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Help make my car COOL!

Posted by GSXReHab, Mar 3, 2012

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  1. GSXReHab

    GSXReHab Probationary Member

    Joined Feb 13, 2012
    Baton Rouge, Louisiana
    Rebuilt motor with forge internals but used factory crank cause I heard they were a beast. Was this a good idea? More importantly; Also new rebuilt motor has only 40 miles on it. Been trying to break the engine in but motor is overheating. I never let the gauge get into the red but all the water is boiling out of the overflow first. I changed the thermostat (I could see it was broken when removed). But that didn't fix the problem, unless the brand new one broke too?, hadnt checked that yet. It wll idle all day and never get hot. Both radiator fans come on like they are supposed to and I can see the water circulating. Then I go for a ride and it gets hot. Is it just the friction from the new engine or something? I've been breaking it in but not ever going past 5k RPM, running it but not killing it. New oil looks great, no water. My project cant progress until I fix this and I'm pulling my hair out. This happen to anyone else
  2. JKsTSiAWD

    JKsTSiAWD Proven Member

    Joined Nov 13, 2011
    Lincoln, Nebraska
    The stock crank should be fine. I can't explain your overheating problem, however, but I'm sure someone else here can.

    211  0

    1991 Eagle Talon TSi AWD
    · 1G DSM
  3. datbmac

    datbmac Proven Member

    Joined Feb 5, 2011
    Florence, South Carolina
    Have you bled the coolant system of air? Air can cause the syptoms you are having.

    DSMDEMON93 Proven Member

    Joined Feb 18, 2009
    San Jose, California
    When the engine was assembled, was the head torqued down properly? Was the headgasket re-used?

    564  0

    1995 Mitsubishi Eclipse GSX
    · 2G DSM
  5. Phantom DSM

    Phantom DSM Proven Member

    Joined Jan 28, 2007
    Dallas, Texas
    The overheating issue is of great concern if the motor is still new and you have already swapped out the thermostat.
    Bleed the cooling system by taking off radiator cap and Start the car when cold and turn on your heater on high, and fill with coolant mixture and your overflow bottle as well. Allow car to idle and wait until you see bubbles, usually until your fans need to kick in. By running your heater, the heater core might fill as well so just top off as necessary until you do not see bubbles and screw on radiator cap .

    Try also doing a compression test to see the health of this new motor and as DSMDEMON93 said it is possible head was not torqued down properly with torque spec and pattern. I hope that head was not previously warped from overheating.:pray:
  6. eli96talon

    eli96talon Proven Member

    Joined Feb 16, 2012
    mt.pleasant, Texas
    I say plus 1 on the bleeding issue...if you don't bleed the cooling system it will cause the problems you are having.puting water in the radiator ig not enough,allthough the water going into the overflow tank on SOME cars is a sign of a blown headgasket or not being torqued right.
  7. Talon IV

    Talon IV Proven Member

    Joined Aug 12, 2011
    Clifton, Colorado
    Plus 2 on this. We all pray your head gasket was not reused and everything was torqued right:pray: Also how is your radiator cap? Typically that is a number one issue of overheating. I have never heard of water going into the over flow as a bad sign but im not gonna rule it out either.
  8. fonzi90Tsi

    fonzi90Tsi Proven Member

    Joined Feb 17, 2012
    Bakersfield, California
    Drain some of the water. Add coolant and continue adding while you are bleeding..

    523  0

    1991 Mitsubishi Eclipse GSX
    15.422 @ 91.421 · 1G DSM
  9. Alan11

    Alan11 Proven Member

    Joined Apr 30, 2010
    El Paso, Texas
    Is the water pump new? Are there any leaks..Do a compression test to make sure the head is good...Agreed on bleeding the system.. and there is no such thing as breaking in an engine.. if everything in a rebuilt is done right it should work like a normal car.... "breaking in an engine" to me is to letting the piston rings set, but that depends on what rings you use..
    Last edited: Mar 3, 2012

    625  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
  10. KevinRR

    KevinRR Proven Member

    Joined Sep 11, 2007
    Milwaukee, Wisconsin
    The simple thing for you to do first is replaced the radiator cap, bleed the system again and drive it around to see if it still overheat. A bad radiator cap will also cause it to overheat while your driving.
  11. miguelmcv

    miguelmcv Supporting Member

    Joined May 3, 2009
    Fresno, California
    Do the easy stuff first,
    Bleed it as stated before, after you bleed it and give it a try, post the results and we go from there.

    Street Build 561  1

    1997 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

    2K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
  12. Awesomewheeldrive

    Awesomewheeldrive Proven Member

    Joined Feb 6, 2012
    Frankfort, Illinois
    Do you have an fmic? I could see a fmic blocking air from getting to the radiator depending on size of the fmic and if there is still a condenser for the a/c.

    358  0

    1992 Eagle Talon TSi AWD
    · 1G DSM
  13. wranglerunner22

    wranglerunner22 Proven Member

    Joined Jan 5, 2008
    Chippewa Falls, Wisconsin
    My vote is bleed the cooling system. I had that issues right off the bat too.
  14. 007jimmy

    007jimmy Proven Member

    Joined Feb 27, 2012
    Levittown, Pennsylvania
    i have a huge fmic and only one fan and ive never had any overheating issues so i would rule out that. if the motor was rebuild due to a bad headgasket then perhaps the radiator got clogged with the milky sludge that resulted from the oil and coolant mixing. air in the system will also result in a false overheating issue because it tends to collect right at the neck where the sensor is..

    to check for a clogged radiator i would get the car warm and feel around on the radiator. if the bottom or top feels abnormally cool then you have some clogged tubes.. also plus 1 on the radiator cap.. if your coolant hoses dont feel like they have any pressure in them then thats why..

    Street Build 1K  25

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
  15. GSXReHab

    GSXReHab Probationary Member

    Joined Feb 13, 2012
    Baton Rouge, Louisiana
    First I want to say I appreciate everybodies replies. I'll try the new cap and bleeding the system, cause that would be easy, but I'm thinking its gotta be the head gasket, cause i've done most of that. Its a new gasket with arp studs torqued to spec by a Haines Manual diagram but Everything else seems fine. We'll see.:banghead:
  16. DSMnoobsause

    DSMnoobsause Proven Member

    Joined Jun 13, 2010
    Aloha, Oregon
    Is it smoking at all? Have you pulled the plugs and pressure tested the cooling system? If you have a HG leak in the coolant passage then you would see coolant in the cylinders.

    793  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
  17. Moy

    Moy Proven Member

    Joined Mar 2, 2012
    Beach Park, Illinois
    First things first, bleed the system. Jack up the front of the vehicle (and support on stands, chock rear wheels, etc), remove radiator cap, put heat on full blast. start car, let idle until all bubbles are gone.

    If you're still having overheating issues after this, and coolant is still being pushed out of the overflow tank, I strongly recommend doing a block leak test to see if you're getting combustion gasses in the cooling system.

    If you are, well... time for another tear down...
  18. SPOOLISH93

    SPOOLISH93 Probationary Member

    Joined Feb 21, 2012
    Waco, Texas
    You would definitely know if your HG was no good. Smoke would be bellowing out the tail pipe or your oil would be contaminated with water. Also, you could pull your spark plugs to check for inconsistancies in color or cleanlyness, if one looks different from the rest, you know something different is going on in that cylinder.

    A clogged radiator would definitely cause over heating.
    A bad radiator cap would let excess coolant flow into the overflow, BUT a blown headgasket will do the same as it will let combustion pressure into the coolant passages forcing coolant out where ever it can go.
  19. Moy

    Moy Proven Member

    Joined Mar 2, 2012
    Beach Park, Illinois
    Not always, I've seen a few cases where the head gasket was leaking gasses into the cooling system, but wasn't sucking any in. There was no white smoke.

    Also, BHG doesn't always mean that the gasket has ruptured between both the oil AND coolant passages, it can be one or the other. It's more frequent in a lot of vehicles that it blows between both, however.

    Either way, just to rule that possibility out, block leak test the system.
  20. Oneslowgs-t

    Oneslowgs-t Proven Member

    Joined Jan 16, 2012
    Danbury, Connecticut
    Get a new cap. My gsx was running hot one day so I shut if off real fast. I poped the hood and checked the radiator cap and the rubber seal was torn bad.. Waited for the car to cool and went to the autoparts store 30 seconds away to get a new cap. it never overheated again once I put the new cap on.
    Also I only have one fan workimg and havent overheated because of that. Not saying you don't need it because its there for a reason, just saying.

    663  0

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
  21. Moy

    Moy Proven Member

    Joined Mar 2, 2012
    Beach Park, Illinois
    also make sure your engine's under cover (the plastic bit from the front bumper toward the back of the engine bay) is intact. with it missing means that any air coming through the grill will be dumped out before it hits the radiator. sure, air will still be passed through, but not nearly as much as if the cover were in place
  22. 1badpurple

    1badpurple Proven Member

    Joined Jul 15, 2010
    lillian, Alabama
    I had overheating problems on mine due to a bad radiator. Check it for corrosion.
  23. Dan90tsi

    Dan90tsi Probationary Member

    Joined Sep 20, 2010
    Edmonton, AB, Canada
    I agree. I had overheating issues and it was only when i went over 100km/hr on the freeeway. Tried everything and turned out to be the rad.

    884  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM
  24. Kalabalik1

    Kalabalik1 Proven Member

    Joined Nov 8, 2011
    Malmö, Europe
    I have ALL these issues as well.
    I have tried everything, bleeding, changing cap, timing belt, thermostat, water pump, put on an MLS and torqued to spec, cleaned out the coolant system.
    Still no luck.

    Now i also think my radiator is old and clogged.
  25. filabob1

    filabob1 Proven Member

    Joined May 22, 2011
    CHEYENNE, Wyoming
    If you think its a clogged radiator try doing a thorough flush. I've had it happen to me before but after I flushed guess what, bad heater core! I flushed out all the debris sealing the heater core as well, LOL. Also +1 on double checking that radiator cap. Maybe its finally time to get that new race radiator you've been dreaming about! Or is that just me?!?!

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