I recently bought a 95 Integra LS with JDM type R swap of everything from front end conversion to the whole RHD dash conversion. My problem is that every time I turn the heater on it only blows out cold air when i turn it to the cold side it just gets colder. Does anyone have any suggestions on where I should start looking? thanks.

 

Check PM messages for a few ideas. I don't want to be wrong and post them up here and give bad information. If any of the ideas actually work, then I'd say post 'em up!

 

Check your anti freeze... If empty, top off. If not, you'll have to replace the heater core!

 

Open your hood, look at the firewall and find two thumb size coolant hoses connecting from firewall to the engine. Make sure they are there and connected. If they are, warm up your engine and turn on heater at full blast. feel both inut and output thumb size hoses and they should be warm. If only the inut hose is warm, either your heater core is plugged or the temp controls not working. If both are not war/hot, there is no coolant flow to and from the heater core. Good luck.

Also, at the end of the input hose (right before it goes into the firwall), there is a on/off coolant valve. Make sure this is working by having someone slight back and forth the temp control and you observe from the engine bay).

 

also try bleeding your coolant system there could be air in the lines happened to me before and it fixed my heating problem

 

OP- Some solid ideas/suggestions have been posted. Check these out let us know.

 

also i have seen the heater control valve located at the heater hose connection at the firewall not switch open, get a buddy and turn your heat on and off and see if the little cable that controls the valve is moving if not, then check for the cable being loose either at the blend door behind the radio or the climate control switch is bad hope this helps -

 

In response to the valve under the hood possibly not moving... In my DD I have this same problem, but the valve moves, just not as much as it is supposed to, I think...

Isn't the valve in the engine bay supposed to rotate 90 degrees from "cold" to "hot" respectively to the climate control slider? Or does that even matter?

 

Ok, I checked everything and both the thumb size hoses under the hood by the firewall is not hot also there is a lever with a cable attached to it that says to the left it is "SHUT" and that wasn't moving so I manually pushed that lever to the right and I felt there was a little heat coming out of the vents. Also should both the hose going through the firewall be hot and which one is the input and which one is the output?

 

The hose with the "on/off" leveler is the input. With the temp sliding control at full hot (the "on/off" leveler at full open) and the fan at lowest seting, BOTH hoses SHOULD be hot when the the engine is at operating temp.

 

listen to hear if the blend air door is working