Menu toggle

Hot engine, but not overheating

Author
kierantrees95
PCGB Member
  • Total Posts : 7
  • Joined: 2015/02/23 18:07:41
  • Status: offline
kierantrees95 PCGB Member
2019/06/11 21:28:27 (permalink)

Hot engine, but not overheating

the expansion tank on my s2 is getting really hot, to the point where I cannot keep my hand on it, but the car is not overheating at all, or the system isnt getting pressurised. Do these cars just run that hot or do I have an issue with cooling.

5 Replies Related Threads

    924Srr27l
    Guest of the Club
    • Total Posts : 1126
    • Joined: 2016/08/18 11:20:00
    • Status: online
    924Srr27l Guest of the Club
    Re: Hot engine, but not overheating 2019/06/11 22:17:46 (permalink)
    yes they do run hot, but is the temp gauge reading ok ? and the fan kicks in when hot?
    Do you have any leaks on the floor, when cooled down is the expansion coolant level going down and needs
    topping up regular ? 
     
    If all the above is ok, and your oil level's good with no discoloured white or cream on the dipstick?> don't worry. 
     
    The plastic tanks do tend to bulge and swell with use, age and the heat it's an extension to
    the radiator which you'd not be able to hold for long either...
     
    R

    www.924srr27l.co.uk
    bmnelsc
    Guest of the Club
    • Total Posts : 754
    • Joined: 2010/07/22 19:51:43
    • Status: offline
    bmnelsc Guest of the Club
    Re: Hot engine, but not overheating 2019/06/11 22:21:50 (permalink)
    If you are confident in your gauge and your levels are OK then I wouldn't worry.  Remember that the system runs about 192F when fully warmed up (both fans running) and even the low temp when the first fan cuts in is around 180F so the expansion tank will be hot.  I don't recall if the expansion tank sees coolant before or after the radiator but even so...coolant is at or above 180 at the top of the radiator.  If you are not pressurized - the coolant will boil at a lower temp (pressurization raises the boiling point) - won't affect the operation of the fans, thermostat, etc. 
     
    I had some problems with my S2 running warm - turned out the fan temp switch in the rad quit working and also had a sudden coolant loss with no obvious source.  The source became obvious after a flush and refill - the O ring under the plastic hose neck on the water pump had disintegrated and coolant started streaming out.  I replaced both the neck and O ring as rumor has it the plastic neck can warp affecting the seal.  The factory O ring is small and fragile so the least bit of warping would cause a leak.  Not sure why a thicker O ring wasn't specified and not sure that you couldn't substitute a thicker one yourself and possibly get longer life out of it.
     

    Bruce Nelson
    91 S2 Guards Red, Blk Script, sunroof delete, no air bags, no cruise
    kierantrees95
    PCGB Member
    • Total Posts : 7
    • Joined: 2015/02/23 18:07:41
    • Status: offline
    kierantrees95 PCGB Member
    Re: Hot engine, but not overheating 2019/06/12 16:56:23 (permalink)
    Both the fans kick in when they are supposed to, no leaks, and not losing any water at all, no issus with the oil either.
    I'm just being paranoid I think. The car runs well.
     
    Thanks for your help both 
    Waylander
    Guest of the Club
    • Total Posts : 1571
    • Joined: 2014/10/21 20:39:12
    • Status: offline
    Waylander Guest of the Club
    Re: Hot engine, but not overheating 2019/06/12 17:52:14 (permalink)
    Clean up the rugby balls and all the connections on the clocks to make sure they are working as expected,
     
    but with a thermostat at 94 degrees and a rad fan switch at 102 it get really warm in there

    1992 Cobalt Blue 968 Coupe
    graham.webb
    PCGB Member
    • Total Posts : 637
    • Joined: 2006/12/05 16:55:30
    • Status: offline
    graham.webb PCGB Member
    Re: Hot engine, but not overheating 2019/06/13 11:41:50 (permalink)
    The plastic elbow off the front of the water pump leaked on my S2 when I first got it....just another optimistic use of plastic I'm afraid. It had lost quite a lot of water before I noticed. When I took it off I checked the plastic flange with a straightedge, and it was bowed, so I flatted it of with emery paper on a wooden block...you'd hope that the O ring and its metal reinforcing ring would do the job but apparently not! It needs to be compressed, and a distorted flange is unlikely to do that well. Thoroughly cleaned and reassembled with a smear of Hylomar, and it was fine.

    Graham
    '91 944 S2: Alpine white
    Jump to:

    Posts made and opinions expressed are those of the individual forum members

    Use of the Forum is subject to the Terms and Conditions

    Disclaimer

    The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

    Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

    When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

    Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

    Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

    © 2019 APG vNext Commercial Version 4.6