They are not quick to warm up but not dramatically slow either. Is the heater slow to warm up also? Normally any Volvo should have a good heater.
When its good and warm does the needle always reach the same point? A bad thermostat (stuck open) will show low on the temp gauge all the time and the heater will blow cool.
The thermostat is easy to reach and a cinch to replace, down on the lower part of the LH side of the block ahead of the injection pump and fuel filter. Just follow the hoses.
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