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Re: idles up an down doesnt blow hot air no surculation...
Did you get rid of the air in the coolant after changing the thermostat?
This is often not as simple as just topping it up.
Maybe unrelated to the hunting but it is easy to get an air lock in the heater system resulting in cool air.
These may be the simple diagnosis but..
If you had a blown head gasket then you should smell exhaust from the open coolant expansion cap (open it from cold and leave it open). Bubbles of exhaust will be seen on the water surface if blown.
Otherwise the general level will just SLOWLY rise as the water heats and expands. Note that this may rise to overflowing without the cap on.
Revving the engine will make it rise and fall a little. Sometimes bubbles of trapped air will find their way out when you rev but when cool, a blown gasket will really be definitive by smelling it closely..
If you have had a hot run with a blown gasket and pressure was allowed to build up in the coolant and then let it cool, the next time you start, the water will have squirted back into the cylinder(s) and you will get a cloud of steam from the exhaust.
A bit of a mix of clarification and solutions so let me know what you did!
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bad compressor? (seizing) or
or engine is so weak, at idle (lean), that it cant run your compressor.
the reason for the lope is the ECU idle speed controls going crazy.
id say, the ISC is a victim here.
If the fan is running and the car is really running hot it is a problem
with coolant circulation, either a thermostat that isn't opening fully
(I have seen intermittent ones) or crud buildup in the radiator. I say
really running hot because a defective instrument sender or wiring
problem could cause an incorrect reading.I would suggest
replacing the thermostat first (or removing it for a while as a test) to
see how the temperature behaves, and if it behaves badly a good
radiator flush.When u filled the car up with coolant did u open the bolt to purge the
air in the system.I had a accord that was doing the same thing .the bolt
to purge air on my accord was right beside the thermostat.just a
suggestion with what info u have given. if so It might be the Head Gasket caused the car to overheat.
1st you need to make sure no air in your system open you radaiator cap and your heater to max and see if air bubles or circulation is going on fill up accordingly otherwise you have blockage in your system or water pump if no circulation ////make sure no bubles all bubles should be gone////look for coolant circulation in your radiator make sure your thermostat is not defective or placed in the right position.
Even under acceleration you should have cold air from vents.Does the air change from the vents to defroster or elsewhere when accelerating? Make sure you have a full charge of refrigerent..Also make sure the engine isnt running hot...