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#1
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No Heat
'07 X5 4.8i N62. No heat coming from either passenger or driver side vents, only cool air. Here's what I've checked / done so far:
Here's what I'm going to try next:
Last edited by LightlyToasted; 11-24-2022 at 06:14 AM. |
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#2
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Hmm, the internals of my old heater control valve don't look like this one: https://www.bimmerfest.com/threads/d.../post-11207073
That one has a torn seal around the valve which is missing from mine entirely. Now I'm wondering if my seals were torn up and went downstream to block the heater core. |
#3
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Try reverse flushing the heater core.
__________________
Sent via Telegraph Wires using my Morse Key. 2015 X5 xDrive35i MSport 2013 X5 xDrive35i |
#4
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Had similar issue last year with no heat on 09 E70, replacing the valve did the trick, sorry that didn't work. But saw your ISTA comment with no comm to modules, ran in circles until I found what it was, be sure latency is set to 1. Open “Device Manager”, then USB Serial Port properties, go to “Port Settings” tab and click
“Advanced...”. Change latency timer to “1” |
#5
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Quote:
Thanks - I'll check it out, but it's only some of the modules that ISTA cannot communicate with. For my no heat problem, I'm beginning to suspect the auxiliary water pump. I'll get some heat after a 1/2 hour drive as if only a minor amount of coolant is making it to the heater core. Also, I cannot hear the pump when I activate heating in "rest mode". Before I dig through the wheel arch to get to it, does anyone know precisely when it's supposed to be on? I'm expecting +12V when calling for heat and in rest mode. |
#6
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Don't recall an aux pump in my 09. Been a while since using ISTA but should be able to test the pump when going through troubleshooting. If seals did go downstream and causing blockage could removing hoses 5 and 6 then back flushing through 7 blow them out?
https://www.realoem.com/bmw/enUS/sho...diagId=64_1591 |
#7
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Quote:
I'm thinking that if the aux pump isn't pumping then it would impede any natural flow to the heater core. Therefore I think that pump has to be on for any coolant to flow to the heater core. I'm going to check that pump first before back flushing the heater core. It looks like a bit of effort to get to the outlet. |
#8
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Same comm error until I checked ISTA settings and latency issue.
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#9
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I would think '07 and '08 would be fairly similar, but I didn't have to dig through the wheel arch to get to the aux pump. I had ok access in the engine compartment. I can't tell you when specifically it turns on, but if you hold accel pedal down with ignition on (engine off), it'll kick on. Supposed to help you bleed coolant. I could hear it run, but a hand on it will certainly be obvious if it's on or off.
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'08 X5 4.8i - 173k '15 i3 - 76k '98 323is - 169k - Garaged '94 325i - 208k - Sold |
#10
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Quote:
I think I have a similar if not exactly the same problem. 2009 N62 V8 here. But my biggest suspicion is the electric flaps that regulate the air flow. Because my vents barely blow any air even when the fan is set to max, but after driving for some 15 minutes the car does warm up. So it can't be the valve, can it? |
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