I have a 98 with a 5.2. Its staring to get cold out now and went to turn the heat on the other morning and only have about half the amount of heat coming out. The temp is getting up to around 80. I cant find any leaks my coolant is not dropping. Would it be the thermostat? I also took the glove box out and cant see any leaks around the heater core. All of my hoses get very hot except for the bottom one it doesnt even get warm after i have been driving for 20 min. Any ideas what the problem could be?

 

sounds like your heater core is clogged. time for a flush.

 

would that cause the bottom hose not to get hot?

 

Because as stated above, the heater core is clogged. And the coolant is barely getting through.

 

i just had the same thing and yes it was the heater core flush it then try it again

 

Thanks i will try that.

 

What bottom hose are you talking about?

 

I think he is talking about the bottom hose on the rad.

 

If that's the case, it should be cooler then the upper one.

 

Yes I am talking about the bottom rad hose. All the other hoses are very hot the top rad hose and the one that goes into the heater core and the one that comes out. The bottom rad hose does not even get warm at all.