92 vert Posted March 31, 2012 Share Posted March 31, 2012 After owning Mustangs my whole life I just traded in my last GT for a 08 Fusion 2 weeks ago.... My problem is that it takes around 10 minutes after I start the car for the heat to blow hot...also when you are driving the heat works ok but as soon as you stop the heat starts blowing cold till you start moving again.. This Fusion has the Auto climate control also. 0 Quote Link to comment Share on other sites More sharing options...
FusionDiffusion Posted March 31, 2012 Share Posted March 31, 2012 (edited) Sounds like a bad water pump or perhaps a partially clogged heater core. Edited March 31, 2012 by FusionDiffusion 0 Quote Link to comment Share on other sites More sharing options...
dennisw Posted April 1, 2012 Share Posted April 1, 2012 Most likely a thermostat that is not closing completely. 0 Quote Link to comment Share on other sites More sharing options...
92 vert Posted April 1, 2012 Author Share Posted April 1, 2012 Thanks....I bought it from Carmax so I can take it back to be fixed as I have a 30 day warranty...my first thought was the thermostat also,its weird as the engine temps are steady. 0 Quote Link to comment Share on other sites More sharing options...
FusionDiffusion Posted April 1, 2012 Share Posted April 1, 2012 If the thermostat was not closing, you would notice a loss of heat at speed, not at idle. Watch the temp needle when you loose heat. If it doesn't change, then the problem is related to lack of flow through the heater core. If the fins of the water pump are worn away, then you won't be pumping very much coolant at idle and the coolant flowing though the core will cool down faster than it can be replaced. You can try revving the engine in park or neutral and see if that restores heat since the pump will be spinning faster and pumping more. 1 Quote Link to comment Share on other sites More sharing options...
dennisw Posted April 1, 2012 Share Posted April 1, 2012 If the thermostat was not closing, you would notice a loss of heat at speed, not at idle. Watch the temp needle when you loose heat. If it doesn't change, then the problem is related to lack of flow through the heater core. If the fins of the water pump are worn away, then you won't be pumping very much coolant at idle and the coolant flowing though the core will cool down faster than it can be replaced. You can try revving the engine in park or neutral and see if that restores heat since the pump will be spinning faster and pumping more. This is totally wrong. If the pump is bad you will heat up at idle not cool down. If water stops flowing it is a heating up issue not a to cool issue. A stuck or partially stuck thermostat causes this not a defective pump. It may be something else but a water pump it is not. Any time water stops flowing are slows down in a radiator the car will over heat not get colder that's as simple as I can say that. 0 Quote Link to comment Share on other sites More sharing options...
FusionDiffusion Posted April 1, 2012 Share Posted April 1, 2012 This is totally wrong. If the pump is bad you will heat up at idle not cool down. If water stops flowing it is a heating up issue not a to cool issue. A stuck or partially stuck thermostat causes this not a defective pump. It may be something else but a water pump it is not. Any time water stops flowing are slows down in a radiator the car will over heat not get colder that's as simple as I can say that. And all I'll say is I've actually seen Fords with worn-out water pumps that don't overheat but the heater gets cold. Changing the water pump (not the thermostat) fixed the problem. 0 Quote Link to comment Share on other sites More sharing options...
92 vert Posted April 5, 2012 Author Share Posted April 5, 2012 I just picked up the car...the lack of heat was caused by a leaking water connector pipe assembly....all is good now. 0 Quote Link to comment Share on other sites More sharing options...
Bert Posted April 6, 2012 Share Posted April 6, 2012 Glad to hear. Thanks for the update. 0 Quote Link to comment Share on other sites More sharing options...
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