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Overheating issue - Airlock?

 
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Tiger Tim




Joined: 22 May 2007
Posts: 210
Location: Ireland
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PostPosted: Mon Jun 25, 2018 9:23 pm    Post subject: Overheating issue - Airlock? Reply with quote Reply with quote including images

Hi All,

I've my MK1A for 10 years now & have changed the coolant a number of years ago with no issues. Yesterday I was driving to a show. Weather was very hot. After about 50 miles the temp gauge shot up into the red having been sitting in the middle for all the journey up to that. I quickly pulled over & switched off. Was driving at about 50mph at the time. Radiator did not feel very hot & coolant in the bottle was just above max. No fans running. I restarted the engine & slid heater to hot. Immediately the temp returned to normal. I drove on the last 10 miles to the show with the heater on & no issue. I tested turning off the heater & immediately the temp started to rise.
For the journey home I put the rad fans & the engine bay fan running continuously & gauge sat just below the centre point. Engine temp didn't rise & weather was seriously hot & hot inside car with heater on. About 5 miles from home I turned off the heater & the temp gauge didn't budge.
I've searched for this issue on the forum & it looks like it could be an airlock or possibly the thermostat,

Anyone got any suggestions. Had trouble with a faulty gauge a few years ago but when this reacted when I put on the heater, it's probably OK.

Tim
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Tiger Tim




Joined: 22 May 2007
Posts: 210
Location: Ireland
Feedback Score: 0



PostPosted: Wed Jun 27, 2018 9:57 am    Post subject: Reply with quote Reply with quote including images

Update - I removed to filler cap this morn & there was a large "burp" from it. Coolant looks low looking in thru' filler. Must get some coolant.

Anyone got any suggestions. Bleed the system?.

T.
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jimi




Joined: 14 Dec 2004
Posts: 2070
Location: Kingdom of Fife
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1988 Toyota MR2 Mk1b

PostPosted: Fri Jun 29, 2018 8:09 pm    Post subject: Reply with quote Reply with quote including images

Sounds like an airlock to me, I'd go with bleeding the system. Might be worth considering this method http://myweb.tiscali.co.uk/jimilawson/Various/Cooling/Cooling.html its always worked for me [Wink]
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markstevieandmads




Joined: 05 Aug 2013
Posts: 2025
Location: Swindon, Wilts
Feedback Score: 5

1993 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Fri Jun 29, 2018 8:35 pm    Post subject: Reply with quote Reply with quote including images

Thermostat stuck closed?
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Tiger Tim




Joined: 22 May 2007
Posts: 210
Location: Ireland
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PostPosted: Mon Jul 02, 2018 2:17 pm    Post subject: Reply with quote Reply with quote including images

Thanks for the replies.

I bled the system over the weekend. Was a good bit of air in it. Think it's all out now. No gurgling to be heard.

Went for a spin last evening and temp gauge sat just below normal. Heat never rose. Hopefully solved.

Thanks for the help,

T.
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SonicSW20




Joined: 29 Nov 2010
Posts: 3572

Feedback Score: 12

1997 Toyota MR2 Mk2 NA Rev4

PostPosted: Mon Jul 02, 2018 2:26 pm    Post subject: Reply with quote Reply with quote including images

Great you sorted it.

Monitor it closely - you may have a very slow leak somewhere.
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