AC Removal= overheating?

cameronsclone

cameronsclone

New member
I removed my a/c, heater, and blower motor this past week. The 2 lines coming from under the blower motor (copper pipes with heater hose in engine bay) were cut and shut off, and I rerouted the heater hose on them so the one coming from the block goes directly to the radiator. All was removed fine and dandy. But for some reason my truck has started overheating lately. Well, maybe not exactly overheating. Before I did the a/c and before I let the truck sit for a month or so it was running under the 1/4 mark on the temp gauge in 80-90* weather, until i started boosting a lot then it would go to just above the 1/4 mark, but never up to the half mark. Now that I've started playing with it and driving it around, it has gotten up to the 1/4 mark regularly with easy driving, then getting above the half mark when even barely getting into the gas. All I changed besides rerouting the heater hose previously mentioned was switching from straight water and water wetter in the rad to 50/50 water and antifreeze, along with a bottle of water wetter. Any thoughts on how this could happen? The efan seems to be pulling air well enough, all though it does sound a lil different then it did before. I'm thinking thats just because I havent heard it run or anything for so long. Tonight I'll take out the tstat and run it with none in there to see if that makes a difference. I'll have to check with some hot water to see if its stuck.
 
cameronsclone

cameronsclone

New member
Re: AC Removal= overheating?

So instead of connecting the block and radiator with the small heater hose, I need to just block both holes off? I flushed it twice and refilled it twice, no bubbles in there.
 
gkrcr882

gkrcr882

SyTyless......for now!
Re: AC Removal= overheating?

You should be able to connect the hoses (together) that went to the heater core and be done with it, since in reality thats how they were set up, only with the heater core in series. Burp the cooling system well and use a tester to see what your ratio is: too much coolant = overheating. Make sure there's no fuzz or crap in the radiator and that the fins aren't smashed. Also check the thermostat, as previously mentioned, it might be shot.
 
0966Sy

0966Sy

Code what?
Re: AC Removal= overheating?

Change the thermostat and put a plug in the manifold and cap the radiator port. keeping a hose there without the heater core can allow to much flow in the cooling system preventing the thermostat to not open completely. Check for coolent leaks and level, ok?
Rev the engine and hold at 1500-2000 RPM after cold start to warm engine. rev from throttle linkage at TB. keep radiator cap off to check flow of pump once thermostat opens.
thermostat is open if the upper radiator hose is to hot to hold hand around once guage reach's operating temp. You also need to know what temp t-stat.
 
SY2455

SY2455

70's Veteran
Re: AC Removal= overheating?

cameronsclone said:
I rerouted the heater hose on them so the one coming from the block goes directly to the radiator. All was removed fine and dandy. But for some reason my truck has started overheating lately.
Click to expand...

This in Itaic and underline is why you are overheating. This is heated water that is always by passing the radiator. You must block both of these off.
 
Ian Turgeon

Ian Turgeon

Cascading Inspiration
Re: AC Removal= overheating?

agreed, either block them both off, or simply connect the ends of the old hoses together (stock minus the heatercore)
 
Don W.

Don W.

Stab it and steer it
Re: AC Removal= overheating?

Since, as has been mentioned, looping the hoses together is the same as leaving the heater core in I don't think that's your problem. However plugging them won't hurt and will serve to confirm if that's the prob. You could always just pinch that hose shut with some vice-grips as a test.

With engine completely cold check that the rad (not header tank) is full. Check t-stat. Rev engine and watch lower rad hose. Dose it collapse?
 
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