2004 Ford Taurus OVERHEATING WITH AC ON ONLY

Hi there,

Thank you for the donation,

With the added heat that must be dispersed with the A/C running ensure that the radiator is not part blocked internally, there may be a number of clogged core tubes that are restriction circulation, this problem may only be evident with the added burden of the A/C running, this will need the attention of a radiator shop as the core tubes will have to be checked & cleaned, also ensure adequate air flow through the core of the radiator and the condenser as well, make sure that there is no blockage due to a build up of leaf litter on the core externals, start here.

mark (mhpautos)

It is most likely the radiator hose, i think there are 2 hoses for Taurus , its usually the upper radiator hose that is probably losing pressure having the engine over heat! Engine Overheating can cause quick severe damage to the engines components! when you have the A/C running do you smell coolant? ( coolant smells very sweet.... my Taurus just had that upper radiator hose replaced when i almost blew the engine, it had a leak ( from a crack) on top next to the end molding , i paid 140 dollars just replacing that hose, check to see if the thermostat is froze at a temp or if it is actually functioning? if it stuck on the cluster reading then the hose and thermostat connected with it are both faulty. You can only replace it at a dealer . It will cost yah just about the same i paid for mine 140 bucks but it comes alltogether with a brand new thermostat....Good Luck!