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Registered
Join Date: Aug 2007
Posts: 3
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Do I need new heat exchangers?
I have a 1973 1.7. It's never had much velocity coming out any of the vents in the cockpit. I removed the hose going into the DS heat exchanger - plenty of air. Disconnected the flapper valve - very little velocity going into the flapper valve. That makes me think there might be holes in the exchanger. Do these typically rust through? The flapper valve seems to operate fine.
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11-15-2009, 11:07 AM
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Registered
Join Date: Dec 2005
Location: Allentown, PA
Posts: 1,257
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The warm air velocity is roughly proportional to engine speed. The higher the RPM, the more air delivered to the interior. The booster fan that sits on top of the engine in early cars and below the relay box in the engine compartment on later cars significantly increases warm air velocity.
Heat exchangers can and do rust out. These are easily checked visibly for any signs of corrosion. I personally require heat in my car. I like driving it in the winter and heat is a must. |
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11-17-2009, 10:35 AM
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Join Date: Jan 2004
Location: Northern Virginia
Posts: 3,347
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My '76 had a heater blower fan. Even with only one heat exhanger hooked up, I fund the heat quite acceptable for Mid-Atlantic winters. Not sure what year the fan was "standard" as I don't recall my '70 having one...
And as mentioned, engine speed will effect speed/volume of air pushed into the compartment.
__________________
1970 914-6 Past: 2000 Boxster 2.7, 1987 944, 1987 924S 1978 911SC, 1976 914 2.0, 1970 914 w/2056 |
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11-17-2009, 07:23 PM
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Join Date: Aug 2007
Posts: 3
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The booster definitely works and yet, there is still just a hint of warm air coming through the vents at any RPM. At my advanced age of 35, things like warmth and good seals are becoming the priority.
I'll probably hold-off on replacing the heat exchangers until I upgrade to a 2.0. I think they take a different design. |
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11-17-2009, 08:51 PM
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Join Date: Dec 2005
Location: Allentown, PA
Posts: 1,257
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Do your current heat exchangers have holes in them? Post a pic. If they don't have holes and all the plumbing is there, you have some other problem of why not much heat.
I agree with the others, just one heat exchanger working and you should be able to feel relatively warm air coming from the vents. |
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11-18-2009, 04:47 AM
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