Questions & Answers for: car heater heats rev engine

...heater will not work unless the vehicle is moving or unless I sit there and rev up the engine? Can you tell me what this might be? Hi it sounds like the water pump has failed hence no heat until you ...

heater won't blow hot air until I rev up the engine a bunch or actually get on the road with it. I could let it just run idle for 30 minutes in the morning and it still won't blow heat until I rev it!

...rev, for 5 seconds or so, every once in a while to make sure flow getting through heater core, and add coolant as necessary. See if that helps, as it may just be an airlock in system. If your cooling ...

car overheating, blows cold air out vents, changed engine,radiator,thermostat,water pump, and heater core A couple of things to check because as you describe your symptoms you actually have 2 problems

...rev the engine a bunch Very likely your heater core is leaking and that's why the floor is wet. The reason you are having problems with the heat is that the coolant level has gotten lower than it is ...

...rev engine the pressure in teh engine increases and water pump speeds up.. Resulting pressure pushes into the heater core past corrosion and clog. Danger here is clog gets worse and heater core ...

...rev engine higher for secound test, heatercore lines going into firewall are hot,still not much heat on high. Maybe vacum leak on controls? British columbia Canada There is air trapped in you cooling ...

...heater core, thus cold air at low RPM. The solution is to open the radiator cap (when the engine is cool or cold), not the antifreeze filler bottle, and sequentially rev the engine to about 2000 RPM ...

...heated fine but heater wouldn't work. Cause? Air in the system. Run the engine with the cap off, rev the engine up and this will help purge the air. Fill as needed and keep check on it for a few

...rev engine my truck had no heat. i flused out heater core and opened my resivior lid and squeezed the hoses.. seen some bubbles but i put lid back on and my truck has some heat now.. i rev the motor ...