95 brave 454 running hot on long hills

Well i replaced water pump and fanclutch and know the problem is gone thanks againfor all the advice.

Bumpyroad wrote:

tropical36 wrote:

craigspeer2001 wrote:
I just started getting this problem the last time we were out on a trip on a long hill it wants to start climbing in temp not boiling over but enough to make you worry. I thought bottom hose might be sucking shut change both and bypass new radiator last year fan clutch feels ok. Im open for suggestions so i dont spend a bundle on swapping parts thanks.

Take a look at a National product and see how they put curtains on each side of the engine, thereby directing the air flow over the exhaust manifold and plug wires. I've noticed a tremendous difference in our now National vs our old Fleetwood. Biggest problem with most is to what's happening with the transmission temp. and one should probably have a gauge installed, since most chassis and/or coach manufactures never deemed it important. Hopefully the ECM on the later ones will send the rig into limp mode long before there's any damage to the transmission on heavy hard pulls and I can say that our coach doesn't like the Jeep back there during steep long pulls. Otherwise it's fine in mountain terrain, including the Rockies.

it wasn't just National products. Camping World used to sell add on kits to deflect air over the exhaust manifolds. just another "issue" with the P-30/32 chassis.
bumpy

I think it was more of how the house was built on the chassis, rather than the P32 itself and you won't hear of many National owners complaining of overheating and burning spark plug wires as per say.

tropical36 wrote:

craigspeer2001 wrote:
I just started getting this problem the last time we were out on a trip on a long hill it wants to start climbing in temp not boiling over but enough to make you worry. I thought bottom hose might be sucking shut change both and bypass new radiator last year fan clutch feels ok. Im open for suggestions so i dont spend a bundle on swapping parts thanks.

Take a look at a National product and see how they put curtains on each side of the engine, thereby directing the air flow over the exhaust manifold and plug wires. I've noticed a tremendous difference in our now National vs our old Fleetwood. Biggest problem with most is to what's happening with the transmission temp. and one should probably have a gauge installed, since most chassis and/or coach manufactures never deemed it important. Hopefully the ECM on the later ones will send the rig into limp mode long before there's any damage to the transmission on heavy hard pulls and I can say that our coach doesn't like the Jeep back there during steep long pulls. Otherwise it's fine in mountain terrain, including the Rockies.

it wasn't just National products. Camping World used to sell add on kits to deflect air over the exhaust manifolds. just another "issue" with the P-30/32 chassis.
bumpy

Well i replaced the fan clutch and water pump tonight and problem is gone thanks for all the advice.

Clay L wrote:
According to the service manual - for the 95 model year the fan is activated in two ways.
There is a coolant sensor in the block and a high pressure switch in the AC - either one can turn it on.

It does not come on just because the AC is on.

You are right. I was going by memory, and I think I was going on info from an earlier year. (car)

A partially plugged radiator will cause that problem. When you are climbing long grades your engine is putting out lots of heat and the radiator can't dissipate it. A good radiator shop should be able to diagnose it quickly. Getting it out is an other issue, isn't easy I have done it twice, some coaches are easier than others.

I just noted that you have already replaced you radiator.

craigspeer2001 wrote:
I just started getting this problem the last time we were out on a trip on a long hill it wants to start climbing in temp not boiling over but enough to make you worry. I thought bottom hose might be sucking shut change both and bypass new radiator last year fan clutch feels ok. Im open for suggestions so i dont spend a bundle on swapping parts thanks.

Take a look at a National product and see how they put curtains on each side of the engine, thereby directing the air flow over the exhaust manifold and plug wires. I've noticed a tremendous difference in our now National vs our old Fleetwood. Biggest problem with most is to what's happening with the transmission temp. and one should probably have a gauge installed, since most chassis and/or coach manufactures never deemed it important. Hopefully the ECM on the later ones will send the rig into limp mode long before there's any damage to the transmission on heavy hard pulls and I can say that our coach doesn't like the Jeep back there during steep long pulls. Otherwise it's fine in mountain terrain, including the Rockies.

According to the service manual - for the 95 model year the electric fan is activated in two ways.
There is a coolant sensor in the block and a high pressure switch in the AC - either one can turn it on.

It does not come on just because the AC is on.

On our 93 Winnebago 454 we had the same problem climbing hills in Vermont. I switched from dino to Mobil 1 and dropped the temp down considerably. It's been so long since I had the Winny that I can't remember the actual temps.

The other thing that we did was to install Doug Thorley headers. This gave us a much improved performance and improved the MPG by almost 20% by keeping the gas pedal out of the firewall. We drove it from Mass to San Jose CA with absolutely no overheating.

You should hear the fan clutch energize when you firast start the rig. It will reduce in noise after a few minutes.