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Why would the heater work fine while driving over 40 mph but as soon as the car drops below a certain speed the heater starts blowing cold air?
Wiki User
∙ 15y ago
The problem you have sounds like a vacume leak, most likely under your dash, in your heater control tubing. As your driving speed increases, so does the vacume created in your intake manifold, and as your heater control is vacume actuated, it is affected by engine RPM's. Look for a loose fitting, or a tube joint that has come apart under the dash first. Start the car, listen for leaks, you could even blow smoke around the lines to see the smoke get sucked into the loose fitting. If nothing under the dash is found, the vacume leak may be elsewhere, but that usually causes a rough idle too. Hope this helps! W. Cook Canada
Wiki User
∙ 15y ago
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