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SportTrac Discussion
General Sport Trac Discussion
no heat
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<blockquote data-quote="Aaron Yarbough" data-source="post: 998507" data-attributes="member: 64114"><p>If you recently changed the coolant I bet there is a large air bubble in the heater core. What happens is that when driving down the highway enough coolant is forced through the line and the heater cools. When the engine slows down there is not enough pressure to push the coolant through the line so the air goes cold. The exact thing you described happened on my Infiniti G35 and sure enough once I bled the air out the problem was solved.</p><p></p><p>To bleed the heater core line disconnect the hose that goes through the firewall to the heater core (while cold). Use a small funnel and slowly pour antifreeze into the line so it allows the air to escape while you slowly fill the line with coolant. Reattach the line and I bet it solves the problem.</p></blockquote><p></p>
[QUOTE="Aaron Yarbough, post: 998507, member: 64114"] If you recently changed the coolant I bet there is a large air bubble in the heater core. What happens is that when driving down the highway enough coolant is forced through the line and the heater cools. When the engine slows down there is not enough pressure to push the coolant through the line so the air goes cold. The exact thing you described happened on my Infiniti G35 and sure enough once I bled the air out the problem was solved. To bleed the heater core line disconnect the hose that goes through the firewall to the heater core (while cold). Use a small funnel and slowly pour antifreeze into the line so it allows the air to escape while you slowly fill the line with coolant. Reattach the line and I bet it solves the problem. [/QUOTE]
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SportTrac Discussion
General Sport Trac Discussion
no heat
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