can a dirty radiator cause my honda cr-v 1998 to bubble in the top radiator hose and reservior
It would have to be more than just dirty, clogged yes. Check your oil and see if it looks right, hopefully it's not a tan/milky color. That would be baaaaad. A stuck thermostat will. Does your car overheat?
could be a leaking head gasket.
No the vehicle is not heating
air bubbles appearing in the reservoir will generally come from a leaking head gasket or boiling coolant.
Looking for a Used CR-V in your area?
CarGurus has 62,122 nationwide CR-V listings starting at $1,495.
Search Honda CR-V Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Honda CR-V Experts