What is the hose that runs from the transmision to the radiator called on a 1 991 mercury gr. m arquiss? ds_moss@sbcglobalnet.

The temperature switch on the side of the upper radiator hose is not working. That is, if the engine is hot. Boiling over - need to check thermostat. Grab on to upper hose (should be hot) than with engine off, grab bottom radiator hose. It also should be same temperature as top. If so, thermostat ok. Electric radiator fan - turn Ac on. Fans should run. No, check fuses & relay. Mechanical fan - with engine off, the blade should be stiff to turn. Easy, replace fan clutch. Usually, low level of water is most common. Wish you well.

If it is a hose on the battery then it is a vent.

Bottom radiator hose is sufficient.

A radiator hose that swelled up is caused by the hose breaking down, we call this a "soft hose" and it must be replaced ASAP. As far as the high idle goes this is caused either by an engine vacuum leak or a defective automatic idle speed control valve. You need to have the dealer run some basic testing with a tool called a scanner to see what is going on.

• Lower radiator hose.
• The one that runs from the thermostat is the upper radiator hose.

• Hope this helps. Thank you for using FixYa.

Regards, Tony

Radiator cooling fans not running? Blown head gasket? Cracked cylinder head?

should be at the bottom of the rad with a little hose coming from it .(the hose points down and goes nowhere just ther to help drain) if you cant find it you can also pull the bottom rad hose off and drain it that way.

that would be your heater core hoses
and if I remember correctly the aftermarket parts are cut-to-fit and the factory parts are only available as an assembly

the hose will leave from the top of the radiator into the bottom of the exspansion tank