MY HEATERS ARE BLOWING HOT THEN COLD PLEASE HELP!!
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This is a discussion on MY HEATERS ARE BLOWING HOT THEN COLD PLEASE HELP!! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Had my car now for 3 weeks wrx bug eye drove it every day for 3 weeks and has been ...

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    Exclamation MY HEATERS ARE BLOWING HOT THEN COLD PLEASE HELP!!

    Had my car now for 3 weeks wrx bug eye drove it every day for 3 weeks and has been 100%
    in the paper work the heads were done 600 miles ago new rad etc... but today i have been driving it and heaters are nice and warm and the temp gauge is one notch above cold next minute the heaters go cold and temp rises above half way and so on... as i parked up with the heaters blowing cold if i rev over 5000rpm heaters blow hot then if i let off the gas blow cold could tjis be the thermo as i called the garage who did the head and he said the water pump was in very good nick??
    please help
    oh and if it is the thermo few people have told me to take it out as there nothing but trouble! and where is the thermostat on the wrx bug eye cheers

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    He simply abides. SD_GR's Avatar
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    Don't guess unless you have to, and you don't. Let the car cool down. Check for circulation. If you have circulation, it's not the thermostat. In any case burp the system, as that's where my money's at. Burp it thoroughly, then repeat, and then again. I'm betting that'll do it.
    S
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    Registered User KnightFury's Avatar
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    Quote Originally Posted by SD_GR View Post
    Don't guess unless you have to, and you don't. Let the car cool down. Check for circulation. If you have circulation, it's not the thermostat. In any case burp the system, as that's where my money's at. Burp it thoroughly, then repeat, and then again. I'm betting that'll do it.
    S
    +1
    and just to answer your q where the thermo is located, follow the lower rad hose, goue to the thermo housing, simple two bolt removal, may be a good idea if your already there, possibly do a flush as well just for good measure, not nesicarily needed but whenev i have any isssue like that i always replace fluids, ( im a bit anal though when comes to my car) i see it that if im already there doin some work y not spend a tiny bit more and do a little more work that will need to be done later down the road any ways... good luck

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    He simply abides. SD_GR's Avatar
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    Replacing most of the coolant is inevitable at that point. Hopefully the OP simply has an air bubble in the system.

    By the way, OP, do your fans cycle on and off correctly?
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    Registered User KnightFury's Avatar
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    ^ hopefully

    Yes fan work is something to investigate as well, making sure fans kick on and both, in that year it takes bout 10 min at idle fior fans to kick on (well at least in my bugeye)

    Also clean and properly working heater core(good connections)

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    Registered User 2:43AM's Avatar
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    I'm going with air in the cooling system also or just plain LOW coolant. So first and foremost, check levels.

    Check the top coolant tank and the radiator. If low, get some good quality Subie coolant, mix 50/50 (typical) and pour it first into the radiator until full. Replace cap. Start engine and run the heater on full. Continue to add coolant into the top tank until full. You'll see it bubble and foam in there as air is purged out. If no more coolant can be added, replace cap and shut down the engine. Usually that's good enough unless you have a stubborn air pocket.

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    Smile

    the thermo is where your botton radiator hose is. it leads right into it. and its not a pain but you will get wet lol. but the thermo is very simplee to xhange if you need help then message me. ill take you into steps

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    Quote Originally Posted by New02scooby View Post
    the thermo is where your botton radiator hose is. it leads right into it. and its not a pain but you will get wet lol. but the thermo is very simplee to xhange if you need help then message me. ill take you into steps
    Mine is doing same!!! Car starts and gets up to temp fine then after say 5-10 mins of driving on low boost temp rise from 1/3 to 2/3...then heaters blow cold. Put the hammer down and push her hard with max boost and heaters blow hot and temp lowers...?!?! Changed thermostat and tried to burp system (not very well tho I might add!) but still same problem! Someone said It's water pump..coz one of heater pipes going into car is hot the other stone cold..radiator is also stone cold and expansion tank full...any suggestions!!! PLEASE!!!! I need help!!!

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    :(

    Maximus mine was doing the same. I know you don't wanna hear this but I had a cracked head it thru the whole compression system off and made it do that. Every sign yours is showing mine showed. Start the car.. Open radiator cap and if it starts Gurgling out and blowing out within a minute pm me

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    Ok when i get home i will look and see what she does...TBH i emailed a guy here in UK he's known as one of the best in UK 30 years experience with the Scoobies and he said its head gasket..hes quoted me 900....im gutted. I guess price isnt that bad for a top Subaru specialist?? Ive just had to take a loan out to fix her....as im skint from crimbo! bad times.....I really really wish that when i had my money i went with another car. I had 3 choices Honda Civic Type R, Subaru and Evo. I obviously made the WRONG choice......

    I really hope it isnt cracked though??!?! Coz thats a new head, gasket etc...that would be more than 900 wudnt it! He told me to drive her very slowly and leave header tank cap off all the way .... he's about 40 miles away, that sound about right???

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    Ps...He mapped my car when i first got it and everyone i know or have spoken to in UK who owns a scooby vouches for this guy...he's the boy when it comes to scoobies so i trust his judgement. actually, now im thinking and re-read what you said it does gurgle out of radiator when cap is off. I was thinking header tank. No ive done it few times with rad cap off trying to get rid of bubbles and air locks...radiator gurgles and throws coolant out. when i say gurgle the coolant raises ou like as if its pushed out and bubbles come out along with coolant.

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    Registered User EvoEatr's Avatar
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    as mentioned Air in the system is my best guess...assuming someone competent did the engine work. Also any competent tech that I know of, when you replace head gaskets or the like, would most definitely install a new thermostat and gasket, at least I do whenever I do a head job.

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