No Heat

[browningejm]

I have done a search, found alot,but still don't get HOT heat.I purged the radiator for air pockets,radiator level is fine,change the radiator cap to 8#, wired open the controls behind the glove box to where they should be for heat,one hose comes from the intake manifold,other hose goes to radiator,both get hot, engine runs at about 200 degrees.Any ideas???? The heater blows only semi warm air, I am at a total loss. btw 1990 5.7 tbi k5. THANX , ERIK.

 

[readymix]

Have you flushed the heater core?
Is you fan turning all the way onto the highest speed?
Is your ducting assembeled correctly with no openings or cracks in it?

 

[2High4U]

I was going to say thermastat but it could be a clogged core

 

[sweetk30]

if you have a laser temp unit measure the inlet and outlet of the heater core. should be 10-15 degre drop from one to the other hose. the last wek at work we have flushed 3-4 cores for plugs and sedement. if you need to garden hose pressure will do. and back flush it 4-5 times with regulare flush 4-5 times. will get all crap out.