Thermostat/Heat Question

[Guest]

My car takes a little longer than normal to heat up and once it does I crank on the heat but the engine temp gauge dips back below the normal temp so my heat goes down a little. Once I turn the heat off after a couple minutes the temp. gets back to normal. I'll cycle it like that a couple of times and then eventually everything is running smoothly. I'm basically just wondering if this a thermostat problem or maybe something more?

Thanks

[matthew1]

Screams 'thermostat' to me.

See my fix procedure here:
https://www.matthewsvolvosite.com/tstat.php

Very easy to do.