[Mcnelly]

2008 328i. Brand new water pump last week, worked great for a few days. Started blowing cold air and overheating so I ordered the thermostat and replaced today.. I did the bleed procedure then drove around a few blocks watching temp it would go up and down as if everything was working but hardly any heat from vents. Turned it off let it sit for about a hr, checked coolant it was good. So I start driving again (watching temp) it's going up and down but cold air. I get it home and it starts to overheat again!!!! What could cause this problem?!?

[e91Owner]

Originally Posted by Mcnelly

2008 328i. Brand new water pump last week, worked great for a few days. Started blowing cold air and overheating so I ordered the thermostat and replaced today.. I did the bleed procedure then drove around a few blocks watching temp it would go up and down as if everything was working but hardly any heat from vents. Turned it off let it sit for about a hr, checked coolant it was good. So I start driving again (watching temp) it's going up and down but cold air. I get it home and it starts to overheat again!!!! What could cause this problem?!?

Is it throwing any codes?

[autoart]

What temp is it? Does the fan kick on? I think the fan comes on at 109 deg. celsius.

[Mcnelly]

Originally Posted by autoart

What temp is it? Does the fan kick on? I think the fan comes on at 109 deg. celsius.

So the over heating problem might have gone away but I still have a issue.... in the past 3 days I've bleed the system about 8-9 times and my heater takes forever to get warm. I had to drive it about a hour to get heat

[MightyMouseTech]

Originally Posted by Mcnelly

So the over heating problem might have gone away but I still have a issue.... in the past 3 days I've bleed the system about 8-9 times and my heater takes forever to get warm. I had to drive it about a hour to get heat

Have you scanned the car for faults? Might be a bad water valve to the heater core.

[autoart]

Originally Posted by Mcnelly

So the over heating problem might have gone away but I still have a issue.... in the past 3 days I've bleed the system about 8-9 times and my heater takes forever to get warm. I had to drive it about a hour to get heat

Are you looking at the oil temp. in the gauge cluster or the water temp. somewhere else?

[Mcnelly]

Originally Posted by MightyMouseTech

Have you scanned the car for faults? Might be a bad water valve to the heater core.

I have not, not yet... with that throw a code?

[Mcnelly]

Originally Posted by autoart

Are you looking at the oil temp. in the gauge cluster or the water temp. somewhere else?

I don't have a oil temp so I gotta watch the water temp.. fans will come on around 109-110c but it hardly goes that high I've been sitting around 90-99c with ice cold air.. at idle or interstate speeds..

[MightyMouseTech]

Originally Posted by Mcnelly

I have not, not yet... with that throw a code?

It can, it is an electric valve. It sits on the frame rail just above the left engine mount.

[Mcnelly]

Originally Posted by MightyMouseTech

It can, it is an electric valve. It sits on the frame rail just above the left engine mount.

Any special way to test if it's working properly?

[e91Owner]

You need to scan the faults on the car. Without it, everyone is just guessing. Also, reading the water temp on the gauge doesn't give an accurate reading—you need to use an obd tool with live data.