1990 rcsb heater question

[Mythic]

Hello, I am having heater issues. The problem I am having is that the heater rarely puts out any heat. The blower works at all 3 speeds. The button to adjust the temp appears to work, according to the display (the arrow moves back and forth when I push the button towards hot or cold) but does not always light up. The no heat issue occurs wheter the button is lit or not. It's freezing outside and I would really like to get this sorted. Any help would be very very appreciated. Thanks in advance.

I did a search but could not find anything about how to take care of this.

 

[homerun]

Try replacing your thermostat

 

[bow61509]

check your coolant level and as already mentioned try changing your thermostat

Sent from my static android

 

[Mythic]

Tnks guys, I noticed a leak in my radiator this evening as well. I will update this weekend after I get time really look at it.

 

[Mythic]

Rplaced the radiator and thermostat. Had a bolt sheer in the manifold and eventually drilled it and tapped it for a heli coil. Filled it up with coolant and everything is good to go. No leaks and constant hot air. Thanks for all the advice.