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Engine over heating problem

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Dunc

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  • Name: Duncan Thomson
Engine over heating problem
« on: December 08, 2013, 09:20:08 PM »
  Hi , I have a 2.5 P38 , today on the way to the GRR at Garelochhead on the Kingston Bridge the heater started blowing cold the temp gauge went in to the red and lost power .  This happened 4 more times before I popped the bonnet and with the engine off and a big rag opened the radiator cap , let out the pressure and some water with bubbles , then drove home with a hot heater and a temp gauge that never moved from halfway. Do I have an airlock or a sticking thermostat ? The hoses that go through the bulkhead the left one is warm but the right hand one is roasting ..   Any ideas please    ...     Duncan
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SJF

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  • Name: Stuart Ford
Re: Engine over heating problem
« Reply #1 on: December 08, 2013, 11:05:54 PM »
Thermostat sounds like a suspect I would have a look at the water pump make sure belt is not slipping not sure the set up on a p38 but did it overheat when you were stopped or slow moving ?
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lurch032003

Re: Engine over heating problem
« Reply #2 on: December 08, 2013, 11:50:23 PM »
Easy to check thermostat is pop it into a pan of water and boil it and see if it opens and then closes and opens again but if in doult best to replace especially at thus time of year
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Dunc

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  • Name: Duncan Thomson
Re: Engine over heating problem
« Reply #3 on: December 08, 2013, 11:51:43 PM »
  New belts fitted 4 weeks ago , and I have checked that they aren't slipping , also the temp gauge did not go down when slow running and eventually went down when engine was off .
      Duncan
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Dunc

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  • Name: Duncan Thomson
Re: Engine over heating problem
« Reply #4 on: December 09, 2013, 12:03:15 AM »
   Cheers John I know that trick well but haven't used it for about 20 years , used to be a common problem with Ford 2litre +1.8 petrol ohc (my old man had transit minibuses ) at least you had space to work on them cos the P38 , when I strip it down to get to the thermostat I'm better off changing it ...     although I am hoping to hear more views before the strip down ...
         Duncan
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DRH

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Re: Engine over heating problem
« Reply #5 on: December 09, 2013, 08:57:55 AM »
Check the impeller on the water pump - they have a habit of falling off/breaking off meaning the water doesn't circulate

Duncan
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Dunc

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  • Name: Duncan Thomson
Re: Engine over heating problem
« Reply #6 on: December 09, 2013, 09:07:02 AM »
 :) Will do ... Cheers  Duncan
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Dunc

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  • Name: Duncan Thomson
Re: Engine over heating problem
« Reply #7 on: December 10, 2013, 12:02:02 PM »
 :D   :D  Think I may have a diagnosis and potential cure after speaking with Peter McAnna (Motortune ) who is a BMW trained mechanic , from my verbal description , he has said the 2 hoses that go in to the bulkhead should be equally hot , mine are LH one is much cooler than the scalding RH one then worst case scenario its a heater , with the optimistic solution being a blast out with a power lance to clear potential crud . So fingers crossed a blast out will clean the matrix out ....  :D    :D      Duncan     
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rangerovering

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Re: Engine over heating problem
« Reply #8 on: December 10, 2013, 03:47:57 PM »
Erm use a garden hose not a pressure washer or you will probably get very wet carpets!

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genem

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  • Name: Gene Maxwell
Re: Engine over heating problem
« Reply #9 on: December 10, 2013, 03:54:01 PM »
Lets hope its a cheap one. Not the time of year to get a big bill !

 ;)
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Dunc

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  • Name: Duncan Thomson
Engine over heating problem Joy of joys
« Reply #10 on: December 12, 2013, 05:10:22 PM »
 :D  :D 
                Was off work today so I thought I would flush the heater matrix out with a hose rather than a power washer , and see how I got on .   Well after 40 minutes trying to separate the hoses at the bulkhead from their plastic pipes , making sure I didn't break the pipes , they wouldn't budge . So after swearing at it , bursting knuckles , nails and 3 fingers , I had an epiphany !!  run the engine till it's hot then try
again and lo and behold off they came . Flushed it out against the normal flow and there was a fair bit of crud came out but it ran clear , then flushed it the other way and repeated this another 4 times . Connected the hoses back up , filled it with coolant , started it and bled it . Very quickly the heater started blowing warm then hot . After a 20 minutes run going up big hills en-route the temp gauge never even moved beyond the 11 o'clock position and the heater is blowing piping hot air . When I got back I checked the 2 hoses that go through the bulkhead and they were both equally hot . So touch wood ( hairy wood is the best ) all is working as it should .  Also wondering what the name of the none water coolant is called ?? Maybe Santa could bring me some ..... LOL   

                                                                                                            Duncan
« Last Edit: December 12, 2013, 06:32:32 PM by Dunc »
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Kev91

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  • Name: Kevin Fulton
Re: Engine over heating problem
« Reply #11 on: December 13, 2013, 01:10:04 AM »
Glad to hear that you have hopefully fixed the heating problem, and a cheap fix at that :)

I think the stuff you are talking about is Evans waterless coolant, it isn't cheap IMO and you shall also have to buy the prep fluid as well. Hope that helps
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