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Diagnosing Cooling problems

Discussion in 'Diagnosis/Help' started by Stig, Apr 17, 2009.

  1. spiedr0722

    spiedr0722 Well-Known Member Donated!

    Heres the picture of the valve

    Heres the Thermostat I picked up
  2. lone wolf

    lone wolf Well-Known Member Donated!

    I have the valve as well in my new one...
  3. spiedr0722

    spiedr0722 Well-Known Member Donated!

    What brand did you go with wolf?
  4. lone wolf

    lone wolf Well-Known Member Donated!

  5. Seank90

    Seank90 Well-Known Member Donated!

    Drill a small hole
  6. PazzwordJDM

    PazzwordJDM Member

    Hey Stig, this is the problem I'm having. It's Fall here in MI and that means its freezing in the morning when I head out to work and its 85 degrees F by noon. My morning drive to work is nearly 45 minutes and I'll crank the heat but it doesn't even seem to get mildly warm. My question is where exactly is the "heater valve" on the firewall and how would I unjam it? I figure I'll start here first. TIA
  7. vicdat

    vicdat Well-Known Member

    Hey guys
    Can any of you tell me where the A/C pressure sensor is located on '87 GTS auto?
    A pic and/ diagram would be great. My fan comes on when I turn on the key and I've checked just about everything else.
    Sorry to be such a pain...
  8. diablo

    diablo Guest

    At what temperature does the main fan kick in?

    Hi Guys/Gals,

    I have a ST162 with a 3SFE engine which we are using for a charity event (http://www.shitboxrally.com.au/). We bough it for $700 so really not expecting much. That said, we have fallen in love with it none the less. We are driving it from Sydney - Canberra and then to Townsville and raising money for charity.

    There are a few things of concern and I know the Stig has replied and helped in the past so hoping him or one of you is able to help.

    Running a bit warm/hot. Car would overheat when stationary or in traffic but somewhat fine on the open road. We checked the usual suspects, starting with leaks, blocked radiator and thermostat. All checked ok but we went ahead and replaced the radiator and the single fan with another radiator (from an Auto Camry I think) and two fans, doesn't really sit properly but that's fixable and the hoses all match. What we noticed was that the main fan would kick in only when the temp gauge was about to hit red but the temp would come down to just over half way. I hard wired the second fan to a switch on the dashboard and while this fan is on the temp remains somewhat constant just above half way but obviously the main fan never kicks in or only when I forget to switch the 2nd fan on. Could it be the temperature switch next on the thermostat housing? or perhaps the gauge is just not reading properly? either way is there an easy way to check. I am seriously considering disconnecting the cable from the temperature switch and just leave the fan running all the time. better safe than sorry and in reality we just need to get there just over 4000kms.

    2nd issue, car wont start straight away. it takes 4 to 5 goes before the it does, engine cranks over but there is no start but invariable it does after the 4 or 5 time. that said it either idles quite high @ around 1200rpm or way to low so much that the engine stops if not rev'd. after a while however the revs come down to under 1000 and seems happy enough.

    Love this car and if she makes it all the way and I am seriously considering bring it back and spending some money to get her to tiptop condition.

    Any help would be much appreciated.


    Fred (aka Diablo)

  9. Zaluss

    Zaluss Well-Known Member Donated!

    I believe the fan engages when the temp sensor reaches 195F and turns off when it goes to 185F. I'd have to review the manual to make sure. Normally you wouldn't want the fan running all the time as it would bring the coolant below normal operating temp but during a hard race that wouldn't be an issue. I would check to see if the coolant is bled properly as any air pockets may cause heating issues.

    The starting issue should be resolved by doing the starter relay mod found here http://st162.net/forum/showthread.php?97-4th-Gen-Starter-Problems. Its normal for the engine to start at a higher RPM at cold start to quickly warm up the engine. Once your car reaches normal operating temp, you can adjust the idle with the idle adjustment screw on the throttle body.

    Hope that helps!
  10. Stig

    Stig ST162 Guru Donated!

    The temp gauge is a liar on these - at 1/2 it is reading max (ie 100C).
    I suggest marking the gauges like I did before somebody blows your motor
    Stay out of the red zones and your motor will last a long time


    If you are having a temp issue the culprit is most likely the thermostat or a H/Gasket.
    If you test the thermostat in boiling water and check the radiator for signs of air or oil then you can eliminate these

    Starting issue is either low compression or low fuel pressure or dirty injectors
    Run some injector cleaner in it and see if it makes a difference, a major service is due before attempting to travel that far in 30C+ weather
  11. diablo

    diablo Guest

    Thank you.

    Thank you!
  12. diablo

    diablo Guest

    Thank you.

    Thanks Mate!
  13. vic dat

    vic dat Well-Known Member

    Bubbles in coolant recovery resivoir after shut-off.
    My rad cap was bad. The larger rubber gasket had started to deteriorate and was getting a little blow by into the tank. The crappy aftermarket caps are only good for a couple years...

    image.jpg image.jpg
  14. MattC

    MattC Well-Known Member Donated!

    Good to hear it was the cheapest thing to fix and not a bad head gasket :)
  15. vic dat

    vic dat Well-Known Member

    image.jpg image.jpg Agree...I don't want any HG related issues for a looong time

  16. eNtraxGT88

    eNtraxGT88 Well-Known Member Donated!

    i tried this on my halftrac st162 and while it did help the bubbling, the head gasket blew the last time it overheated LOL...
  17. vic dat

    vic dat Well-Known Member

    I ended up needing a water pump after all...
  18. MattC

    MattC Well-Known Member Donated!

    Ah well, good excuse to do the timing belt and front main seal while you're in there :p
  19. vic dat

    vic dat Well-Known Member

    Right Matt
    I ended up doin an assortment of needed maintenance. The car kicked my ass but i won the war... image.jpg New Aeroquip hi pressure hose w/ swivel, ps pump, water pump and belt and for good measure the master cyl started leaking at the time so I did it all...
  20. eNtraxGT88

    eNtraxGT88 Well-Known Member Donated!

    is that hose off the shelf? or custom made?

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