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I'm in NW Indiana so I know how cold it has been, but after half an hour, the car should be warmed up unless you had the heater on the max fan and heat setting. If you did, then it would be normal.

Takes my car 30 minutes of city driving/idling to hit full operating temps, details below.

At 5F the other day I remote started my car for 5 minutes before I left, starting coolant temperature was 6F(Heater cold/hot dial was left at max but fan on 1). When I got in the car the coolant was at 95F, turned fan to 2. Drove across town for lunch, got out and remote started my car(let fan on 1), came back 6 minutes later had gained only 10F more coolant temp. Ended up driving/idling around town a total of 25 minutes to hit full operating temps, with 5 minute remote start for a total of 30 minutes to fully warm up.

In the city as long as I was on the gas driving or idling on fan 2 I was gaining engine temp, it was every downhill section or road even at 25mph I would loose 10-15F.

 

[spacedout]

My car used to take forever too. I bought some amsoil coolant boost and it made a huge difference. Plus I leave my heat on recirulate and fan speed on 1. I have plenty of heat after running the car for 10 mins

I interested yet skeptical that anything I could add to the coolant would help it warm up, without some sort of trade off in cooling capacity.

I can have heat in 10 minutes also, just need to head straight out onto the highway at 55mph+.