Jump to content

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse

- - - - -

Over heating?

  • Please log in to reply
5 replies to this topic

#1 TheBush


    USMB is life!

  • Members
  • 173 posts
  • Pasco, WA

Posted 15 October 2007 - 10:10 AM

Well, here's the deal. Im driving. I have the heat on, and the engine temp on the dash is one notch below red. I turn the heat off, the engine temp drops to
about half. When I turn that gosh darn heater back on, the engine temp rises.

It scares me because when the heater is on it will sit at one notch below the red. I'm not liking that. My 21 year old Subie probably doesn't either.

#2 Reveeen


    Certified Subaru Nut

  • Members
  • 788 posts
  • Eastern Canada

Posted 15 October 2007 - 10:41 AM

If you mean "turning the heater fan on" and the temp rises, I would *suspect* an electrical "issue" rather than a temperature issue.

#3 beataru


    Subarus Catch on fire?!

  • Members
  • 1,203 posts
  • Phoenix

Posted 15 October 2007 - 01:54 PM

You have the digidash right? Me too, mine used to jump up hugely when I would turn my AC on, (yeah yeah I know its the ac not the heat) but right when I turned it off, about 3 seconds later, it would drop back down about 3-4 notches, so clearly it wasnt true that my coolant would heat up instantly and then cool off instantly. the digis are known to be sketchy when it comes to accuracy of the sensors.

#4 GeneralDisorder


    Elite Master of the Subaru

  • Members
  • 21,923 posts
  • Portland

Posted 15 October 2007 - 07:02 PM

It's not the accuracy of the sensors, it's the solder joints on the digi-dash circuit boards. Just like the sketchy EA82 clocks, the solder they used had a lot of flux and they appear to have not been heated enough to burn it off. The joints crack away from the board and the connection is crappy. Different voltages through the bad connections result in different readings as the amount of resistance from the poor connection changes the voltage drop across the circuit.


#5 nipper


    Semi Elite Master of the

  • Members
  • 18,195 posts
  • Long Island NY

Posted 15 October 2007 - 09:08 PM

My old digi dash did the same thing. It may be the dash, but check a couple of things. CHeck the alt output. CHeck the electric cooling fan and make sure the bearings are good.

Mine was a bad auxiliary fan, drawing too much current, pulling down the charging system.


#6 Sonicfrog


    Certified Subaru Nut

  • Members
  • 834 posts
  • Fresno

Posted 15 October 2007 - 09:13 PM

The screwey temp gauge problem, as I understand it, stems from either a bad ground on the gauge on the digi dash, or at the temp sensor itself.

Do you have a GL-10 or RX? If the car is a turbo, and you haven't already done so, you MUST (my command) replace the radiator with a dual core model. I blew two head gaskets, and several coolant hoses before I buckeled to someones advise on the board to do so. It will save you many $$$ on towing and parts for blown head gaskets.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users