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Old 11-23-2008, 05:40 PM   #1
jester696
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Default It's 14 degrees out and my car is blowing cold air!!!

I start my car up in the morning so that my windshield defrosts. The only problem is my car only produces cold air until I drive it. When I drive, it will blow hot air. I really appreciate the help if anyone can give me some info.

~J
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Old 11-23-2008, 05:47 PM   #2
prometheum
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you understand the heater works by using engine coolant don't you?
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Old 11-23-2008, 05:51 PM   #3
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If I stop driving my car,(say at a stop light) it turns to cold air again
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Old 11-23-2008, 06:30 PM   #4
dudley123
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because the water pump is not spinning nearly as fast as when you are driving.. IF you rev the car at a stop, the hot air will return.
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Old 11-23-2008, 06:38 PM   #5
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So what is the cause? Maybe the thermostat is stuck open. How is the coolant level? Check it out
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Old 11-23-2008, 07:15 PM   #6
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Check your coolant level, and antifreeze mixture first. Cold air can be a sign of low coolant, or slush formation in the cooling system or freezing in the radiator. At low water pump speeds no hot water can get to the heater core.

Second most likely is a theromstat stuck open. Put a piece of cardboard infront of the radiator, and if the engine warms up normally then, you probably have either a bad water pump or a bad thermostat. If the engine has been partially frozen the ice can lock the water pump rotor and when the engine starts, it twists the impeller on the water pump shaft. This kills the water pump. Likewise freezing can damage the thermostat (also over heating can kill them).

If you are having 14 deg temps you need antifreeze protection that is at least -10 deg F to be safe, prefer -30 or better protection (50/50 mix of water and antifreeze).

Larry
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Old 11-23-2008, 08:48 PM   #7
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I agree, coolant level or t-stat.
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Old 11-23-2008, 09:06 PM   #8
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I just read this thread an hour ago, drove to the store and now my car is doing the exact same thing.....wtf
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Old 11-23-2008, 09:15 PM   #9
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Doesn't the ac come on with the defroster? On mine the ac can be turned off with the defroster still on, doesn't clear the windshield nearly as good on rainy days, but does seem to clear the frost away quicker. Don't think that's your problem though but it might help defrost quicker.

FYI, the old Ranger pickup didn't have enough antifreeze in the coolant and it did basically the same thing. Heater would slightly warm up sitting in the drive but as soon as moving it would turn cold as the coolant slushed up.
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Old 11-23-2008, 09:29 PM   #10
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so weird that this thread comes up b/c my girlfriend was complaining about it being cold in the passenger seat...i'm never cold in my car when i'm driving...dono why

but anyways i felt it and i'll be damn my car is doing the same thing...i think i'm a tad bit low on antifreeze...but its only gotten down to about 25 and my car still stays realllllllll cold...about 160 when crusing...
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Old 11-23-2008, 09:33 PM   #11
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Definitely sounds like a thermostat stuck open, or your heater core is clogged.
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Old 11-23-2008, 10:43 PM   #12
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Or a blown head gasket...
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Old 11-24-2008, 01:07 AM   #13
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??^^^ Wouldnt you have some white smoke issues also then?
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Old 11-24-2008, 01:52 AM   #14
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Does your car overheat at idle when it blows cold air?
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Old 11-24-2008, 02:08 AM   #15
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If a blown HG is just leaking a little combustion gases into the coolant, you get air pockets and no heat. That's worst case, I just wanted to throw it out there, 'cause it is possible. I've never actually seen a 'stat go bad.

OP has an 07. That's mighty new to have any real issues.
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Old 11-24-2008, 03:00 AM   #16
04 Slo Sti
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i checked my coolant level and its a lil low...i'm assuming thats the OP problem


check coolant level
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Old 11-24-2008, 04:54 PM   #17
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yea...coolant was way low

Thanks for the help
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Old 11-24-2008, 05:53 PM   #18
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It would only be low if it leaked out. It's a closed system. You have a coolant leak somewhere.
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Old 11-24-2008, 06:13 PM   #19
04 Slo Sti
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eh filled my coolant today....wasn't really empty at all...


so i'm gonna keep this thread up and hope for the best....car runs great otherwise...
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Old 11-24-2008, 06:23 PM   #20
Subaruski
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head gasket bye bye
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Old 11-24-2008, 07:00 PM   #21
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Quote:
Originally Posted by MasterKwan View Post
Or a blown head gasket...

I agree, I read this and was thinking "That's how my car acted right before the HG blew"
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Old 11-24-2008, 07:39 PM   #22
jester696
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Quote:
Originally Posted by MasterKwan View Post
It would only be low if it leaked out. It's a closed system. You have a coolant leak somewhere.
Just finished my 20G / tranny swap...there is no leak
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Old 11-24-2008, 07:44 PM   #23
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Could also be air in the system.*
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Old 11-24-2008, 09:20 PM   #24
04 Slo Sti
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my damn car has 60,000 miles on it...if the headgasket is on its way out....the damn car is on its way out..

i know how it acts when the head gaskets go....buddy's RS did the stupid heat thing...my car isn't showing signs of that at all....

it only does it when its sittin at 500 rpms and its not even all the time......so its weird....car runs extermely cold 160 degree's according to my temp gauge and 180 when i'm sittin for a bit.. and uses no coolant...

any other ideas?

if it were the gaskets i think i'd be losing coolant as my buddy did with his RS?
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Old 12-04-2008, 02:42 PM   #25
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Quote:
Originally Posted by silentt View Post
Does your car overheat at idle when it blows cold air?
what does it mean when it overheats at idle while blowing cold air and returns to normal when it starts blowing warm air?
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