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"Should I continue running cleaner through the system?"
Can't say. I have no experience with Jectron (?). But I have seen Techron specified in Volvo scheduled maintenance procedures, and it has a good reputation in general.
The "deposits" theory is just a theory, but I got it from a long-time Volvo specialist. And it seems plausible. This problem always seems to come on as the weather starts to get cooler. Seldom a summer complaint.
" What sensor could the problem be?
Coolant temp? — Maybe the Engine Coolant Temp (ECT) sensor for the FI system (not the one for the temp gauge). It's not easy to access though. For details, look in the 700/900 FAQ (Pull-down FEATURES menu at top of page)
thermo-time? — No, I don't think you have one on LH 2.2
AMM? — Possible, but not high on the list
cold-start valve? — not if it fires right up. You have a cold running problem, not cold "start".
Sorry I can't be more help.
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Bruce Young, '93 940-NA (current) '80 GLE V8 (Now gone) '83 Turbo 245 '73 142 (98K) '71 144 (track modified--and still here) New 144 from '67 to '78 Used '62 122 from '63 to '67
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