The mystery of the overheating D1
- Thread starter Haywood
- Start date
How is the effect from the voltage? Will the temp gauge goes up when the voltage is higher?
How is the effect from the voltage? Will the temp gauge goes up when the voltage is higher?
in the ETM in section B1 page 10 is the answer you seek .
in the ETM in section B1 page 10 is the answer you seek .
Someone mentioned this, but make sure the system stays under pressure. That expansion tank cap gets gunked up and stays open, especially if the PO put tap water in it. System is 15psig and stops the fluid boiling. Also, turn on AC and see if the electric fans kick on. They should also come on when heading to overtemp.
Smell the expansion tank, while a quick pressure test may not show a small head gasket leak, unless its a blowdown test, you can smell exhaust gas in the expansion tank and there would be your heat source.
Smell the expansion tank, while a quick pressure test may not show a small head gasket leak, unless its a blowdown test, you can smell exhaust gas in the expansion tank and there would be your heat source.
Good call.
I wanted to update those following this thread, it looks like I have solved my problem(s).
I had two things going on. One was that my reservoir tank cap was not working, it was letting pressure through at very low pressures. New cap now and no more bubbling or coolant being pushed out of the tank.
The other issue was my brand new fan clutch was just not pulling enough air through my new radiator. So I replaced my brand new fan clutch with a BRAND-brand new fan clutch that was rated as 'severe duty', and now my temps sit right where they should be.
Of course the severe duty fan clutch is locked up a majority of the time so there is more fan noise, but that is a small price to pay.
Here is the one I bought. It fits perfect and sits a bit closer to the rad. The only mod was to open the 8mm holes on the fan to closer to 10mm to bolt to the clutch.
http://shop.advanceautoparts.com/p/carquest-fan-clutch-severe-duty-215158/19230027-P
The water pump is easy to replace, so you can live with having to do it occasionally.
Fan blades closer to the radiator is not a good thing, however.
Fan blades closer to the radiator is not a good thing, however.
Those severe duty clutches are scary. I had one on my truck for about 45 seconds before I took it out. It spun the fan up to speeds WAY higher than that plastic was designed to go.... and it wasn't just when the motor was hot. It was all the time.
From recent experience I believe this is a bigger deal than most give it credit for. The position of the fan blades relative to the opening of the shroud matters quite a bit. You can have a more aggressive clutch, but if it isn't positioned properly, it will be less effective. Similarly a less aggressive clutch can work better for the same reasons.
My truck was consistently running up to 220 to 230 in traffic, replaced Clutch (HD, a bit louder), T-stat, water pump, now it likes to stay 195 to 210 max (in a hot day, in traffic, with the AC running