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Front left heating up

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05 Mar 2020 22:01 #219447 by Smith335
Hi Everyone,
Just seeking advice in relation to an odd situation. The front left of the engine bay is heating up quite a bit in comparison to the right side. You can feel the heat in the left panel and bonnet. The issue is new and commenced after not using the Jimny for 6 weeks. Initial drive was fine, but after 10km, sitting stationary and turning the aircon/fan off the revs started creeping to 1800 then to 2400. The revs would drop back to 1000 when turning the aircon on again and then climb back up with the aircon/fan turned off. Only happened earlier this week. But the front left is still hot even after a short drive.

The water temperature appears fine. There is an exhaust smell blowing out to the left of the engine bay with it being considerably warmer there but no noise different than normal.
Power steering fluid is black and the steering is becoming slightly harder to negotiate (my mate told me to toughen up). No coolant loss apparent. Drive belts recently changed with a slight squeak from the alternator. Maybe I damaged something with the belt change?

Any suggestions will be appreciated.

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06 Mar 2020 05:41 #219453 by Lambert
Replied by Lambert on topic Front left heating up
New one on me this. When you say left side you are looking from the front as in the intake side of the engine is getting warmer than the exhaust side?

The high idle is maintained even when under load as in driving with your feet off the pedals?

Dreadnaught (black 2011)

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16 Mar 2020 12:33 #219920 by Smith335
Replied by Smith335 on topic Front left heating up
Hi Lambert,
Thank you for the reply and apologies for the delay in getting back to you. When the problem started, the front left of the engine bay started heating (when seated in the driver's side), the same side as the exhaust manifold. It was quite odd and did this a few times although the temperature gauge never indicated anything other than normal. When feeling the external panels on the intake side, it was significantly cooler.
The problem (as well as the gradual increase in idling) appears to have stopped. I wonder if it was to do with the fact that we were away for 6 weeks and during the time the Jimny sat through a cyclone. I wonder if moisture made its way into the engine bay resulting in the strange idle and whether something temporarily connected the heat shield to the exhaust manifold and conducted the heat this way?
Nevertheless, it appears fine at this stage. Thank you for your input.

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16 Mar 2020 12:46 #219923 by Smith335
Replied by Smith335 on topic Front left heating up
One final thing, in addition to the previous heating issue, and intermittently for a couple of months prior, when standing near the exhaust manifold, a smell of exhaust fumes would linger. Would anyone know where this could come from? There aren't any loud sounds indicating a crack in the exhaust system that I can hear. And yet again, after the most recent drive and sniff, the smell wasn't there.
Cheers.

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16 Mar 2020 15:39 #219927 by Lambert
Replied by Lambert on topic Front left heating up
To find manifold leaks a good trick is to hold a scrap of tissue paper on a long stick and offer it around the exhaust, if it starts fluttering that's a good place to look for a crack or other hole.

Dreadnaught (black 2011)
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16 Mar 2020 16:06 #219931 by jackonlyjack
Replied by jackonlyjack on topic Front left heating up
exhaust/manifold when cold get underneath
Grab the down pipe and see if theirs any movement on manifold joint
The welded nut part on manifold rust through and compromise the seal
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19 Mar 2020 22:30 #220075 by Smith335
Replied by Smith335 on topic Front left heating up
Thank you. I have noticed fragments of rust around the engine mounting point under the exhaust manifold. I will look into it.

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