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Heat from left, cold from right Posted by Arabiflora [Email]  (#1129) [Profile/Gallery]
(more from Arabiflora) on Sun, 11 Feb 2007 21:00:55
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Cabin heat issues remain (search username for prior post if you wish) and I've gone deep into the bowels of my '88 900S (NA) to see what's up. I dropped the knee bolster, inspected heat distribution immediately out of the heater core chamber. With car at operating temp and temp dial set to max heat, toasty warm air out of left (driver's) side port, cold air out of right port. I opened up the heater core panel to inspect radiator fins and air circulation patterns. Equal air flow through core on both sides, but fins on left are hot (almost too hot to touch for long), fins on right are cold.
Here's what I can't understand: Let's say the heater core is clogged midway through coolant transit (I presume that it enters core on driver's side and exits on pass.). Is that sufficient to cause uneven heat distribution across the core? My gut says no, since any block in the system should limit flow throughout, so no good reason to think that inlet side, merely by virtue of being closest to hot coolant source, should be so drastically warmer than downstream parts.
The only alternative hypothesis that I've considered is that the duct work and gating that provides cold air to the center vents (even when heat is on) is somehow mis-routed, diverted in such a way that the right side of my heater core is cooled by that as a result. I don't know anything about the the intake or other plumbing that supplies the center vent cold air supply works, so don't know whether this is even a possibility.
For what it's worth, the car has 366k mi, heater core is original. In searching the board for info I've seen posts from some who say that 900 Saab heater cores are almost unknown to be root cause of heating problems, but maybe this is an exception?
Thoughts, suggestions welcome, thanks in advance.
Arabiflora
, Sun, 11 Feb 2007 21:00:55 <-- Viewing This Message, Mon, 12 Feb 2007 20:34:59, Tue, 13 Feb 2007 21:23:22
, Mon, 12 Feb 2007 08:00:50
, Mon, 12 Feb 2007 14:55:35
, Mon, 12 Feb 2007 07:51:57
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