# Heating issue with the Subaru. **URL:** \ **Category:** Shift518 Automotive\ **Created:** [December 29, 2008, 10:46am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044 "2008-12-29T10:46:32Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Vovchandr](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/vovchandr/32/6275_2.png) [@Vovchandr](https://forums.speedlife.net/u/Vovchandr)\ **Post date:** [December 29, 2008, 10:46am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/1 "2008-12-29T10:46:32Z")
Let’s who is the guru around these parts and can figure out this gremlin. The Subaru has an issue blowing hot air on occasion. It will be upto operating temperature on the gauge, blowing burning hot air as I’m moving, but then can suddenly change into luke warm air at will, whether moving or stopped. I can turn it off, let it sit in the “off” position for a minute and turn it back on to find either hot air or still luke warm air (Most of the time goes back to hot air). I eliminated the bubbles in the system as being an issue by having a coolant flush done at Fire Stone. They told me, that the radiator cap was not holding pressure so I replaced that as well. Still happens. So from what I understand its Low coolant Thermostat Heater Core Radiator Cap Leaking hoses are out of the equation. I’m stumped. ---
**Author:** ![CustomLowz](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/customlowz/32/6279_2.png) [@CustomLowz](https://forums.speedlife.net/u/CustomLowz)\ **Post date:** [December 29, 2008, 10:48am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/2 "2008-12-29T10:48:41Z")
Loose nut behind the wheel? ---
**Author:** ![n\_cole](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/n_cole/32/6382_2.png) [@n\_cole](https://forums.speedlife.net/u/n_cole)\ **Post date:** [December 29, 2008, 10:49am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/3 "2008-12-29T10:49:13Z")
Aren’t you Russians supposed to be used to the cold? Why do you need heat? :tong :hug ---
**Author:** ![tdi\_logik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tdi_logik/32/6310_2.png) [@tdi\_logik](https://forums.speedlife.net/u/tdi_logik)\ **Post date:** [December 29, 2008, 10:51am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/4 "2008-12-29T10:51:03Z")
take it back to firestone. they fucked up. have them deal with it for FREE. ---
**Author:** ![Alpine](https://avatars.discourse-cdn.com/v4/letter/a/4da419/32.png) [@Alpine](https://forums.speedlife.net/u/Alpine)\ **Post date:** [December 29, 2008, 10:53am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/5 "2008-12-29T10:53:46Z")
Firestone FTL. My Zed24 did the same thing when the system wasn’t burped properly. ---
**Author:** ![crazybrew609](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/crazybrew609/32/6319_2.png) [@crazybrew609](https://forums.speedlife.net/u/crazybrew609)\ **Post date:** [December 29, 2008, 10:55am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/6 "2008-12-29T10:55:01Z")
could be a resistor car, faulty control head, if you can see/feel the header core make sure it’s getting warm… if it is then you know it’s gotta be electrical, you could also feel the hoses going in and out of the firewall to make sure the lines are heating up ---
**Author:** ![Celtic1982citleC](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/celtic1982citlec/32/6323_2.png) [@Celtic1982citleC](https://forums.speedlife.net/u/Celtic1982citleC)\ **Post date:** [December 29, 2008, 10:58am UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/7 "2008-12-29T10:58:01Z")
I’d help but my love for Subaru is non-existant. Freaking junk. :headbang ---
**Author:** ![SDP](https://avatars.discourse-cdn.com/v4/letter/s/e95f7d/32.png) [@SDP](https://forums.speedlife.net/u/SDP)\ **Post date:** [December 29, 2008, 2:37pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/8 "2008-12-29T14:37:28Z")
Most firestone mechanics are as dumb as rocks, i’ll bet there is air in the system. Don’t get to over complicated, start with the basic stuff first. ---
**Author:** ![Auto0utcast](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/auto0utcast/32/6281_2.png) [@Auto0utcast](https://forums.speedlife.net/u/Auto0utcast)\ **Post date:** [December 29, 2008, 2:52pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/9 "2008-12-29T14:52:59Z")
try checking the mode door/blend door actuators in the dash. they divert hot and cold air to regulate temperature. one could be broken in the dash and is getting blown open/closed by the blower motor. but what do i know… :umm ---
**Author:** ![MclarenGP](https://avatars.discourse-cdn.com/v4/letter/m/57b2e6/32.png) [@MclarenGP](https://forums.speedlife.net/u/MclarenGP)\ **Post date:** [December 29, 2008, 2:55pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/10 "2008-12-29T14:55:36Z")
sounds like the heater core is clogged up… you might need to let some draino sit in there and blow it out wit a pressure washer back and fourth to unclog it. ---
**Author:** ![Auto0utcast](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/auto0utcast/32/6281_2.png) [@Auto0utcast](https://forums.speedlife.net/u/Auto0utcast)\ **Post date:** [December 29, 2008, 3:00pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/11 "2008-12-29T15:00:27Z")
> [@MclarenGP](#): > > sounds like the heater core is clogged up… you might need to let some draino sit in there and blow it out wit a pressure washer back and fourth to unclog it. thats actually not very common with subaru’s… my money is still on the mode/blend door. ---
**Author:** ![MclarenGP](https://avatars.discourse-cdn.com/v4/letter/m/57b2e6/32.png) [@MclarenGP](https://forums.speedlife.net/u/MclarenGP)\ **Post date:** [December 29, 2008, 3:02pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/12 "2008-12-29T15:02:21Z")
sounds like either/or but i believe ya that happend to my buddys ac so we just tied it shut. ---
**Author:** ![Sully93vr4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sully93vr4/32/6278_2.png) [@Sully93vr4](https://forums.speedlife.net/u/Sully93vr4)\ **Post date:** [December 29, 2008, 3:06pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/13 "2008-12-29T15:06:16Z")
Thats wierd, I always thought subaru’s got really hot. Almost to the point of bursting into flames. ---
**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\ **Post date:** [December 29, 2008, 5:53pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/14 "2008-12-29T17:53:16Z")
ill put money on the core is pluggin up doesent matter if its common or not it happens we have a core flushin tool at work works wit the hose and air blasts most shit out never seen it not work :nod ---
**Author:** ![Vovchandr](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/vovchandr/32/6275_2.png) [@Vovchandr](https://forums.speedlife.net/u/Vovchandr)\ **Post date:** [December 29, 2008, 7:51pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/15 "2008-12-29T19:51:51Z")
If my core was clogging up wouldn’t it be always blowing mediocre air? If I come back there without any solid proof of the air in the line how would they be liable to redo the service? Heater core would be the worst case scenario. In Japanese cars that’s pretty much the first item that goes into the shell and everything builds around it… not fun. ---
**Author:** ![Auto0utcast](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/auto0utcast/32/6281_2.png) [@Auto0utcast](https://forums.speedlife.net/u/Auto0utcast)\ **Post date:** [December 29, 2008, 7:55pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/16 "2008-12-29T19:55:00Z")
> [@Vovchandr](#): > > If my core was clogging up wouldn’t it be always blowing mediocre air? > > If I come back there without any solid proof of the air in the line how would they be liable to redo the service? > > Heater core would be the worst case scenario. In Japanese cars that’s pretty much the first item that goes into the shell and everything builds around it… not fun. vlad, like i said… mode door/blend door actuators in the dash… get it looked at. ---
**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\ **Post date:** [December 29, 2008, 7:55pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/17 "2008-12-29T19:55:15Z")
if a core starts cloggin it will push heat in the higher r,s due to more water pressure bein fed into them ,the best way to tell is get the car to runnin temp see if heater core hoses are equal pressure or very close to the same any diff in like 15 degrees ya know its there.and air wont be trapped in it if filled correctly ---
**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\ **Post date:** [December 29, 2008, 7:55pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/18 "2008-12-29T19:55:57Z")
> [@EJ257FTW](#): > > vlad, like i said… mode door/blend door actuators in the dash… get it looked at. if it was a door it would be constant not on and off ---
**Author:** ![Auto0utcast](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/auto0utcast/32/6281_2.png) [@Auto0utcast](https://forums.speedlife.net/u/Auto0utcast)\ **Post date:** [December 29, 2008, 7:57pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/19 "2008-12-29T19:57:24Z")
> [@88slowmarro](#): > > if it was a door it would be constant not on and off not necessarily. if the door itself was broken off the actuator it could be being blown side to side by the air itself. thus creating the hot/cold effect. ---
**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\ **Post date:** [December 29, 2008, 7:58pm UTC](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044/20 "2008-12-29T19:58:34Z")
> [@EJ257FTW](#): > > not necessarily. if the door itself was broken off the actuator it could be being blown side to side by the air itself. thus creating the hot/cold effect. not likely as there is pressure on it in either direction it wouldnt be all floppy like a cock [Next page](https://forums.speedlife.net/t/heating-issue-with-the-subaru/241044.md?page=2)