my mondeo temp gauge takes ages to get to "norm" and as soon as i drive 30/40 mph the gauge goes down to cold and also does it when heater is on, but air comming out of vents is hot ? any idea's
2006-12-06 08:11:40 · 8 answers · asked by Grizley Bear 3 in Cars & Transportation ➔ Maintenance & Repairs
you need a thermostat. it's purpose is to regulate coolant flow through the radiator. when stuck open coolant is constantly flowing through the radiator which keeps the engine cooler and takes longer to heat up. the temperature is dropping when you start driving because there is air going through the radiator and cooling it even more. a normal thermostat stays closed until the temp. gets around 180 to 190 degrees. i would assume the air out of your vents is probably warm but not as hot as it should be, it should be around 140 degrees.
2006-12-06 10:20:15 · answer #1 · answered by whatup 2 · 0⤊ 0⤋
Your temperature gauge is NOT measuring the temp. of air supplied into the cabin.
Cold air passing through the radiator when the engine is not working hard, will cause the needle to drop. The colder the air is, the harder the engine will have to work to get the temperature gauge to respond. As you speed up, more cold air will pass through the radiator. Unless the engine is 'straining', this will REDUCE the measured temperature.
It used to be normal practice to block off part of the radiator (using a metal sheet, or just a piece of cardboard) during cold weather, so that the radiator was less effective at moving heat out of the engine. This allowed the temperature to rise, so that the lubricants could operate at their best.
Nowadays, sophisticated 'cold start' oils should make this kind of adjustment obsolete, but if it's causing problems with the engine's firing, then your garage will be able to sort you out.
2006-12-06 08:42:09 · answer #2 · answered by Fitology 7 · 0⤊ 0⤋
As long as there is coolant in the resevoir and hot air from the vents you have nothing to worry about.
Take the wire off the thermostat and give it a good clean. Must be a bad connection
2006-12-06 08:28:34 · answer #3 · answered by weeebell 1 · 0⤊ 1⤋
Water level is low and there is not enough to circulate the heater where the temperature gauge is.
2006-12-06 08:14:40 · answer #4 · answered by JimboBimbo 2 · 0⤊ 1⤋
Your coolant is low or you need to check the ground wire between the engine and the frame.
2006-12-06 10:31:53 · answer #5 · answered by Nomadd 7 · 0⤊ 0⤋
The thermostat needs chaning its open all the time ,so keeps the engine too cool.
2006-12-06 08:32:47 · answer #6 · answered by Andyp P 2 · 0⤊ 0⤋
either the water level in the radiator or the tempature sending unit is bad
2006-12-06 08:17:15 · answer #7 · answered by Anonymous · 0⤊ 1⤋
sounds like its the sending unit.
2006-12-06 09:02:40 · answer #8 · answered by Anonymous · 0⤊ 0⤋