Odd temperature stuff

[Adamal]

After taking the engine out to raplce clutch/cam and some other things and putting it back in, I've noticed that when my heater in the cockpit is set to cold, the temperature rises from cold quickly.
If I then slide the heater towards hot, the water temp drops and slowly builds up again. The rate at which it drops depends on how far along to hot I slide it.
I'm guessing this is due to the heater system being seperated from the cars cooling system when the slider is at cold, but something odd happened today.

I was driving along, and decided to slide the heater up a bit, as I usually do to stop it from getting to 'normal' operating temp too fast (ECU will go out of cold mode prematurely).
But it stayed at the same temp and there was no heat coming out of the heater.
So I slid it all the way to full temp and still no change in the water temp and still no hot air.
It sat like this for a while, about 5 mins and then all of the sudden, the water temp dropped and heat started coming out of the heater.

Would I be right in assuming that theres something clogging the system and it needs a good flush?

Cheers guys!

[kingcorolla]

thermostat.

[AE85coupe]

yeah this wee magical device known only as a thermostat will do that dude

[RedMist]

I'd say your just working air bubbles out of your water system. Sounds like its not bled correctly.
And of course I'll replicate what everyone else here has put and insert "Thermostat" here..... thermostat.

[Monsterbishi]

Since everyone has already said change your thermostat, I'm gonna have to go with:

"Change your windscreen wipers" - It's blatantly wrong, and completely unhelpful, but it's early, and I need to post something.

[Adamal]

Cool. New windscreen wipers on order from Toyota.

Thanks guys!