YOU SAID:

The seat was gostly warm.

INTO JAPANESE

座席は熱く暖かかった。

BACK INTO ENGLISH

The seat was hot and warm.

INTO JAPANESE

座席は暑くて暖かかった。

BACK INTO ENGLISH

The seats were hot and warm.

INTO JAPANESE

座席は暑くて暖かかった。

BACK INTO ENGLISH

The seats were hot and warm.