dc2 Thermostat changed now over heating.

[seihoa]

So this morning i just changed the thermostat on the dc2 due to the car taking ages to warm up and on freeways it would go back to cold.

So i changed the thermostat now the car is over heating !

First of all i flushed the coolant
Removed the thermostat
Flushed the system with some coolant flush
Refilled everything up
Let the car idle for few min with the bleed valve open so bubbles can come out.
Went for a drive and the car over heats and spits water out to the over flow.

Do i leave the engine idle with the radiator cap on and leave it to bleed till i get a steady stream?
would turning on the heater help?
Reving it?

such a headache.

Also the fan seems to never switch on =(

[seihoa]

Update:
Noticed no coolant is coming out of the bleed valve no more unless i rev the car....

[aaronng]

Leaving the engine to idle for a few minutes to bleed the air out is insufficient. When I did mine, it took over 30 minutes of idling! And the coolant temperature needs to get hot enough so that the thermostat opens to circulate the coolant around. You also need to set your aircon to full hot to get the coolant circulating through the heater core. When you are letting the air bleed out, the radiator cap MUST be only partially on. I left mine off while I let it idle.

[fromdeeeast]

open the bleed valve and turn on the heater

Heater has air in it which is prob causing the problem

[seihoa]

30 min wow so long.
I called up my mechanic and he told me not to even IDLE the car just fill up n bleed !

So i should leave the cap off or partially open and let it idle with the heater max and let it bleed out?

[aaronng]

30 min wow so long.
I called up my mechanic and he told me not to even IDLE the car just fill up n bleed !

So i should leave the cap off or partially open and let it idle with the heater max and let it bleed out?
Yes, you need to let it idle until you the bubbles stop appearing at the radiator cap opening. You can also give the radiator hose a squeeze (while it is still cool-warm) to get the air out of there.

[IEVAQ8]

u need to let the cart idel with heater on and radiator cap off untill the thermostat opens, and u usually let the thermos come on too, that way the water/cvoolant has bleed through the whole system and reached operating temps.....

and dont stress, it will take ages on idle..........but its the best way to do it...

[seihoa]

ok so i left it to idle for ages but still the same issue !!!!
over heats also i notice even when the car temp goes to 80% of the gauge the fan doesnt turn on? Could this be a reason why its over heating?

[seihoa]

also noticed when i stop the car and let it idle the temp goes back down =/

[flipfire]

can you notice any flow in the radiator?

you sure you installed everything as per instructions?

[seihoa]

This morning i bridged the fan wires and drove it to the mechanic fine as it was cold start anyways.

Anyways, the mechanic pluged the fan switch back on n the fans turned on when on idle with the car reving ,but once i drove the car hard it overheated and the fans didnt switch on.
Then we decided it could be a faulty fan switch so we bridged the fans to stay on and went for another run but the car overheated only when driving it hard on idle or cruise the temps went down.

Conclusion is that , fan switch is faulty most likely and the radiator is blocked ( prob due to me flushing the radiator and all the dirty coolant / rust blocked it).

fingers crossed its the radiator and not the water pump as well !

[aaronng]

Also take out that new thermostat and test using boiling water to see if it opens.

[seihoa]

thermo works as the bottom radiator hose is hot so means coolant is flowing right?

[aaronng]

thermo works as the bottom radiator hose is hot so means coolant is flowing right?

No, the thermo is usually located where the top hose meets the engine black.

[fromdeeeast]

Wow sounds like the exact problem I had!!

Are you running standard thermo fans? My guess and I am 90% sure is that your thermo fan is spinning the wrong way. I had the same issue with an aftermarket slim fan, and plugged it in pos = pos and neg - neg which caused to push hot air from engine bay into radiator out to front of car causing it to overheat.

After lots of anger, I figured it needed to be pos-neg and neg-pos causing fan to spin in opposite direction drawing cold air from outside into radiator. After this the car has never overheated ONCE!! NEVER!

Look into this

Best of luck mate

[seihoa]

All fixed !!! radiator place said the radiator was 90% blocked ( mst of been cause of the coolant flush cleaning everything out and blocking the radiator)
also mechanic said fans didnt turn on because the sensor wasnt submerged in hot coolant enough to turn on due to the radiator being blocked.
I still havent seen the fans turn on when driving tho =P but mechanic said on idle it turns on lol