98 Mazda B4000 (4.0L) Upper Radiator Hose HOT Lower COLD ??

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ndccpf1@gmail.com - 25 Oct 2006 01:10 GMT

Upper (left) big hose is HOT and the lower (bottom Right) hose and
radiator is COLD after driving for 1/2 hour. Temp gauge always on COLD.
My water pump ?

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John S. - 25 Oct 2006 01:18 GMT

ndcc...@gmail.com wrote:

> Upper (left) big hose is HOT and the lower (bottom Right) hose and
> radiator is COLD after driving for 1/2 hour. Temp gauge always on COLD.
> My water pump ?

Check the thermostat first.

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Mike Romain - 25 Oct 2006 15:25 GMT

That sounds like the radiator is very efficient. I would suspect a bad
thermostat not allowing the engine to actually warm up. This usually
goes hand in hand with little or no heat inside the vehicle and poor
mileage.

If you have tons of interior heat and the gas mileage hasn't started to
get bad, then I would suspect a bad temperature sender.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
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> Upper (left) big hose is HOT and the lower (bottom Right) hose and
> radiator is COLD after driving for 1/2 hour. Temp gauge always on COLD.
> My water pump ?

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ndccpf1@gmail.com - 29 Oct 2006 11:25 GMT

Replaced the THERMOSTAT and the temp guage is back to normal and LOTS
of HEAT inside the interior now :)

Only thing is the temperature control can't select cool temps (it did
for a minute)...only HOT air.

> Upper (left) big hose is HOT and the lower (bottom Right) hose and
> radiator is COLD after driving for 1/2 hour. Temp gauge always on COLD.
> My water pump ?

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