Broken heat pump

Submitted: Friday, Nov 23, 2012 at 21:38
ThreadID: 99159 Views:2715 Replies:3 FollowUps:9
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Hi all,
Had a call from Daughter about Her navara telling Me the heat pump is broken and needs a new injector plug. Cost of repairing $2.500.
Can anyone explain what a heat pump does ,ie heat exchanger,She doesn't know what a injector plug is ,would that be fuel injector ,all sounds vague to Me. Mechanic not very helpful in explaining problem. Would this seem to be an expensive fix.
Thanks for any response . Cherry.
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Reply By: pop2jocem - Friday, Nov 23, 2012 at 21:53

Friday, Nov 23, 2012 at 21:53
Hi Cherry,
Not sure what your daughters mechanic is calling a "heat pump" but I have heard of the system refrigerators use being referred to as a heat pump. Maybe get the mechanic to put the whole lot in writing and explaining the problem as well.


Cheers
Pop
AnswerID: 499096

Reply By: Ross M - Friday, Nov 23, 2012 at 23:15

Friday, Nov 23, 2012 at 23:15
I would be concerned the mechanic doesn't know the common terms of automotive components. Although the airconditioning compressor pumps gas and could be called a heat pump I suppose. As for an injector plug? never heard the term in relation to vehicles.

I agree with pop above, some definite clarity as to what is meant is most important otherwise it is just $2500 for something that no one can identify..

Heat pumps, injector plugs? Sounds suspect to me. I have been in the business of explaining technical automotive systems for 40 years and I have no idea what he means.
AnswerID: 499101

Follow Up By: olcoolone - Saturday, Nov 24, 2012 at 08:07

Saturday, Nov 24, 2012 at 08:07
Injector plugs are what plugs into the injector on modern electronic controlled fuel injected vehicles, the electronic signal is what opens the injector.

Pretty common term......

http://www.efihardware.com/products/c194/Injector-Plugs
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FollowupID: 775066

Follow Up By: Ross M - Saturday, Nov 24, 2012 at 18:37

Saturday, Nov 24, 2012 at 18:37
I notice some people call that item, injector plugs.

Most are written up as a connector. Just happens to plug onto an injector. Others same as or the same concept plug onto thermo sensors, airflow sensors and the like.

To me, an injector plug is a plug which injects, not the wire connector which feeds the thing which injects.
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FollowupID: 775098

Follow Up By: olcoolone - Sunday, Nov 25, 2012 at 11:28

Sunday, Nov 25, 2012 at 11:28
A connector or a plug..... depends what it is used for.

A connector could also be a bolt, a mount or a strut of some description.

More common is terminal.

How do you get "an injector plug is a plug which injects" ....
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FollowupID: 775144

Reply By: olcoolone - Saturday, Nov 24, 2012 at 07:57

Saturday, Nov 24, 2012 at 07:57
I wouldn't be blaming the mechanic just yet.

We have customers come in saying they have been told this is broken and in some cases things we have never heard of before only to find out from the original repairer it's something else.....

Or the other classic is "it was only done 4 months ago"..... only to find out through service records it was done 3 years ago..... Or "they replaced everything and it cost me $300.00", when to replace every thing it would of cost $$$$.

Surprising how customers can get so confused and call things something else no matter how much you explain to them what it is.

It's almost like they (the customer) find another word similar in there brain and it defaults to that.

And cherrywipe.... it would be nice if you provided a bit more information on the vehicle..... year, model, engine.

They also have a tendency to get prices confused.

Have you spoken the the mechanic yourself?

So if you must; it's OK to blame the mechanic.... we have broad shoulders and I'm sure doctors have to cope with the same.



AnswerID: 499103

Follow Up By: olcoolone - Saturday, Nov 24, 2012 at 08:18

Saturday, Nov 24, 2012 at 08:18
Just had a thought...... are you sure the mechanic is not talking about the diesel particle filter (DPF) and the injector to inject fuel down the exhaust pipe for burn off are we.

I take it's a 2.5lt D40 Navara.
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FollowupID: 775068

Follow Up By: pop2jocem - Saturday, Nov 24, 2012 at 10:47

Saturday, Nov 24, 2012 at 10:47
"the injector to inject fuel down the exhaust pipe"

Are we talking about a Navara or an F-18 Hornet???...lol
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FollowupID: 775073

Follow Up By: steved58 - Saturday, Nov 24, 2012 at 12:25

Saturday, Nov 24, 2012 at 12:25
If the mechanic was to have written a quote then there would be no confusion as to what work was being advised of being performed and what cost ask for a written quote if he cannot or won't give one go elsewhere and then knowledgeable people such as olcoolone can help you without having to guess as to what may or may not need to be done
Steve
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FollowupID: 775075

Follow Up By: olcoolone - Saturday, Nov 24, 2012 at 19:35

Saturday, Nov 24, 2012 at 19:35
pop2jocem.....

This may explain it.....

http://www.youtube.com/watch?v=9wrcMHqK8_A

DPF can burn up to 700+ deg C and glow bright red when rejuvenating.

About 3 years ago when the big fires went through Port Lincoln it was traced back to a petrol vehicle with a catalytic converter caused the fire from the 400 deg C the converter runs at....... Some of our service van were doing maintenance and repairs on heavy earthmoving equipment around SA at the wind farms..... they banned all petrol drive vehicles from the sites due to the chances of starting a fire from the converter and only allowed diesel powered vehicles on site that we operate.... little did they know DPF's burn hotter than catalytic converters..... so our diesel vehicles posed more of a fire risk then the petrol vehicles.
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FollowupID: 775099

Follow Up By: olcoolone - Saturday, Nov 24, 2012 at 19:41

Saturday, Nov 24, 2012 at 19:41
Heres another two I found....

http://www.youtube.com/watch?feature=endscreen&v=1XcKDTwXheA&NR=1

http://www.youtube.com/watch?v=fNO-oUHmKXU&feature=related
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FollowupID: 775100

Follow Up By: pop2jocem - Saturday, Nov 24, 2012 at 20:43

Saturday, Nov 24, 2012 at 20:43
olcoolone,

Your right the DPF gets awfully hot while burning off the particles that they collect.
The new generation of Isuzu trucks do what they call a "regeneration cycle" every 200 k's or so. If being driven at reasonably high load or engine speed they modify the air fuel ratio and delay the injection sequence to raise the exhaust temperature and burn off what may collect in the DPF during low speed/load conditions. Apparently they can generate up 900 degrees C. If idling and the pressure drop sensors detect a blocking DPF the air flow is restricted, the idle is increased and the final injection point is delayed further thus increasing exhaust temperature until the pressure drop returns to normal.
All this may be of some interest to you and I but the PO's eyes are probably starting to glaze over... lol (;-))

Cheers
Pop
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FollowupID: 775102

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