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#4068568 - 06/24/20 04:39 PM Unsolvable P71 Overheating Issue? - Please Help
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
I have a 2008 CVP71 that sat for a few months on a trickle charger and now is overheating.

I have a scan gauge installed so that I can get a better view of the heating and notice that the car gradually climbs to 190 degrees and then almost immediately jumps to 226-230 and pegs the temp gauge.

My first thought was a thermostat, so it was replaced and I verified the old one was bad... unfortunately the car still overheats.

My next step was to do a coolant flush and purge. After flushing, I opened the reservoir, started the engine and let it run for 5-10 minutes (until it overheats) with the heater on high. The air is hot but engine is still overheating.

Next I remove the thermostat and run it without one to make sure that I do not have a second bad thermostat (as unlikely as that would be). Still overheats.

Next I install a brand new radiator (and ECT sensor), do another flush... still overheats and the behavior is the same.

All (that i am aware of) that could be done next was a new waterpump... so I installed that (old one did not leak or whine and moved freely) but still we are overheating.

Did another flush for good measure along with purge but the behavior is the same and i have no idea what do to next.

The car slowly climbs to 190, radiator fan kicks on and within 15 seconds the temp is over 225. Fan runs strong and the right way smile

I have reached my shade tree mechanic capability and would love to hear some thoughts and feedback before I succumb to taking to the shop.

I should also add that there is no smoke, or coolant in oil to make me think a head gasket is blown.

Could the block be clogged or something?


Edited by Chargerrich55 (06/24/20 04:59 PM)

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#4068644 - 06/25/20 01:21 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
TinyTim Offline
Member

Registered: 07/13/13
Posts: 187
Loc: Ohio
All I could think of was head gasket till I got to the end and saw no smoke or water in oil.Even so,I'd say a compression test would be worth a shot
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#4068654 - 06/25/20 01:37 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: TinyTim]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
I have ordered a pressure tester to check head gaskets but i really doubt it.

Would a bad radiator cap cause the overheating like that?

What about the Cylinder Head Temp Sensor?

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#4068712 - 06/25/20 09:18 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
alumarine Offline
n00b

Registered: 02/11/19
Posts: 46
Loc: Manitoba, Canada
Is it actually overheating?
Have you shot the rad hose and thermostat housing with an IR temp gun?

It could be the CHT sensor.
I think that's where it gets the temp from.
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2007 Lincoln Town Car Signature L

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#4068746 - 06/26/20 08:01 AM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
ChrisM_NY Offline
Over the Hill

Registered: 03/01/12
Posts: 1673
Loc: Saratoga, New York
yea a bad cap wouldnt pressurize it, could allow air to get trapped, etc I'd do they're like 5 bucks and you've pretty much done everything else
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2007 CVPI SAP 115K/800hrs

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#4068780 - 06/26/20 04:06 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: alumarine]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19761
Loc: I can see Detroit from here!
Originally Posted By alumarine
Is it actually overheating?
Have you shot the rad hose and thermostat housing with an IR temp gun?

It could be the CHT sensor.
I think that's where it gets the temp from.
That is my guess too. The cylinder head temp sensor and/or its wiring. If it shorts out or the wiring to it shorts to ground the PCM will see it as an immediate overheat and go into failsafe mode. I am also suspicious that it isn't actually running hot and that its a false reading. Checking the temperature with an external temp sensor or thermometer would be a good idea. That's the one good thing about the '92-'05 cars, they have a 2nd temp sensor for the gauge on the dash, so it makes it easy to rule out a faulty reading from one sensor or the other since they should read within a few degrees of eachother.

My co-worker's '05 GMQ did more or less what the OP described when its cylinder head temp sensor failed. Watched it do it myself with a scanner, it would read normally and then suddenly jump to 260*F+ and go into failsafe cooling. It would also occasionally just decide its overheating within a few minutes of a cold start. Being an '05 with its redundant temp sensor for the dash, you could watch the gauge on the dash read normally right up until it went into failsafe mode at which point the PCM lights up the overheating warning, overriding the redundant sensor's reading. There was a definite delay/discrepancy between the 2 sensors and one of them seemed to be reading more logically than the other.
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2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

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#4068786 - 06/26/20 05:51 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
Solved... after a new radiator, water pump, CHT, thermostat, 2 flushes and countless purges... it was my radiator CAP.

The minute I put the new one on, I had a suspicion as the old one immediately clicked in a 1/2 turn (kind of like a gas cap) but with the new one I had to really turn it almost 2 rotations and could just "feel" the difference.

An expensive lesson but with a CVPI with 150km I will just consider the new parts preventive maintenance smile

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#4068852 - 06/27/20 08:55 AM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3126
Loc: Pennsylvania
Yeah sometimes it's the one thing you'd never expected to cause Any serious issue.
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2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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#4069514 - 07/03/20 12:34 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
So it has been a week now and while the temp no longer goes into dangerous temps, it does still seem to run hot (210-219).

I checked again for HG leak with a hydrocarbon tester and it was negative (did it for 3 mins instead of 1 just to be sure).

There is LITERALLY nothing else to replace so either 210-219 is normal (not likely) or I need to just flush and purge again.

BTW I use a scangauge because the dash gauge is about worthless (right in middle at 195 and 219).

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#4069614 - 07/04/20 09:07 AM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
alumarine Offline
n00b

Registered: 02/11/19
Posts: 46
Loc: Manitoba, Canada
My TC was running at 180 all the time with a 6 year old OEM thermostat so I recently installed a new Napa THM 262 thermostat and even in 70 degree weather it was running around 205.

I swapped it out with a new Stant 45779 (192) and now I'm running 190-192 when it's 95 out.

Never know, might be the thermostat.
It's a 10 minute swap.


Edited by alumarine (07/04/20 09:08 AM)
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#4069626 - 07/04/20 11:21 AM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
I did swap out the original with a stant 180 and just purchased an OEM motorcraft 190. I will give it a swap and see what happens.

Seems counter-intuitive but who knows, worth a shot!

I will report back.

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#4069650 - 07/04/20 03:27 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
Replaced thermostat with a 190 OEM Motorcraft, still runs warm 210-215.

Going to go ahead and replace the fan which will mean every single component has been replaced with new unless I am missing something.

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#4069700 - 07/04/20 10:30 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
gDMJoe Offline


Poobah

Registered: 06/03/03
Posts: 7686
Loc: Timbuk3, MI
Quote:
Chargerrich55 ... unless I am missing something.

Did your coolant system flushing include having the heater set to the hottest setting and the blower on high with the engine running?

*Thought being, air trapped in the heater core.


.
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#4069706 - 07/04/20 11:24 PM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: Chargerrich55]
ChrisM_NY Offline
Over the Hill

Registered: 03/01/12
Posts: 1673
Loc: Saratoga, New York
What about the fan controller mounted on the fan assembly, looks like many choices on rockauto comes with the control module
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2007 CVPI SAP 115K/800hrs

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#4069758 - 07/05/20 11:29 AM Re: Unsolvable P71 Overheating Issue? - Please Help [Re: gDMJoe]
Chargerrich55 Offline
Stranger

Registered: 06/18/20
Posts: 7
Loc: Kansas City Area
Yes, all three times. I do not believe its air in the system at this point and i know its not HG.

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