1999 Honda Accord 3.0 v6 coupe Engine overheating

Problem added: May 17, 2010 (10 years ago)
The fault began about after 100 miles of motorway driving when the temperature guage started to flick from mid position to hot and back again . On opening the bonnet It became clear that the cooling fluid had been blown out of the expansion tank . I refilled this and tested the car for about 20 miles the next day on local roads and everything seemed fine . On the return motorway journey the same problem occured after about 110 miles. I have since been driving too work locally about 4 miles in traffic ( 30 mins ) and although the level in the expansion tank has risen about an inch I have had no further problems . There are no visible water leaks and the car does not seem to be losing water.Is this likely to be a head gasket problem ?

Car details
Car: Honda Accord
Variant: 3.0 v6 coupe
Model Year: 1999
Category: Leaks & Noises

Recalls: Honda Accord Recalls
More: Honda Accord Problems
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May 17, 2010 (10 years ago)
Seems the cooling system is pressurising when engine put under load , suggesting head gasket leak . Easiest way to check is to get a sniff test ( block test ) carried out and eliminate that possible cause . A pressure test on cooling system would should any exterior leaks i.e water pump etc . I would start off with these checks first before getting too involved with other possible causes.
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