My heater is blowing cold a man mended it but as soon as i turned the blower off and then on when i started the car up again it was cold i just wondered if you could tell me what the man did and i can do it myself thanks christine from castleford

Sounds like you might have a low coolant level. I would verify that the cooling system is full and bleed out any air that might be in the system

If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. The following are some issues that may be causing the heater to blow cold air:

• Low coolant levels
• A plugged/clogged heater core
• A faulty thermostat (thermostat that is stuck)
• Broken blower and/or blower motor
• Heater core bypass hoses that have leaks
• Heater core bypass hoses that are worn

If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible.

If you are absolutely confident the AC compressor is not kicking out on low pressure then it is the blend door actuator.

The blend door determines how much air blows through the heater core or evaporator.

The actuator can be purchased at dealer and maybe at a local part store.

leave the coolent cap off the resevior and run car up to temperature this should get all air from the system BE CAREFULL U WILL GET BURNT!!! STAND WELL BACK AND BE READY TO SHUT ENGINE OFF as soon as the coolent starts to bubble turn engine off and leave to cool before replacing cap, start engine again with cap on drive for a little while untill the temp gauge shows warm and check that the fan in engine bay is working have heater blowers in car on all the time whilst doing this operation!

Sounds like a clogged heater core- insufficient coolant circulating through heater core, and as soon as you blow air past the core, it get cooled off.

Your heater core may be clogged

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

check blower motor.. give it a tap when you start the vehicle and turn on the heat.. if it come on then you would have to replace the blower motor..if it does not check for fuse..

Sounds like a thermostat sticking. Some things to do. First check coolant level is up and moving. Second (most likely), change thermostat. Very easy fix for backyard mechanic. Make sure to put thermostat in so water flow is correct direction. Look for arrow on side of thermostat. Next, is belt to water pump loose. Another easy fix in most cars.

Sounds like your auto climate control module.