2000 Jag S-Type 4.0 Overheating

Tiny
TXHUNTER
  • MEMBER
  • 2000 JAGUAR S-TYPE
  • V8
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
I own a 2000 Jag S-type w/ 4.0- recently overheated on a road trip. I have changed thermostat, flushed system, properly bled air from system, even pulled internal parts from old thermostat to ensure coolant flow through engine. Still within 10-15 minutes of idle temperature gage shoots to how and warning come on dash. I do not see water in oil and the car runs perfect. The fan comes on when it should and adjusts as the temp increases. Also, as soon as I shut car off, wait 3-5 minutes and bleed pressure off expantion tank the temp is back to normal operating range. Is this a major issue with the engine or is it possible to save without selling my house to cover repairs? Thanks!
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Wednesday, July 20th, 2011 AT 3:01 PM

23 Replies

Tiny
DOCFIXIT
  • EXPERT
What happens to TEMP driving? With AC on? Has system been flushed? Condensor/radiator free of debris?
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Wednesday, July 20th, 2011 AT 3:29 PM
Tiny
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Not sure. I know she was driving when it went hot initially.
I have not tried to drive it since it overheats idling. I flushed the engine block and radiator with only little amounts of debris showing. The radiator seemed to have good flow through the radiator itself. But I am puzzled by the fact that relieving the pressure on the expantion tank decreases the temp. Also, as stated I have no thermostat center to restrict water flow at this point. "Hope this helps."
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Wednesday, July 20th, 2011 AT 4:56 PM
Tiny
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Also, did not try to run AC. Hoping to avoid a costly expense if at all possible.
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Wednesday, July 20th, 2011 AT 4:58 PM
Tiny
DOCFIXIT
  • EXPERT
Question is running hot or faulty temp guage. Does it boil over? Have you checked temp of coolant?
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Wednesday, July 20th, 2011 AT 5:04 PM
Tiny
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Definately running hot. Can do a accurate temp check of water this evening if you like.
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Wednesday, July 20th, 2011 AT 5:10 PM
Tiny
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Had the water pump replaced about a year ago. Is it possible that it has gone out again? However, there is no water coming from the "weep" hole or any other indication of failure.
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Wednesday, July 20th, 2011 AT 5:14 PM
Tiny
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BTW, yes it does boil over.
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Wednesday, July 20th, 2011 AT 5:16 PM
Tiny
DOCFIXIT
  • EXPERT
Maybe headgasket leaking exhaust gas into water jacket have a block test done for traces of CO. Can get tester from NAPA for @$40 do it yourself. Does top and bottom radiator become firm when run?
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Wednesday, July 20th, 2011 AT 6:24 PM
Tiny
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Top hose yes, havent felt bottom hose.
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Wednesday, July 20th, 2011 AT 6:27 PM
Tiny
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So, you do not think its the water pump?
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Wednesday, July 20th, 2011 AT 7:35 PM
Tiny
DOCFIXIT
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Pull top hose and crank water comes out pump good
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Wednesday, July 20th, 2011 AT 7:38 PM
Tiny
TXHUNTER
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And if radiator is clogged. Bottom hose will be?
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Wednesday, July 20th, 2011 AT 7:40 PM
Tiny
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Actually, when I had the fill cap off with engine running I didnt see much flow at all. Just vapor and some spitting water, but no good flow of water from the fill area on the top of the engine.
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Wednesday, July 20th, 2011 AT 7:43 PM
Tiny
DOCFIXIT
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That indicitave of head or gasket problem
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Wednesday, July 20th, 2011 AT 8:28 PM
Tiny
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Ouch. Not what I was hoping to hear.
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Wednesday, July 20th, 2011 AT 8:34 PM
Tiny
DOCFIXIT
  • EXPERT
Pull top hose see if flow do block test were not given up
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Wednesday, July 20th, 2011 AT 8:39 PM
Tiny
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OK, I will have to do this after I get off work. Am I to pull the hose at the radiator of at the short piece of hose going into the manifold?
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Wednesday, July 20th, 2011 AT 8:42 PM
Tiny
DOCFIXIT
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What is easier don't need off long if pump good know in a nANO sec
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Wednesday, July 20th, 2011 AT 8:46 PM
Tiny
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Ok, I will be able to check this in about 2 hours.
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Wednesday, July 20th, 2011 AT 9:22 PM
Tiny
TXHUNTER
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Ok. I REALLY hope this is a good thing. I took the top hose off at the radiator and started the car.
I didnt get a drop of water from the motor or the radiator. Yes, everything was topped off and there was water in the hose, but when I started the car. NOTHING! Please, please tell me that is a good sign the water pump is bad. Because it is still under warrenty.
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Wednesday, July 20th, 2011 AT 10:54 PM

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