Go figure...I have less heat now than before the heater core replacement.I checked all the doors and they are ok..But noticed the heater lines under the hood where crossed.I installed them parallel instead of crossed....Would something like that effect heater output??

 

no. Check that bushing between the blend door and the electric motor. I bet that little bastard cracked in half.

 

Heater core could be airlocked and may need to be bled.

 

What would be the best way to bleed the air out??

 

Ensure the heater hoses are installed correctly. Then I remove the hose from the outlet of the heater. Reinstall it loosely then have someone start the engine, then gently, partially remove until coolant runs from the heater core. There is also an Allen head plug at the front of the head on the 24 vlv engines that can used to bleed the system. I'm not sure if it's there on the 12vlv but I have always used the heater hose method if I need to bleed the heater core. I'm guessing you have the heater hoses installed backwards.

 

Once you get the engine up to temp a couple times, or run it for a while the first time, you will have bled the cooling system. When you fire it up the first time you will hear the gurgling in the heater core. It goes away pretty fast.

 

So the hoses where crossed for a reason.....I placed them paralle because it looked better..I better unhook them and cross them as they where before..

 

I don't know about your 95... On my 2001 the input to the heater core comes off the top of the cylinder head and the two heater hoses do NOT cross so on mine the input is on the inside and the output on the outside. I guess it depends where the take off is on your engine as I think the heater cores are the same. If you have a heater hose coming off the top of the cylinder head in the center, that should be the input to the heater core and it should go to the inside pipe of the heater core. I tried to find a picture of the correct set up for the 95 diesel but couldn't. Hope this helps.

 

The way the lines feed into the heater core are backwards on a 12v to a 24v. On a 12v, the line from the head enters the heater core on the left (passenger side), returns on the right. 24v enters on the right, returns on the left.

 

Thanks for the comments, I seemed to remember them crossing on the older trucks but couldn't be sure.