Question about Rover 75

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The heater is blowing cold air

Radiator is loosing water

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Coolant system is a closed system. If you are loosing water there is definately a leak somewhere. Check all hoses after filling the system and letting it run until it's warm. Be careful when checking most systems have the water at 185-210 degrees once the vehicle is warmed up. Also check the Heater Control Valve. It allows hot water to travel to the heater core when you set the ac controls to "heat". Could be bad and leaking there. But bad hoses are the most likely culprit. Only takes a pinhole.

Posted on Jan 12, 2013

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Have shop fix radiator leak or if radiator beyond repair replace it and replace radiator hoses and replace thermostat and radiator pressure cap use 50/50 water and coolant.

Posted on Jan 12, 2013

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1)check your oil to see if coolant is going there. maybe look like a malt and foamy if so you may have a head gasket problem. 2) if not there maybe air trapped in system. there should be bleeders around thermostat housing were hose connects. when bleeding air vehicle should be running and this fluid is hot so be careful, slowly open valve and you should have a steady stream coming out, not like a spitting. if spitting that is the trapped air. close valve after steady stream and top off coolant bottle. now you should have heat. (on audi heater hoses by fire wall have bleeder hole where you push hose towards window to let air out)

Posted on Jan 12, 2013

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Posted on Jan 02, 2017

emjem74
  • 162 Answers

SOURCE: we have an audi a4 2.6cc , the heater only blows

sounds like the thermostat is not functioning correctly? either that or not in at all? thus making the water which would normally warm up quickly, warm up extremely slowly and on really cold days not at all? with a 2.6 engine your car shoudl warm up in record time?

Posted on Mar 04, 2009

johnjohn2
  • 5763 Answers

SOURCE: Toyota Celica gts 2000 blowing cold air when heater is on.

nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.

Posted on Oct 06, 2009

  • 23 Answers

SOURCE: my heater does not work, just blows cold air.

it could be a bad thermostat, when the engines warm sqeeze top radiator hose if tight then the thermostat is bad. or could be bad water pump, and last the heater vent door might not be o[pening

Posted on Oct 26, 2009

GasparMacari
  • 166 Answers

SOURCE: heater blowing cold air only

check the heating core or radiator for clogging or leaks

Posted on Nov 25, 2009

  • 174 Answers

SOURCE: When driving, heater blows warm air. When idling, cold air.

It sounds to me like you have a plugged heater core, or one that is beginning to plug. With the engine running, carefully feel the two hoses that lead from the engine into the heater core in the firewall. If one of those hoses is colder than the other one then you heater core needs to be replaced. This involves removing a bunch of stuff under the dash. Sometimes it's pretty easy and sometimes not. Start by removing the glove box and you should be able to see the plastic housing for the heater core.

Posted on Dec 15, 2009

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