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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5786
Reply | QUOTE
Re: Head gasket blown


The dual speed fan will always be on when the aircon is on.
Best way to test the fans is to have the aircon off and as the temp gauge rises to operating temp the fans should cut in and out at low speed.
After this is confirmed, disconnct the temp sensor plug and use a 150 Ohm resistor to connect across the 2 plug pins and the dual speed fan should run at high speed. Do this just long enough to test the high speed so that the temp sensor plug is not disconnected for too long. A minute should be enough time to check.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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9/Jan/2021, 8:50 pm Link to this post Send Email PM   Send Private Message Blog
 
Sirkev Profile
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X-TRAIL NEWBIE
 


Date Registered: 08-2015
Location: Yanchep
TOTAL POSTS: 8
Reply | QUOTE
Re: Head gasket blown


You were right Kev.

The temp sensor was not turning the fans on at all. When I disconnected the sensor plug the fans ran at low speed.

I have ordered a new temp sensor and I hope that this is the underlying problem that caused the overheating in the first place. I think that you may have saved me the cost of a radiator upgrade.

thanks for the help.

Sirkev

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Kev
2007 T31 Manual petrol, 17 inch alloys, JVC 12 CD stacker in diamond white.
X-4312
11/Jan/2021, 10:00 pm Link to this post Send Email PM   Send Private Message Blog
 
Sirkev Profile
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Date Registered: 08-2015
Location: Yanchep
TOTAL POSTS: 8
Reply | QUOTE
Re: Head gasket blown


Hi Revhead Kev

IF bridging the wiring on the temp sensor wiring with a 150 ohm resistor results in the running fans turning OFF is it an indicator of a faulty relay?

On a cold engine removing the temp sensor connector turns the fans on. Bridging the connector with 150 ohm resistor turns the fans off.

I am starting to doubt my head gasket hypothesis. Motor gets hot after about 100km at 110km/hr on hot days. I can control it by turning the heater on. Not losing much coolant. About 500ml on a 250km trip when hot.

I cannot do a compression check because my gauge does not have a 12mm adaptor. Motor runs well.

Work done:
Radiator removed and flushed upside down with water. Looks OK, water flows through easily.
New radiator hoses.
New Temperature sensor.
2 New thermostats
Have not yet fitted the water pump I bought.

I did find some scale on the old sensor and thermostats, but the housings and hoses look clean.

BTW the ECU doesn't like it if you remove the temp sensor connector before trying it start the motor. It just starts and instantly turns off.

Sirkev

---
Kev
2007 T31 Manual petrol, 17 inch alloys, JVC 12 CD stacker in diamond white.
X-4312
23/Feb/2021, 7:13 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5786
Reply | QUOTE
Re: Head gasket blown


quote:

Sirkev wrote:
When I disconnected the sensor plug the fans ran at low speed.



quote:

Sirkev wrote:
IF bridging the wiring on the temp sensor wiring with a 150 ohm resistor results in the running fans turning OFF is it an indicator of a faulty relay?



These two points sound as though the relay is a Normally Closed (NC) relay instead of a Normally Open (NO) relay type.
I suggest you pull both fan relays and check they are the correct type.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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23/Feb/2021, 7:42 pm Link to this post Send Email PM   Send Private Message Blog
 
Jdubs88 Profile
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Date Registered: 09-2020
TOTAL POSTS: 8
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Re: Head gasket blown


Hey Ya'll,

I'm another to join the BHG club. Thought I'd share my experience.

So noticed my x-trail ( T30 2002, T30 235,000kms) running pretty sluggish for a while and then coolant reservoir started emptying within a day or so. Never overheated during this time (or could have been faulty temp gauge or thermostat), but eventually started blowing white smoke and running real rough on start up

I took it to a mechanic in here in Brisbane for an o2 test and compression test. I asked for a report on the findings before any work was to commence. No report provided, but just a list of parts required and maintenance was sent (see below):

"Including labour to remove and replace

New cylinder head
Vrs gasket kit
Head bolts
Oil and filter
Coolant
Thermostat
Hose clamps
Workshop supplies (ummm...What!? like gloves mate?!)

Total: $4565"

I thought this was a rather exorbitant price. The point im wanting to make here is that it's always worth getting a second opinion!

I called my family mechanic who we've been taking our cars to for 15 years for advice. He quoted me $3200 with a new radiator. So with the tow from Brisbane to Cooroy (sunshine coast) which was $250 I'm still saving over 1K.

I am yet to get the vehicle back, as our mechanic is always booked about a week in advance, I will report once I know more!

---
Josh W.
Location: Brisbane/Sunshine Coast
2001 Nissan X-Trail T30 ST
225,xxx Km's
Membership ID:X-5914
12/Apr/2021, 10:01 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5786
Reply | QUOTE
Re: Head gasket blown


Replacing the cylinder head in the first quote would have been the main part of that cost.
I would have asked why they thought it needed replacing. Maybe they might have found a crack that your trusted mechanic has not ?

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
13/Apr/2021, 8:27 am Link to this post Send Email PM   Send Private Message Blog
 
Jdubs88 Profile
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X-TRAIL NEWBIE
 


Date Registered: 09-2020
TOTAL POSTS: 8
Reply | QUOTE
Re: Head gasket blown


Unclear if there was a crack in the head, hence why I wanted a detailed report sent of what they found, rather than just a parts list. They did tell me there is was a leak internal, but how do I know they're not just telling me this?

Our trusted mechanic said he can do the same work outlined above for $1000 less. At the end of the day, I would rather send him the work, even if it does cost more.

---
Josh W.
Location: Brisbane/Sunshine Coast
2001 Nissan X-Trail T30 ST
225,xxx Km's
Membership ID:X-5914
13/Apr/2021, 1:25 pm Link to this post Send Email PM   Send Private Message Blog
 


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