Poor heat

[E30andy]

Car is running again, weird issue....the fuel pump electrical connection was loose. Just jiggled it and it whirred back to life.

Anyway, back to my heat issue.

So I re-bled the system (didnt help, still only getting not very hot heat at the floor and defroster, cold air through the dash vents), and checked the hoses going through the firewall and they looked good.

I have not tried checking the heater bypass valve, which the previous owner claims is new, but I am getting desperate, so that is my next task.

Any tips on how to check it?

Thanks!!

[E30andy]

Cool thanks guys! Great suggestions!

I will let you know how things go...

No start this morning so I need to figure that out first! Ugh....

[muuris]

Previous owner put in new heater core and valve, thermostat is new as well. I bled the system once, did not make much difference.

First check that the heater core hoses are not reversed. The hose from cylinder head should go to the bottom connector of heater core (near firewall).

[spdracrm3]

Now that its getting cold up here in VT, lack of heat is becoming an issue!


Kind of a weird issue, but here goes:


I seem to be getting decent, but not great, heat to the floor vents and defroster vents, cold air from the center dash vents, and slight heat from the side dash vents.


This is with heater set to max heat, and fan at either 3 or 4.


Previous owner put in new heater core and valve, thermostat is new as well. I bled the system once, did not make much difference.

Temp gauge gets up to just about halfway.


Searching the web, I keep seeing people talk about the "blend door", but I'm not sure what/where that is and how it works.


Any help is greatly appreciated!


Thanks Guys!

Also check for a failed heater bypass valve ,BMW factory recall (usually installed in heater hoses near firewall) they can fail closed or partially closed reducing heat output

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[packratbimmer]

Forget about the blender screw. Pull your top radiator hose and fill the fitting (block) and then the hose (radiator). You can also fill at the top heater hose, but the hose is harder to get to. Fill slowly. Warm the car up a couple of times with the heater valve off. All air should be gone from the engine system. Now warm up and try the heat while driving.

[E30andy]

Now that its getting cold up here in VT, lack of heat is becoming an issue!


Kind of a weird issue, but here goes:


I seem to be getting decent, but not great, heat to the floor vents and defroster vents, cold air from the center dash vents, and slight heat from the side dash vents.


This is with heater set to max heat, and fan at either 3 or 4.


Previous owner put in new heater core and valve, thermostat is new as well. I bled the system once, did not make much difference.

Temp gauge gets up to just about halfway.


Searching the web, I keep seeing people talk about the "blend door", but I'm not sure what/where that is and how it works.


Any help is greatly appreciated!


Thanks Guys!