Hey all....

I have a Mk3 J plate Golf 1.8 cl, the engine was overheating in traffic
but not when driving normally. So I changed the thermo switch in the
radiator - no change! I then drained the system and changed the thermostat
and the water pump. After filling with water (thought i'd test with water
in case i had to re-drain if there were any leaks)the temp gets to 110 C
without the fan cutting in, hotwired the fan and ran it constantly but
this made no difference, top rad hose is nearly melting, bottom is still
cold...water seems to back up and bubble out of the water resevoir??

I would really appreiate any advice! Thanks

"Sharkman" wrote in message
lkaboutautos.com...
Hey all....

I have a Mk3 J plate Golf 1.8 cl, the engine was overheating in traffic
but not when driving normally. So I changed the thermo switch in the
radiator - no change! I then drained the system and changed the thermostat
and the water pump. After filling with water (thought i'd test with water
in case i had to re-drain if there were any leaks)the temp gets to 110 C
without the fan cutting in, hotwired the fan and ran it constantly but
this made no difference, top rad hose is nearly melting, bottom is still
cold...water seems to back up and bubble out of the water resevoir??

I would really appreiate any advice! Thanks


try backflushing the radiator with a hose pipe.
and flush the rest of the engine the same way.

Marc

Bad thermostate. Cold bottom hose indicates that there's no water
circulating through the radiator.

SFC

"Sharkman" schreef in bericht
lkaboutautos.com...
Hey all....

I have a Mk3 J plate Golf 1.8 cl, the engine was overheating in traffic
but not when driving normally. So I changed the thermo switch in the
radiator - no change! I then drained the system and changed the thermostat
and the water pump. After filling with water (thought i'd test with water
in case i had to re-drain if there were any leaks)the temp gets to 110 C
without the fan cutting in, hotwired the fan and ran it constantly but
this made no difference, top rad hose is nearly melting, bottom is still
cold...water seems to back up and bubble out of the water resevoir??

I would really appreiate any advice! Thanks

Marc wrote:
"Sharkman" wrote in message
lkaboutautos.com...

Hey all....

I have a Mk3 J plate Golf 1.8 cl, the engine was overheating in traffic
but not when driving normally. So I changed the thermo switch in the
radiator - no change! I then drained the system and changed the thermostat
and the water pump. After filling with water (thought i'd test with water
in case i had to re-drain if there were any leaks)the temp gets to 110 C
without the fan cutting in, hotwired the fan and ran it constantly but
this made no difference, top rad hose is nearly melting, bottom is still
cold...water seems to back up and bubble out of the water resevoir??

I would really appreiate any advice! Thanks



try backflushing the radiator with a hose pipe.
and flush the rest of the engine the same way.

Marc


Yep, sounds like a blocked radiator, unless your new thermostat is faulty.

"Sharkman" wrote in message
lkaboutautos.com...
Hey all....

I have a Mk3 J plate Golf 1.8 cl, the engine was overheating in traffic
but not when driving normally. So I changed the thermo switch in the
radiator - no change! I then drained the system and changed the thermostat
and the water pump. After filling with water (thought i'd test with water
in case i had to re-drain if there were any leaks)the temp gets to 110 C
without the fan cutting in, hotwired the fan and ran it constantly but
this made no difference, top rad hose is nearly melting, bottom is still
cold...water seems to back up and bubble out of the water resevoir??

I would really appreiate any advice! Thanks

I had similar symptoms and the cure was to replace the cap on the expansion tank
No guarantee it's the same problem with your car though.

Thank for the above, I'll try these today. I've also had it suggested it
may be the cylinder head gasket....does it sound like another possibility
with the symptoms?? Thanks

Thank for all the advice, excellent site!!
Flushed radiator, ran with no thermostat, hotwired fan again....then
looked at the expansion tank cap, the o-ring was in the wrong place
somehow??? Now it seems to be running fine, no overheating, engine sits at
about 88 C and the fan cuts in at about 90 C. I'll replace the cap with a
new one on monday just to be sure!

Thanks again, have a legend day.