My Aux Coolant Pump seems to have died - I am getting 12V supply to it, but no resistance on the motor terminals.

Probably going to be a replacement jobby needed, bit irritating as this now means the heater is a bit naff at low revs and "Rest Heating" doesn't work Thankfully the FBH has its own circulation pump so that still works or I would probably kill myself.

Anyone know if a BMW unit will work? 

dan_uk_1984 wrote:

or I would probably kill myself.

Actually, I'm sure there's a BMW pump that will work. Just finding it... Try from an E53. 
RRC 2Dr, RRC 4Dr,
P38, and 2 L322s
(wife thinks I'm nuts - prob right, too)

SteveMFr wrote:

dan_uk_1984 wrote:

or I would probably kill myself.

Just finding it...

Agreed - none on the bay. I've found a BMW unit for £63, but the LR one is about £75 so may not be worth the hassle.

Dan 

Just to close this one off, my mechanic replaced the pump for me.

Parts and labour came to £90, so not too bad.

Upon further investigation this pump failing is a leading cause of HG failure on older BMW's as there is very little flow in the cooling system at idle and this pump really is needed to avoid hot spots in the heads.

Another thing that can fail are the coolant cross over valves that direct coolant to either the heater, engine or both.

Part Number was JJK000010
Internet price seems to be around £95 inc VAT + Delivery 

Do you know what the procedure is for checking the crossover valves?

I can't find much mention of that side of the cooling system in the shop manual 2008/58 FFRR 3.6 TDV8 Vogue

please dont kill your self DAN, an aux coolant pump really isn't worth that..

I'd just like to thank myself for this post. Whilst researching the aux coolant pump failure on my latest purchase I came across this post which I'd forgotten I'd written!

Even included part numbers and an idea on costs! 

 Ian

hi, where is the aux coolant pump fitted please, so I can test mine (electrically)

In the engine bay...

You'll know if it works or not because if it doesn't then the rest heating function doesn't work (just blows cold) 

hmm, I found it on page 191 in the workshop manual, I have few tinker jobs to do tomorrow between waiting indoors etc, I will find it, and test it.

So far every L322 I've bought has a dead Aux pump...

They do perform a cooling function at low idle speed while sat in traffic on the BMW M62 unit, there are lots of incidents of people blowing head gaskets while sat in traffic due to hot spots in the top of the engine.

Best get mine booked in, being the SC it has two electric coolant pumps.