Guys, having some delimma with my 98 ek... while driving at about 45mph with ac on... headlights on... my temp gauge suddenly goes from normal to 3/4... suspecting of overheat i went to the side to check... seeing nothings wrong... coolant reservoir is ok... rad cap intact... hoses intact... i observed a bit more... til the condenser fan stop means the ac automatically went off then on again... i notice once tge condenser stops the temp gauge goes up... thwn when it runs again thw needle goes down... any idea where could be the problem? Any help would be appreciated...

 

Air trapped in the cooling system. Re-bleed/fill the system properly.

 

Thanks... I will try to re-bleed the system...