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temperature gauge fluctuates between cold & 1/2 while idling

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temperature gauge fluctuates between cold & 1/2 while idling

Postby markfenton99 » Fri Nov 03, 2017 1:05 pm

Started getting fluctuating readings on my temperature gauge over the last week. The problems originally started on my way to work whereas my drive home it was back to normal which made me think it could be due to the cold weather but it has now started playing up while the engine is warm.

Engine seems to be warming up at normal speed and gauge reaches ½, all fine (never goes above ½ so not overheating). While driving the gauge stays at 1/2 but stopping in traffic it will drop to cold or ¼. Start moving again and temp reading rises. Gauge rises and drops all the way to work (45 mins drive in traffic).

I will check to confirm but I don’t think I’m losing heat from the heaters when the gauge drops.

My limited mechanical knowledge points to two possible obvious problems
1) Temp sender faulty. Would be my first thought as the heater stays warm despite gauge reading
2) Thermostat? But wouldn’t this cause heaters to blow cold?

I’ve also noticed that the idle seems a little lumpy when cold and warm, could this be related?
If this is a temperature sender issue could this cause problems ie tricks vehicle into thinking engine is colder than it is so adjusts fuel mixture? If so is it something that needs to be fixed sooner rather than later?
Is my thinking correct? Anything I can do to help diagnose?

This is a 14 reg Transit custom 2.2 diesel

Cheers

Mark
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Gasman82 » Thu Jan 04, 2018 11:59 pm

Hi mark,

Did you get it sorted?

I am having same issues?

Regards
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Altransit » Fri Jan 05, 2018 1:31 pm

Moved to the Custom section.
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Bigranni » Fri Jan 18, 2019 9:22 am

My 64 plate transit doing exactly this any results.
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Frag » Fri Jan 18, 2019 11:31 am

Will need a thermostat,fairly common,
From dealer,the whole housing (including stat) is cheaper to buy than stat itself alone :?
(Oh,and temp sender is included with housing also)
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Stinky851 » Fri Jan 18, 2019 10:46 pm

Just had the identical problem (64 reg 155bhp) repaired by Ford today - new thermostat and housing... All good so far
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Marky M » Sat Jan 26, 2019 11:40 am

Got the same problem. When driving slow in cold weather the temp droppes to 60 degrees.
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https://fordtransit.org/forum/viewtopic.php?f=65&t=189567
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Re: temperature gauge fluctuates between cold & 1/2 while id

Postby Stinky851 » Sat Jan 26, 2019 4:24 pm

I had the identical fault...
New thermostat and housing fitted last week - problem solved..
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