Reverse Cycle AC

[NorCal Boater]

Hi All,

What a great website. New here and could not find this topic but I'm sure it's been asked. I have an '89 340 DA with the factory installed AC unit. In the summer this thing gets nice and cold. But I cannot get heat out of it. I have let it run for an hour and all it does is blow cool air.

Does anyone have any advice or an idea on where to start?

 

[PMvdb395DA]

Welcome,

Since you are in CA, I don't believe the sea water is too cold :smt001

Water flow is restricted,clear restriction by clean strainer.
Or, dirty air filter, clean lint screen or air filter.​

Maybe your thermostat is damaged....​

Success Peter​

 

[RonF]

Based on age and symptom, the reversing valve in the circulating pipe may be stuck. It is some sort of self contained flip/flop valve. I have heard that you might be able to free it by rapping with a mallet, but I don't know exactly where on the unit. Around the time this happened to us, the compressor also stopped cooling and we replaced the whole A/C unit.

 

[Robski97]

The reversing valve has a solenid vlave attached to it. Locate it . Pull one wire off it while in heat mode and listen for a a loud click. if no click either the solenoid is bad or we are not calling for cooling. If u do here the click. the plunger can be stuck . by pulling the wire on and off u may be able to unstick it ... taps with a mallot along with making and breaking the electical connection will help.... need more help post back .

 

[Robski97]

Sample reversing valve. Sorrry no solenoid to illustrate.

Rob

 

[NorCal Boater]

Thank you all. I will check this weekend.

 

[sr360aft]

Check the thermostat. If mechanical like mine, pop the cover and make sure the screw in the middle has not backed out.

 

[NorCal Boater]

Thanks. I will do that. It is the original 1989.