My 92 ranger seems to only blow lukewarm air now. I blew out the heater core as that was the culprit last time, but still the same result. The temp guage fluctuates from 1/4 to 1/2 gradually.
I wonder if the cold air intake I put on had anything to do with it. There is a intake air heater that went into the bottom of the stock air box that is vacuum operated that i just plugged the vacuum port after I put the CAI in. Could that cause the heater issues?
Thanx

 

Crap, sorry, 1992 ranger ext cab 4.0l 4x4 mt with ac
Thanx

 

You don't need a cold air intake. The intake is related only because you messed with it. Either you disconnected something, thermostat is not working right, or the core is plugged.

 

NO HEAT Troubleshooting Guide - Ford Ranger Forum

 

Craziejoker, your lukewarm heat issue may be from having too much air trapped in the cooling system since you opened it up. You can help get the air out by keeping the radiator full of coolant. Fill it up to the bottom of the filler neck just below the cap, when the engine is cold. Then after you have driven the truck for a while, (10 miles or so on the highway) or run some errands, let it cool off a while and then check the coolant level again to make sure it's still full like you had it. It needs to be full so it will help push the air out of high spots in the system (like the heater core). The other thing that helps is to have a good working thermostat of the correct heat range (195) installed. If you're not sure of it's condition, then it may not hurt to change it out with a good OEM quality thermostat. That's usually all I have had to do with my 91 4.0 if I have any heat issues. Usually it will run me out with heat even if it's 10 degrees or less. Some of the other suggestions you find here can be of benefit too. Let us know how it goes.