I replaced the CTS in my system t'other day, and I'm not getting decent heating like I used to (ie it's not like a blast furnace)

When I brake, I could feel the hot air go freezing cold, and then return to normal. I had this on my MGF and it was an airlock, but didn't think the car would be prone to this, especially a few days after doing it.

Also ... I'm getting a load of steam from the exhaust. No crud on cap though. I'm -always- paranoid about white steam from the exhaust (after a few years with a K-series).

It does sound like either an airlock or not enough water in the system. Have you checked the level and jumped up and down on the front bumper/wing with the cap off??

It does sound like either an airlock or not enough water in the system. Have you checked the level and jumped up and down on the front bumper/wing with the cap off??

It has been fine today, I only do about five miles a day in it. Think it was an airlock!

Assuming it's a Felicia....then when filling/topping off coolant, it helps to squeeze the radiator hoses now and again...plus, removing the temperature sensor on top of the thermostat housing[which should almost be the highest point on the system, [apart from a correctly-filled header tank/expansion bottle]] allow air to escape.....don't loose the O-ring though..or the plastic spring clip!

Run the engine up to temp, and allow to cool, topping up as necessary helps too....