Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Heating issue
-
- Newbie
- Posts: 15
- Joined: Sat Feb 24, 2018 6:00 pm
Heating issue
Hi all.
Bit of advice if anyone can help!
Z4 e85 3.0. Heating blowing cold on passengers side vent. Warm on the middle vent and hot on the drivers vent. Any ideas? Local garage has had a look and wants to take the dash out to work on the problem. Thinks there may be a blockage. There are two very small coolant leaks at the thermostat and bottom of the rad. I had to top up the expansion tank. Garage advises they bled the system too.
Don't really want to accept a massive bill if this is some known issue on these cars and I can try to resolve myself.
Thx
Bit of advice if anyone can help!
Z4 e85 3.0. Heating blowing cold on passengers side vent. Warm on the middle vent and hot on the drivers vent. Any ideas? Local garage has had a look and wants to take the dash out to work on the problem. Thinks there may be a blockage. There are two very small coolant leaks at the thermostat and bottom of the rad. I had to top up the expansion tank. Garage advises they bled the system too.
Don't really want to accept a massive bill if this is some known issue on these cars and I can try to resolve myself.
Thx
- 1000rr
- Senior Member
- Posts: 1057
- Joined: Thu Oct 13, 2016 10:53 pm
Heating issue
Get the leaks sorted, change the coolant and bleed the system.
If you have leaks, you’ll have air in the system.
If you have leaks, you’ll have air in the system.
- Silverzedtom
- Senior Member
- Posts: 1478
- Joined: Sun Jan 15, 2017 8:19 pm
- Location: East Sussex
Heating issue
This. The air will be drawn in and cause problems like the ones you describe. Fix the leaks, fill and bleed and you’ll more than likely be warm once more
E85 2.5si
F55 Cooper S
F55 Cooper S
-
- Newbie
- Posts: 15
- Joined: Sat Feb 24, 2018 6:00 pm
Heating issue
Thanks both. I've heard these are a nightmare to bleed.
Would the leaks really cause the variation in temperature dependant on vent? Thought an airlock would give heat or no heat?
Is there any info on the best way to do it right?
Would the leaks really cause the variation in temperature dependant on vent? Thought an airlock would give heat or no heat?
Is there any info on the best way to do it right?
- patriot66
- Lifer
- Posts: 3478
- Joined: Sun Jan 11, 2015 2:59 am
- Location: Mawdesley, Lancashire
Heating issue
I replaced my thermostat and waterpump earlier this week and bled it afterwards whilst the front was still up on ramps. I've bled the system once before after fitting a new expansion tank. It's certainly not a nightmare. I found it very straight forward on both occassions.
I would suggest you replace your thermostat and radiator, refill with fresh coolant and bleed it correctly. Fairly certain this will cure your heater problem.
I would suggest you replace your thermostat and radiator, refill with fresh coolant and bleed it correctly. Fairly certain this will cure your heater problem.
Sterling Grey '03 2.5i SE / Infinitas Supercharger / S.M.G / Hardtop / Gloss Black 162s / Bilstein B4s / 3.0i Brakes / DLV De-Cat & Silencer / Rebuilt VANOS / Sonar 2Xcite Lights / Carbon & Alcantara Trim / M-Sport Seats / ...& Side Covers !
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Heating issue
Not sure there’s any need to replace the radiator, but an airlock sounds the most likely.
-
- Newbie
- Posts: 15
- Joined: Sun Jun 18, 2017 9:11 pm
Heating issue
I think the garage has the right idea. There is probably a sticking vent flap in the air handling system. This has been observed on other forums but the first I have seen on the Z4. You might free it up by switching from defrost to heat a few times. The foam they use to seal the flaps can become sticky.
04 Z4 3.0i MT
06 XK8 Conv.
06 XK8 Conv.
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Heating issue
The flaps are servo driven so have quite a bit of torque. I doubt they are likely to stick as such but maybe some kind of spindle failure or perhaps electrical / connection problem on the servo.
-
- Newbie
- Posts: 15
- Joined: Sat Feb 24, 2018 6:00 pm
Heating issue
Just to add closure on this. New thermostat and full coolant flush/renew and we are all good again
- Grumpyowl
- Lifer
- Posts: 3438
- Joined: Mon Aug 12, 2013 8:00 pm
- Location: North East Derbyshire
-
- Newbie
- Posts: 15
- Joined: Sat Feb 24, 2018 6:00 pm
Heating issue
From either. Middle vent was luke warm, drivers slightly warmer again. But not hot.
- Grumpyowl
- Lifer
- Posts: 3438
- Joined: Mon Aug 12, 2013 8:00 pm
- Location: North East Derbyshire
Heating issue
Different to mine then. Mine is hot on all dash vents and the drivers footwell burns your feet. the passenger footwell is blowing air but very cool.
Had the vents reset by DLV but it’s made no difference.
I’ve read some have restricted the flow into the driver footwell and that has improved the passenger side. It’s the only thing that doesn’t work on the car and on the rare occasion we use it in the cold we use the face vents and heated seats.
-
- Newbie
- Posts: 15
- Joined: Sat Feb 24, 2018 6:00 pm
Heating issue
Have you tried taking the glove box out and manually making sure the valves are moving? This was my next thing to try before dash removal.
- Grumpyowl
- Lifer
- Posts: 3438
- Joined: Mon Aug 12, 2013 8:00 pm
- Location: North East Derbyshire