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HEATER
Dec 28, 2006 13:27:52 GMT
Post by Deleted on Dec 28, 2006 13:27:52 GMT
Hi, Went out for a nice spin yesterday and the car ran well. However, we couldn't get much warm air out of the front heater. ?? Rear one was fine. Returned home and found that the in and out pipes were hot. To check further we let it cool down and removed the hoses. The on/off valve proved to be working fine, and we had a flow through the heater. Put it all back and tried again. Still cold air ?? Cold air to the screen and to the interior ?? When we put the fan on high it was freezing ?? Engine temp OK etc... Anyone had this problem ?? thanks, Mike
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HEATER
Dec 28, 2006 13:51:53 GMT
Post by johnwp5bcoupe on Dec 28, 2006 13:51:53 GMT
Assuming you have no airlocks the matrix could be blocked!
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HEATER
Dec 28, 2006 14:06:23 GMT
Post by Phil Nottingham on Dec 28, 2006 14:06:23 GMT
The previous two are the first to check but the valve can seize shut and is usually a prelude to total failure and loss of coolant!!!
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HEATER
Dec 28, 2006 15:27:37 GMT
Post by Deleted on Dec 28, 2006 15:27:37 GMT
H
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HEATER
Dec 28, 2006 15:38:10 GMT
Post by Deleted on Dec 28, 2006 15:38:10 GMT
Hi Guys, Thanks for replies. As I said we removed the in and out hoses and blew through the matrix. Clear as a bell. We switched the control valve on and of - works perfectly. We reckon it must be an airlock. ?? Cheers, Mike
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HEATER
Dec 28, 2006 17:29:46 GMT
Post by Phil Nottingham on Dec 28, 2006 17:29:46 GMT
Most likely - disconnect pipe on left hand side of heater and start engine till water runs out. If it keeps airlocking you have other problems
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HEATER
Dec 28, 2006 18:53:27 GMT
Post by Deleted on Dec 28, 2006 18:53:27 GMT
When we first had our P5B, the heater would only give warm air when travelling at about 60+ mph although rear heater was fine. After tests, I bit the bullet and removed and stripped the heater box, had the heater matrix re-cored and rebuilt the the heater box (powder coated the metal panels and renewed all the foam seals). The result is an excellent heater whatever the engine speed - which proved that the heater matrix can be the cause of a poor heater. Tip: If stripping the heater box, take lots of pictures /drawings of all the linkages and positions of flaps etc. These will be needed to rebuild the box correctly.
Good luck
Freddy
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HEATER
Dec 29, 2006 17:40:28 GMT
Post by Deleted on Dec 29, 2006 17:40:28 GMT
Thanks Freddy, I had hoped to avoid removing the heater box. Is it difficult or a pain to remove ? I also found that the valve to the rear heater is stuck in the open position. ! I had hoped to turn this off to see if that improved the front heater. I'm reluctant to force it. Mike
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HEATER
Dec 29, 2006 17:43:55 GMT
Post by Deleted on Dec 29, 2006 17:43:55 GMT
Hi, The heater box is not really difficult to remove - it is essentially just bolted to the bulkhead but there are a few things to remove and disconnect to make the job easier. Just take lots of (digital?) pictures or look at another P5 to copy when putting everything back together. It is worth the effort believe me! Happy New Year Freddy
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