The 75 and ZT Owners Club Forums - View Single Post - Hot air fine when moving, but cool stationary?

thanos.m · 3rd November 2021, 17:37

Just a couple of pointers from me besides an airlock.

If you suspect that some sort of radweld was used the Rover 75 heater matrix is known to be prone to blockages so one thing to check is have your heat on and feel with your hand then temperature of the air and move from the drivers side to the passengers If the air is getting progressively colder towards the passenger side your heater matrix will most likely be blocked.

Also I'll agree with Simon your car seems to be running cold it should be around 95C° I've had a similar problem and I think a few members of the forum have pointed out that replacement thermostats as of late seem to make cars run cold. I went through 3 thermostat last year because I had a cold running issue. The second one made my car run at about 78-82C° similar to yours and my heater performance was appalling.

3rd November 2021, 17:37	#12
thanos.m Avid contributor Rover 75 saloon Join Date: May 2019 Location: West Sussex Posts: 226 Thanks: 54 Thanked 41 Times in 26 Posts	Just a couple of pointers from me besides an airlock. If you suspect that some sort of radweld was used the Rover 75 heater matrix is known to be prone to blockages so one thing to check is have your heat on and feel with your hand then temperature of the air and move from the drivers side to the passengers If the air is getting progressively colder towards the passenger side your heater matrix will most likely be blocked. Also I'll agree with Simon your car seems to be running cold it should be around 95C° I've had a similar problem and I think a few members of the forum have pointed out that replacement thermostats as of late seem to make cars run cold. I went through 3 thermostat last year because I had a cold running issue. The second one made my car run at about 78-82C° similar to yours and my heater performance was appalling. Last edited by thanos.m; 3rd November 2021 at 21:41..