Last week I was out driving, been on the road about an hour, speed about 70 mph, suddenly after speeding up, revs about 2500/3000, the revs wouldn't drop back down. First thought was what's wrong with my Autobox, so I tried to speed up hoping it would kick in and drop back to where it should be, no joy. I then looked at the temp gauge and it was at the top Red mark - overheated. I pulled over onto the hard shoulder, waited for pick up.

Yesterday I put my OBD on, no codes visable. Turned on engine, ok, then waited for warm up, both fans kicked in. After 15/30 minutes car warmed up, temp gauge at normal position, never moved.

I did notice the in out/in pipes going to the radiator were not both hot. Right pipe( sitting in car) boiling hot, Left pipe luke warm.

Is this a thermostat problem, which case I'll do a new stat, water pump ally upgrade as its still plastic, or something else. Is there an additional Auto Box problem due to the revs issue.

Thanks for any advice
Jagger98

 

Hoses being hot depends how long has the how coolant circulated through the rad and how cold the rad is and how cold air is passing thru, Rad works when inlet is hot and outlet is cooler. If engine seems to overheat and bottom hose is stone cold. Then thermostat may be the issue is it at the bottom hose. But aj-v8 has it on the top hose. Since you still have the plastic stuff there. Start from there including thermostat for the great measure.

 

thank you for your comment, your comment above, are you saying that " aj-v8" ?, presume you mean my jag, its the top hose which identifies a thermostat problem?

Or check the bottom hose for heat

Any recomendations on parts, brand names other than Jaguar.

#Water Pump Aluminium or Stainless steel impeller, body aluminium.
#Thermostat Housing Aluminium
#Water Rail with Sensor, rail plastic, any particular Sensor!

jagger98

 

I like AC Delco for water pump; lots of thermostat available, but while doing this work, also change the drive belt and the crossover pipe that includes the temperature sensor. Same labor -- just do it once.

Be super careful with the thin plastic pipes coming from the reservoir tank -- they are fragile at the ends; they must cross over each other coming out of the reservoir.

 

Yep aj-v8 is the v8 engine on Jags. When thermostat is housed and hosed to the top hose it releases the hot coolant to the radiator.Then lower hose is somewhat cooler becauset radiator is in between.
Aluminium housing
waterpump
For thermostat I would only buy Mahle or Wahler/Calorstat.

 

Can someone please tell me the right coolant, searched the forum and there are so many discussion on it. A definitive answer would be great, I get the importance of no mixing, and definitley flush with dianised/distilled water x twice.

I am changing water pump impeller to ally, if that is a consideration.

Thank you

Jagger98

 

What does your owners manual say to use?
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what im reading on the forum is there is a better alternative, considering I'm changing to Ally water pump impeller. Seen the original is Jaguar D542 or ED, then there are some OAT Coolants that don't protect metal water pump impellers from electrolysis and cavitation erosion, according to forum discussions.

 

Your owners manual would have specified a Jaguar part number for a coolant that was either Dow D542 (colored yellow) or Dow D985 (colored blue/green). But in 1999, Jaguar revised its coolant specification to Extended Life Organic Acid Technology (OAT) coolant meeting Ford specification WSS-M97B44-D (colored orange). See the attached TSB. The most commonly-available OAT coolant that meets this specification is GM DexCool, available at most auto parts stores, Walmart, etc. Prestone, Zerex and others make DexCool equivalents.

One published limitation of OAT anti-freeze is that it does not protect metal water pump impellers from electrolysis or cavitagion erosion. This is the reason that Jaguar and other automakers began using plastic impellers. The last time I checked, Jaguar was still selling plastic-impeller water pumps as replacement parts (these pumps were made by Ford OEM Airtex).

Many of our members have used water pumps with aluminum alloy impellers, and so far, I don't recall anyone reporting a failure due to a lack of protection from the OAT coolant. So it may not be the big deal the automakers thought it was going to be when OAT coolants were introduced.

The one really important thing to be aware of is that OAT coolant should never be mixed with any other type of coolant (conventional green IAT or the modern Hybrid OATs (HOAT) and other variations) due to adverse reactions between the additive packages that can negate properties such as corrosion resistance and can lead to the formation of a precipitate or gel that will clog the heater core and other small passages and will coat the radiator heat exchange surfaces and reduce thermal efficiency.

Cheers,

Don

 

Thank you Don, I found this

# Vehicles that are filled with orange coolant WSS-M97B44-D (base part 19544) are recommended to use yellow coolant WSS-M97B57-A1 (base part M97B57) but will need to flush drain and refill.#

Then this with WSS-M97B57-A1Genuine Ford Super Plus Premium Longlife Anti freeze Coolant 10 Litres

• Recommended by Ford Motor Company; meets warranty requirements
• Provides year-round antifreeze, anti-boil and corrosion protection
• The 50/50 mixture of coolant and treated (purified) water provides freeze protection down to -34°F (-37°C) and boiling protection up to 265°F (129°C)
• Use when Ford Specification WSS-M97B44-D is specified
  • Do not use this product in systems originally equipped with the blue-colored Motorcraft Blue Antifreeze/Meets or exceeds the requirements
  • Available in one-liters bottles as well

• With Optimum Engine Protection For Up To 10 Years
• Ford Specification WSS-M97B44-D
• Contains Ethenediol, Ethylene Glycol
• Need to be mixed 50/50 with water

Not sure if this is the correct Anti-Freeze for your Car?

Contact us with your vehicle registration and we will check for you!

Ford Part Number F2733438

FINIS 2361571/ FU7J-19544-AD has been replaced by FINIS 2733438 / PU7J-M97B57-AA. Vehicles that are filled with orange coolant WSS-M97B44-D (base part 19544) are recommended to use yellow coolant WSS-M97B57-A1 (base part M97B57) but will need to flush drain and refill



Seems to be called POAT now

 

Hi Jagger,

POAT is Phosphated Organic Acid Technology anti-freeze. The Jaguar orange OAT is free of phosphates and silicates, just like General Motors DexCool, and that is what I recommend you use.

Ford has replaced its Motorcraft Orange with the new Yellow coolant, but for your Jaguar the safer product is orange OAT such as DexCool. If you can find the old Ford Motorcraft Orange Extended Life that meets the correct specification, that is also correct.

Coolants are designed with additives selected specifically for the metallurgy, plastics and rubbers used in a given vehicle's cooling system, so even if you were to do a complete system flush and use the Ford Yellow, you could not be certain that all the anti-corrosives and other additives would be optimal in your cooling system, so it's safer to stay with a coolant Jaguar specifically approved for your vehicle.

Cheers,

Don

 

Ok Don, thank you for the advice.

The Ford WSS-M97B44-D I can get, can't get the GM Dex-Cool Extended Life Engine Coolant. I saw somone mention Prestone PAFR0038B Coolant Antifreeze, that's available too.

So I'll keep with the Ford WSS-M97B44-D.

The complete system is 10 litres and engine 3.7 litres, so if i flush it three times,

# once empty from bottom radiator, fill again with flushing cleaner & distilled water.
# second, empty again from bottom of radiator and fill with new distilled water- as much as possible.
# third, empty again, then add Ford Antifreeze 50/50 or a neat Quantity? as the engine will still have Distilled water.

On the fist and second times when i refill, i can measure how much is going back in and take that off the 10 litres, total system quantity.

Thanks Dave, appreciate advice.

 

You can't get Dex-Cool in the UK?
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[QUOTE=clubairth1;2899808]You can't get Dex-Cool in the UK?
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Sorry, shoudnt have said none are available, Vauxhall was our GM, I could find alternative brands, found an Opel Dex Cool ( Blue in Colour) which is GM, Jaguar don't even produce cars any more, we are in a right state?

Dave

 

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I'm pretty sure if you go into any car spares place & ask for orange anti-freeze you get OAT. LRs of a similar age used it too, so it's hardly just Jags it needs to be in stock for.
I don't recall any issue when I had to grab some last year due to a slight leak.

 

Probably been on since new, so 28 years, taking the charge tower out, do you remove the intake manifold?, any ideas on special spanners, the two bolts at the back of the tower are nearly impossible to get on.

 

After sorting out coolant/overheat... revs not dropping could easily be an air leak, not a gearbox issue, so check fuel trims.

 

Ok, thank you, I will check that out when I sort this out

Dave

 

We can buy the right coolant cheaply but not sure we can get that particular brand.