Overheating i have a mini cooper s 02 plate. when driving temp gauge went up over half and cold air came out of heater when switched onto hot air.

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Mar 6, 2010 - I too have a 2007 Mini Cooper with heater problems. It now has 96,000 miles and I have just started having this problem. Heater will not blow out hot air bottom or top vents when ideling or low speeds .... Join Date: Nov 2006. Heating not working - mini one 02plate - MINI Cooper Forum
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Heat not working, MINI overheating! - Motoring Alliance :: MINI ...

www.motoringalliance.com > ... > 1st Generation MINI > Cooper S

Ask garage if they removed and water hoses to swap alternator.Needs proper bleeding after draining. Minis prone to water loss and overheats...dont drive till sorted...got a 59 plate cooper in workshop now...needing full engine due to overheats. Very important to bleed properly and pressure test to ensure no leake ( usually fron thermostat housing.

Sounds like the water pump is cavitating . Replace water pump. Check coolant level also. Open the bleeder valve usually located on thermostat housing to remove air from system. close valve when coolant is present while filling. close radiator cap and top off recovery bottle to correct level. These engines are prone to overheating, do not let temp gauge get in the red.

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These details will help.
Thanks.

Sounds Like A Problem With your thermostat. Good Luck

Clarence,
your mini-cooper may just need a new thermostat. if the thermostat in your car is the original, then 4 years is a goodly amount of time for any thermostat to last. Thermostats fail in 2 ways: (A) stuck open, which causes engine to warm really slowly, and (b) stuck closed, causing overheating and
causing the heater to blow cold air - since the heated coolant can't get past the closed thermostat to
circulate through the heater core (a small radiator-like device used to heat the interior of your car).
Your car's thermostat has failed in mode (B).
Your cost: $5-$15 at any auto parts store.
Project complexity: any handy person could teach themselves to replace a thermostat.

most likely is going to be a bad thermostat. when you are moving cold air comes through the grill cooling engine but when you stop you don't have that air and thermostat is not allowing flow causing overheating.

just had same problem with 2000 Buick regal , the thermostat was stuck open just a little , just enough so coolant didn't get hot ,so heater doesn't get hot .. not good on cold mornings !! temp gauge never went more than a quarter, should have been almost half

I had this exact same problem -- for about a year and a half! Replaced thermostat, replaced sensor twice, replaced overflow tank, replaced radiator cap, placed a grounding kit on the car in case the problem was electrical ... and was ABOUT to replace thermostat again and then the water pump when a new mechanic suggested we bleed air out of the cooling system. The heater core was PACKED with air, as was the upper hose valve area. Previous mechanic had been using a pressurized fill device to bleed the system and this had just been backing air into the heater core. There are two valves under the hood for bleeding air -- one on the heater core and one on the upper hose. It only takes a few minutes to fix this!

First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA