water circulation issue! NO HEAT NOW FROM HEATER/DEF.

[hokie8358]

NEED MAJOR HELP ON THIS ONE SINCE ITS WINTER TIME!! JUST SWAPPED IN A BUILT CHEVY 502CID MOTOR FOR THE TIRED WEAK
6.2 DIESEL! I JUST PUT IN A BRAND NEW 180 THERMASTAT IN WATER NECK AND TOPPED RADIATOR OFF WITH 50/50 ANTIFREEZE.

THIS MOTOR DOES NOT OVERHEAT AND WITH THE FAN ON HI,I CAN NOT GET ANY HEAT TO BLOW OUT FOR NEARLY 20 TO 30 MINS!
THEN AT BEST ITS LUKE WARM.BEFORE WITH DIESEL,I WAS SWEATING WITHIN 5 MINS AND CUTTING HEAT OFF! I CAN ALSO AFTER 10 MILES HARD DRIVING,STOP THE TRUCK AND POP THE RADIATOR CAP AND ONLY WARM VAPORS POUR OUT!! NO PRESSURE AT ALL! ITS ALMOST AS IF THE COOLANT SYSTEM IS NOT CIRCULATING THE WATER! I VE NEVER SEEN THIS BEFORE IN ALL MY ENGINE SWAPS!!I AM LOST, PLEASE GIVE ME SOME INFO ON THIS ONE!!!

 

[cliffyp]

Is the thermostat opening?

 

[hokie8358]

As far as i know it is! It was one of the brand new ones from o'reilys,that when it goes bad it locks open.

 

[woodywood]

get a new thermostat.stay away from the ones that lock open when you take it out you will find it is locked open therefor not allowing the engine to heat up also i would use a 190

 

[cliffyp]

I've heard horror stories about the ones from the parts stores. Go to the dealership.

 

[richingalveston]

Test your thermostat with a pot of boiling water so you can see if it is functional before wasting a trip to the store.

 

[hokie8358]

Ya good deal i will try all that in the a.m saturday! Someone also suggested that the impellar on the water pump may be trashed and not pumping! That is the original pump that came with motor! I ve not checked it yet!

 

[cpf240]

Please don't SHOUT. Thank You.

 

[hokie8358]

I ll try not too! Hate working on something and then at the end of project when you think your done, you end up with 5 more problems to solve!!! Lol

 

[mudman]

Remove the two hoses that run to the heater core. Use a garden hose on low speed on one of the removed hoses, see if water will run though the core. Reverse the garden hose and see how much crap comes out. Do this several times back and forth. You be shocked how much stuff is stuck in there. Also as you do this speed up the garden hose each time. Becareful not the damage the heater core itself. Did you put in a new Radiator too? You will need atleast a 190 degree thermostat as Woody said, if not a 210. some reason it's not getting to Operating temperature and not sharing it with th carb.!!

 

[hlcrkfrm]

You might check the radiator cap it could be bad. That's why you have no pressure.

 

[Warthog]

A couple of things. Do you have the correct water pump? There are clockwise and counter clockwise pumps. Belts or serpentine? Are heater hoses hooked up correctly?

Im with the others. Sounds like a bad thermostat.

 

[wilogger]

I replaced the thermostat in my dads Mack this fall, it worked 2 days and then stuck shut, Mack gave us a new one and said it happens ever since they started getting them from China! Don't think just cause u get a new part that it's good unfortunately.

 

[hokie8358]

did not get a chance to check it out. was working on the other 1028 thats diesel! glow plug issue,go figure!
yes, its a 85 model 454 block and was a v-belt set-up! i am going to pull stuff and check everything! yae, radiator cap was new also!

 

[woodywood]

its not your water pump if so that big iron would be cooking in about 10 minutes!

 

[o1951]

its not your water pump if so that big iron would be cooking in about 10 minutes!

And there would be Lots of pressure at the radiator cap, to say the least! Steam builds pressure

 

[hokie8358]

lot of trash did come out of the heater core, when backflushed with water from hose. the el-cheapo thermastat was the culprit!!! waste of cash on these chinese co salled new junk parts!!! live and learn i guess!!! thanks for all replys!!!

 

[mudman]

Hokie;
Now your heater core will really work when you get everything working...Good Job!

Ken