Washer fluid can freeze in the nozzles of any car. It is a mixture of water and an alcohol (not safe for human consumption). If the washers have not been used in a while the alcohol may evaporate, leaving mostly water, which will freeze. Use a hair dryer or warm (not hot) water to melt the ice in the nozzles. Once you rince through some fluid that has a higher concentration of alcohol your freezing problem will probably resolve. Do not use very hot water as you could crack your windshield.