heat not working HELP! - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 09-27-2011 Thread Starter
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heat not working HELP!

my heat will only work if im accelerating, my engine temp will b right in the middle but itll only blow hot if im on the gas. the second i take my foot off the gas it goes back to lukewarm/cold

any ideas?


2006 vista blue pony package v6. shaker 1000, roush louvers, rousch hood scoop, cal special side vents, saleen rear louvers, gt500 strut tower brace, cdc chin spoiler,custom painted gt bumper, gt h pipe and mid pipes and ford racing stingers.

future mods - possible sct tuner and JLT Cold air intake and t loc.
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post #2 of 4 (permalink) Old 09-27-2011
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Joined: May 2011
Location: Boston
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So, first up, you're not low on coolant, right?

Otherwise, from those symptoms, sounds like a coolant circulation problem
(through the heater core). Since you don't mention the car overheating,
it's probably not the water pump, so next thing would be to flush out the core.

I honestly haven't researched to see if it's possible for air to get
trapped in the heater core/lines with this car, but if the coolant
was changed recently, maybe it needs to be "burped".


'10 Mustang GT Premium
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post #3 of 4 (permalink) Old 09-27-2011
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Sounds like either a low coolant issue, or a thermostat that may be sticking open some. The temperature gauge in these cars is basically an idiot gauge. Within a certain range of operating temperature the controller just tells the gauge to set in the middle and not to move, in the meantime the engine temperature could’ve changed 25 degrees. When the temperature goes beyond preset limits then the controller tells the gauge to move to either hot or cold, depending on what the engine data is. Guess Ford doesn’t want to worry drivers over what they consider normal temperature excursions.
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post #4 of 4 (permalink) Old 09-27-2011 Thread Starter
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took it to a dealership (ik bad idea cuz its so pricey but i work for a sister dealership so i get cheaper rates for parts and labor) but yea my lower thermostat housing was crack and leaking coolant. there goes a few hundred bucks.

2006 vista blue pony package v6. shaker 1000, roush louvers, rousch hood scoop, cal special side vents, saleen rear louvers, gt500 strut tower brace, cdc chin spoiler,custom painted gt bumper, gt h pipe and mid pipes and ford racing stingers.

future mods - possible sct tuner and JLT Cold air intake and t loc.
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