help please - overheating 3000m

[ian22]

hi there
any advice or help appreciated. overheating probs with my m.- at present running without a thermostat(not too keen on this) this runs at about 90 degrees on gauge but still creeps up in traffic. it has the 2 fan mod on radiator but does not seem to come on till the temp on the gauge is over 125 deg. and only stays on for a short while and not constant enough to bring temp. down and if car is left to run at standstill will go up all the way to 140 deg.not good. any advice - could it be faulty otter switch? or faulty sender unit? - what replacement would be best?
- are 74 deg. thermostats available? poss. bypass otter switch for manual control? anything i am missing?
any info appreciated - newish owner - learning all the time!!!!
cheers all
ian

[ian22]

thanks for the advice,you would think i would know all about overheating having had a stag for 11 odd years,
different beast though.i will get there in the end
i'll try and check these and see how it goes
cheers again