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Topic
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Since winter came around we noticed a problem with the HVAC system on this 96 Dodge B2500 RAM van:
– when the AC/Heater is off cold air is still coming in through the vents – the higher the speed, the more cold air we have rushing through the vents
– if the Heater is on we have hot air while idling/travelling at low speeds up to 50 mph but the air gets cold when we get up to highway speedsEngine temperature stays constant the whole time, just inside air temperature changes with speed.
Is there a door/vacuum line that regulates the air coming from outside?
How can we find this HVAC door/line before we freeze completely in this van?
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Replies
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You should get heat with driving. Check your coolant level
thats its full. You may have a thermostat issue. To test
the blend door. Put the fan on high and the vent selector
on center vent. Then move from fresh air to recirculate.
you should here the fan get stronger.The flip it back and
listen for the sound/air change. If you have a scanner plug
in and read coolant temp while driving and at idle.
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