Did a search, but did not find answer? My car is a '48 DeSoto, 392 Hemi (mild cam, nothing radical), 727TF auto ******. The temp on the highway is fine, 160-180 regardless of outside temp. My problem is sitting still/idling, temp rises quickly. I have aluminum radiator, stock fan, plus pusher fan in front of the radiator. I am hearing for and against the pusher fan. I am hearing that the two are working against each other? Any opinions, or similiar experiences? Thanks for help. Jackie
Do you have a radiator shroud? Plus getting your stock fan the right distance from the radiator. I had a similiar problem, stock 4 blade chevy fan sitting way to far back from the radiator. Solved it by spacing up a 6 blade fan with a shrould. There was a thread on here about how to make a shroud out of fibergl***.
I just fixed a heating problem on a non hamb friendly car with a pusher and puller fan. The pusher fan when not operating was still turning slowly but turning do to air flow across the blades. This was adding to the heating problem. Removed the pusher and then it ran cooler but still not cool enough. The heat gun across the radiator found 1/4 of it not transfering heat "plugged tubes" so the radiator was replaced and all was good again. Yours isn't running hot at high speeds so your problem will either be solved with a high flow water pump or better fan with shroud on the engine side....remove the pusher.
I have pusher with shroud and no factory fan off of the motor. Cools great in this Texas HEAT. Do you have the electric fan on a temp sensor?. What size radiator? Clutch on the fan from the motor?
Personally I run mine without a temp sensor, but it gets pretty warm down here. How about thermostat - what temp do you have in it.? What dimensions on your radiator (Finned Cooling Area)? Most electric fans come in the box as pullers and you have to reverse the blade and the polarity on the wiring to make it a pusher. Was yours this way? The fans should be working together if set up right. Do you have a shroud for the electric fan or the factory fan? When I put the shroud on my electric fan it made a huge difference. I was having problems simular to yours.
160 Thermostat. I don't remember about having to change the fan. As best I remember, was bought as a pusher, with small built on shroud. I am thinking (dangerous), since engine compartment so tight, I need to find a way to get some of the heat from under the hood? Which Camaro had the hood "scoops" that were retangular, with ports (I think 4 on each) and one on each side of the hood. Were these "scoops" show only, or were they functional? Jackie
I would double check electric fan and confirm which way the air is flowing. There is some truth to the fact that the electric fan will cause air flow problems if it is just sitting there not running - it will obstruct air flow. It needs to be running and I would still suggest getting rid of the temp sensor right now (byp***) to see what difference is made. Do you have any pics?
Pictures?? Well no, but shuckins', I guess I can take some. You want pictures of the cooloing set up, I ***ume? Jackie
Way back when, with problems similar to yours, we found that air was not moving through the engine compartment. Install all of the fans you want but if the air cannot escape then.... On some o/t cars we (temporarily) jacked up the back of the hood to create a 1" gap. If that solved the issue then we had to get creative. .
Thats what I am thinking, since problem happens when sitting still, idling, and not going down the road. I am looking for someway to get heat from under the hood. Some kind of louvers or scoop at rear of the hood. Any suggestions, keeping in mind, car recently painted. Do not mind cutting hole in hood, but can not afford to repaint. Jackie
Your mechanical fan should 3/4-1" from the radiator core unless it has a shroud. With a shroud the fan should be centered in the opening front to back. Remove the pusher fan from the front of the radiator, see if it can be reverese wired and made into a puller and use it on something else. Make sure your factory draft panels around the radiator are sealing against the radiator and guiding all the air into the core on the sides, bottom and top.
I have a pusher that runs constantly when key is on and also a thermostatically controlled puller, and mine will creep upwards to about 210 - 220 if I sit long enough. I've been told by some builder friends to not use a pusher with a puller. Why not disconnect your pusher to see if it makes a difference. If not reconnect it.
I think you are on the right track in thinking that the air is having trouble escaping. Have seen this same scenario in V8 S10's, the only one I ever saw who's owner said it always ran cool: Had no inner fenders! Also; the suggestion of unhooking the pusher as an experiment, that wouldn't do away with the impediment to airflow the inoperative fan would surely produce.
I'm trying. I am not very 'puter smart, rather 'puter challenged. I took the pictures, downloaded to the computer, but as yet unable to post to HAMB. Please, keep checking back, I'm still trying .
Sometimes running a little more timing advance cools things done at idle and richen idle circuit up helps some.
Trying again Should have spaced between, but click on image to inlarge. Thanks Hambers for your help, and patience.
It looks like the shroud only goes half way around the fan an it also would be a lot more effective if it covered the entire core. I would think if you went with the biggest fan that would fit, kept it as far from the radiator as possible and built a new shroud that covers the entire core tapering towards the fan, you would do a lot better. You might have to move the radiator forward some to do this though.
That's what I'd suggest. Also the shroud goes back too far now, if it only covers about 1/2 or 2/3 of the fan blades it would probably move more air.
No naked picture of my wife and girlfriend I can share, but hope this will be OK. The 2nd one in line (tatoo sticking from top of bikini), my wife. Girlfriend is the one behind her in the small white bikini Now back to my heating situation . Thank You, Jackie
So, you are saying, less is more in this situation? Before my addition, it covered all of the fan. Maybe I will give your suggestion a try, nothing to lose. Thanks, Jackie
You need a shroud that covers the entire core and tapers back like a funnel to the fan. When you are going down the road air is forced through all of the radiator. When you are sitting still, the fan only pulls air from the center of the radiator due to the shroud only covering the center.
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