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Old 10-01-16, 07:46 PM   #1
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Default 308 Luke warm heater.

Hi guys! Newbie here! Just bought a 2008 308. Problem is the heater not hot. Now, thermostat been changed, matrix flushed.

It does go cold when turned to position, just hot ain't hot! I'm suspecting electrical. Any ideas?
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Old 10-01-16, 09:11 PM   #2
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Sounds like it may have an air lock, bleed the system and top up coolant level - five mins tops!
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Old 10-01-16, 09:31 PM   #3
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mmmmm.... I did but maybe not properly. Had an old Bmw that was a pia to bleed. Any tricks or a link to a how to?

Any possibility symptoms could be electrical if not his?

Thanks for your help.
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Old 10-01-16, 10:40 PM   #4
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Have you flushed and replaced coolant recently?

First get the engine warm but not hot! Carefully remove the expansion cap, then remove the bleeder cap,(try not to drop it) replace bleeder cap when all air has passed and coolant starts flowing out, check level and replace expansion cap!

Take the car for a short spin try the heating again then repeat until no air is in the system - if that fails, then get it scanned!
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Last edited by ThorsRevenge; 10-01-16 at 11:11 PM. Reason: Update
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Old 08-11-16, 12:20 PM   #5
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Quote:
Originally Posted by Davaroo View Post
Hi guys! Newbie here! Just bought a 2008 308. Problem is the heater not hot. Now, thermostat been changed, matrix flushed.

It does go cold when turned to position, just hot ain't hot! I'm suspecting electrical. Any ideas?
Hi ya. Did you ever solve this. I've got same problem mine!

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Old 08-11-16, 06:40 PM   #6
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I had the same problem. Turned out to be the heater matrix. The car ran fine at 90 once warm.

I took the panel in the passenger footwell off that covers the inlet and outlet pipes. Ran the engine until hot. At this stage both pipes were very hot. Switched fan to 4 and found that the air was hot for less than a minute. The outlet pipe was much cooler by this time. I reckoned this meant a lack of flow - blockage somewhere or waterpump. I didn't think it could be the thermostat as the heater is still in the flow circuit when it's closed.

Anyway I went for the cheapest option of a matrix off ebay for 30. Worked a treat. I could barely blow through the old matrix. A flush would not have got rid of the muck in there. I hope the rest of the system isn't similarly choked up. The drained coolant looked clean enough.

By the way the O rings don't seem to be available from Peugeot on their own. They are 16mm Id with 3.5mm cross section. Ebay again.

Sorry about length of this post but it'll be worth it when your heater starts working again.
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Old 08-11-16, 08:13 PM   #7
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Thanks nico. Did it take long to change and is it easy to get to? You imagine removing the whole dash!

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Old 08-11-16, 08:58 PM   #8
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Actually easier than I thought. Dashboard doesn't have to come out. Once I got the panel in the passenger footwell off I removed the bracket that holds the 2 pipes to the bulkhead (2 small screws - quite difficult to see). That gave enough movement to move the pipes out of the way when disconnected from the matrix (clipped in). There are then 4 screws that hold the matrix into the housing.

Obviously the system has to be drained but that still leaves coolant in the heater pipes and matrix. I put plastic sheet under the unit and it covered the whole (so I thought) footwell too so I could lift out the coolant. I still managed to spill a half litre or so - it comes out fast!

It took barely an hour to do in the drive. It took me longer to dry the carpets out!

Haynes manual has it all and is reasonably detailed. You may find something on youtube about it. The matrix is the same as some Citroen C3 Picassos (09 - 15). Definately use new O rings and clean the area where the O rings sit on the pipes.

Hope it goes well if you decide to go ahead.
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Old 08-11-16, 10:02 PM   #9
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Quote:
Originally Posted by mookev View Post
Hi ya. Did you ever solve this. I've got same problem mine!

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Check thermostat and bleed matrix, could be an air lock!


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Old 09-11-16, 07:30 AM   #10
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Quote:
Originally Posted by nico View Post
Sorry about length of this post but it'll be worth it when your heater starts working again.
No apology necessary. Thank you for contributing so much as a new user, its most appreciated.
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