1998 Pontiac Sunfire Logo
J
JMowery Posted on Oct 25, 2015
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OVERHEATING After replacing the head gasket,thermostat,radiator and water pump,my vehicle is still overheating. I notice it overheating more while driving at slower speeds 25 mph or less.

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Brandon Brown

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  • Posted on Oct 25, 2015
Brandon Brown
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Hi there I am a mechanical technician engineer I fix the things normal mechanic cant! I fix mechanical and electric problem no matter what it is the problem with it!!!I I am very good and bless in my work I am 5gen mechanical engineering technician never have a problem I can not fix if you need anything or more information or any questions you can email me my email address is ([email protected] It may be a creak in the block also have you check out the oil pump make sure that is working right and the o rings on the pistons are wear down and not letting oil cool the cyd. Down it also has a cool temp sin. Thats is out make sure that water pump is working right you can get bad parts

Bill Boyd

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  • Pontiac Master 53,816 Answers
  • Posted on Oct 25, 2015
Bill Boyd
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If it has a viscous fan hub ( fan clutch) the replace it
if it electric fans check them for correct operation

  • JMowery
    JMowery Oct 25, 2015

    Fan is working as well,forgot to mention that.

  • Bill Boyd Oct 25, 2015

    what you did not mention is the fact of what type of fan it has ( electric or pump driven from a drive belt
    while viscous fans appear to be working they have not got a positive drive if they are low on silicon fluid and so at low road speed or at high engine rpms at low road speeds or while sitting at lights, slow moving traffic , hill work at high rpms but slow speeds they will be spinning but not pulling the air through the radiator with the volume required to cool the radiator
    now if you have electric fans then you may have to have a compression test done to check the head gasket
    A major problem with head jobs is that few people clean out the stud holes and threads and tighten down the studs in the correct method and sequence
    if the studs bottom out on oil or gunk in the holes , a full tension will be reached on the wrench but there will not be the clamping action required to hold the head down
    I feel that it is a viscous fan hub problem if that is what is fitted

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