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Old 11-06-2014, 04:18 PM   #1
Jsposito
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Heater not blowing at idle??

I'm hoping someone can lend some insight or advice. My heater blows hot and hard when I'm cruising down the highway but doesn't blow at all when sitting at idle. This is a new truck that I've just started working on so I don't know much of it's history. Does anyone have any ideas what would be causing this issue? It's going to start snowing soon and a fully functional heater sure would be nice!!
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Old 11-06-2014, 04:21 PM   #2
jjzepplin
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Re: Heater not blowing at idle??

Can you hear the fan working? Pics of the heater hose routing might shed some light on this.
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Old 11-06-2014, 05:21 PM   #3
Devins-step
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Re: Heater not blowing at idle??

Quote:
Originally Posted by Jsposito View Post
I'm hoping someone can lend some insight or advice. My heater blows hot and hard when I'm cruising down the highway but doesn't blow at all when sitting at idle. This is a new truck that I've just started working on so I don't know much of it's history. Does anyone have any ideas what would be causing this issue? It's going to start snowing soon and a fully functional heater sure would be nice!!
Could it be alternator or voltage regulator? I am having a similar problem with the wiper motor on my '72.
Dan
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