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Old 25th November 2021, 21:17   #31
COLVERT
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Originally Posted by ashy90 View Post
My ZT is the same. Hot air on the move, cool on idle. Raise the revs slightly = hot air. I really donít think itís an airlock, gauge stay around half way at all times, even when stuck in traffic.
The gauge should be in the 9 o'clock position and not half way as you suggest.---
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Old 26th November 2021, 12:39   #32
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Originally Posted by slovcan View Post
People who are smarter and more experienced with the 75 than I say an airlock is the likely culprit. Who am I to argue with that? They're probably correct.

The one other thing that comes to mind, though, is the possibility that the heater core (matrix) may still be restricted with the remnants of the goop that was put in to fix the original leak. That stuff is just evil. Some heater cores have smaller passages than radiators. I'd be prepared for another flush - maybe even just the core through the heater hoses and with a cleaning agent or vinegar or something. If the drain/refill process doesn't do the job...

Good luck,
Glenn
I would also suggest reverse flushing the heater core, it often helps clear blockages.
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Old 28th November 2021, 11:59   #33
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I would also suggest reverse flushing the heater core, it often helps clear blockages.
Is that not the matrix, or is the heater core different to the heater matrix?

I do run my V6 with the plastic engine cover off, as it makes the spotting of leaks much simpler.
Would this reduce my running temperature by any significant amount?
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Old 28th November 2021, 14:47   #34
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Is that not the matrix, or is the heater core different to the heater matrix?

I do run my V6 with the plastic engine cover off, as it makes the spotting of leaks much simpler.
Would this reduce my running temperature by any significant amount?
Yes, the heater core and heater matrix are one and the same. It probably doesn't make any difference (negligible anyway) to the engine operating temp. Flushing - and back flushing - may well give you back your heat.
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Old 1st December 2021, 13:42   #35
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Originally Posted by COLVERT View Post
It's a partial air lock.--The raised revs help push some hot air past the air lock.---


The cooling system needs filling correctly.---
Iím not so sure. It was like it when I got the car the car before doing any work, and since I fitted a different engine itís been like it - bled a couple of times. Iíve done 2k miles like it - including some high revs / long distance driving, and also been stuck in traffic for an hour. Temps read normal via diagnostic mode on the dash and via OBD, and the fan kicks in.
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