I have a 91 crx si with a DOHC ZC. My temp gage reads cold all the time in less the temp out side gets above 80 roughly or I am stopped for a long period of time. Its getting cold where I am and my heater barley works blowing luke warm air in less one of the two items above happens. Is something going on with the thermastat or can their be other issues. please help.

 

Read the FAQ: https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/88-91-crx-ef-civic-frequently-asked-questions-faqs-1508680/ It has info on troubleshooting no heat. It also has been covered a million times in the forum. Search and you will find helpful info.