd December 2017, 19:28	#1
derek v Loves to post Rover 75 V6 Join Date: Sep 2017 Location: Wolverhampton Posts: 271 Thanks: 51 Thanked 57 Times in 36 Posts	heater cold on tick over My 75 heater goes cold when you slow down or on tick over. If you take a bend sharp you get cold air blowing from the heater too. Rest of the time while driving its nice and hot. Strange thing to happen

2nd December 2017, 19:30	#2
jackatesme This is my second home rover 75 saloon.Renault Captur 1.5 diesel. Join Date: Mar 2013 Location: rhymney Posts: 3,661 Thanks: 2,269 Thanked 1,242 Times in 702 Posts	Check small wheel between centre vents is closed,maybe letting in fresh air. __________________ - John B signing out Maralyn was born 9th Sept 2004 14.44.48. 103,597 of 112,381 (75s) 3,021 of 4,744 Connie SE 239 of 1.685 Platinum Gold. "Maralyn": Platinum Blonde,Troublesome,Unpredictable.

2nd December 2017, 20:49	#3
LeRich Posted a thing or two Rover 75 Cont SE 1.8T Join Date: Aug 2010 Location: Cheshire Posts: 1,082 Thanks: 215 Thanked 232 Times in 178 Posts	What's the coolant temperature doing while the car's running? __________________ Rover 75 1.8T Contemporary SE Auto Starlight Silver MBB

3rd December 2017, 09:12	#9
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,055 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	When you get the heater pipes off, pour some radflush into the top pipe using a funnel. Leave it to stand, then flush through. Alternatively use radflush in the rad as normal instructions, with the heater set to high and that may do the trick anyway. __________________ Oil in my veins!

3rd December 2017, 08:25	#7
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Something's restricting the flow rate generated by the pump. A silting-up matrix is a likely cause or possibly an air bubble inhibiting the flow at low revs. Try disconnecting the heater hoses at the firewall and back-flushing it through with a hosepipe. This may remove enough sediment to get the heater working properly. Always ensure the antifreeze strength is maintained around 50%. Sedimentation is encouraged by poor coolant maintenance. TC