chadn70

Last week I installed a new waterpump on my 89 5.0. While I was at it, I thought it would be a good time to install some BBK underdrive pulleys. The pulleys state no change in water flow, amps, etc. but I found out different. Stop and go traffic the heat stays warm, but a 30 mile highway ride at 65 mph the heat gets cooler, and cooler the further you go. I watched my temp guage and it stayed steady. Is this the norm with underdrive pulleys?

FORD TOUGH

It is probably because of the UDP's. I know that foxes have problem with charging with UDP's. Did you purge the cooling system?

chadn70

Yes, I even drilled a small hole in top of the thermostat.

FORD TOUGH

It's probably the pulleys then. You may want to try the old pulleys and see if it goes away.

302army187

are you saying the car gets colder and colder as you drive on the highway?

im not understanding what your saying.....


yes, underdrive pulleys normally cause more issues then they do good results.

my car had would over heat in mild traffic, and not charge properly.

so i swaped the OEM alternator pulley back on, and installed a electric fan.

Timspony

I'm no fan of UD pullies! ...can make better use of my $$$ in other way! ...car should run a little hotter around town, normal!

1BIGMOFO

^ i agree with Tim

wildsurfer92

Never had any problems with my U/D pulleys aside from low charging while im stopped, but everything still works fine

silver91gt

I had the march pulleys and used all but the alternator pulley, it did run a little warmer,
I put the stock water pump pulley back on and only used the crank pulley.

wowvfast

I don't agree with tim...*L*

if you still have the old clutch fan I bet the clutch is wore out.....I would just use the crank pulley as this is where most of the power is from...it's not the pulleys fault we have a low amp alt in these cars...I use one from a f150 with an auto with the full set and no heating up, no electrical issues..
what these pulleys do alot of time is expose a exsisting issues