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Search Auto Parts Search Nissan Altima Heater Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum jerious New User Dec 11, 2008, 10:30 AM Post #1 of 3 (2622 views) Nissan Altima Heater Sign In I have a 2003 Nissan Altima 2.5L and having problems with the heater. I turn it on, it blows cool air. When I drive at fast speeds, the heat starts to work. When I slow down, it blows cool air. Any ideas? Thanks Tom Greenleaf Ultimate Carjunky / Moderator Dec 11, 2008, 10:42 AM Post #2 of 3 (2617 views) Re: Nissan Altima Heater Sign In Start with the basic checks - coolant known full, not overheating etc.. Then - feel hoses to and from heater core when it blows cold. If hot going in and stone cold (ambient temp) coming out it isn't getting adequate flow. Anything that could restrict flow could be at fault and possibly a strange behavior with a blend door but I don't think that's all that speed sensitive. There are more and more reports of failed water pump impellers that just can't cut it without higher RPMs and a way to check on that is to hold idle speed up to some reasonable speed and see if heat will return. If so or even improves a good amount I'd blame the water pump. I'd also expect to see corroded impeller when removed. It could also be a partially plugged heater core I suppose so put that on the check list too, T (This post was edited by Tom Greenleaf on Dec 11, 2008, 10:44 AM) jerious New User Dec 11, 2008, 10:47 AM Post #3 of 3 (2614 views) Re: Nissan Altima Heater Sign In Thanks for your help!   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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