Need help on diagnosis on engin hot problem.

来源: wimax88 于 2009-10-13 16:48:55 [] [旧帖] [给我悄悄话] 阅读数 : (862 bytes)

The car is Mazda 626, 1995 with manual transmission. After running for 10 minutes, the engine becomes hot. The temperature is not consistently very high, sometimes it goes back close to normal. I checked cooling fan a few times, the fan always works. It does not look like temperature sensor is faulty. Because when the car just starts, the indicator shows low temperature, which gradually increases as car is running. The temperature stays at normal for a while, then goes higher. I changed thermostat, but found when engine was hot, the coolant hose with thermostat was still cold. So I changed to another thermostat, and found the same thing happening. Now, I am thinking maybe water pump does not work, and coolant does not circulate. so even when thermostat opens, the hot coolant does not flow, and this hose is still cold. Does this sound right? Thanks.

所有跟帖： 

• Make sure thermostat installed in correct orientation -cire622- ♂ 给 cire622 发送悄悄话 (583 bytes) () 10/13/2009 postreply 17:37:49

• Several things -biglow- ♂ 给 biglow 发送悄悄话 biglow 的博客首页 (296 bytes) () 10/13/2009 postreply 18:01:46

• I have checked and here is the facts: -wimax88- ♂ 给 wimax88 发送悄悄话 (217 bytes) () 10/13/2009 postreply 18:25:20

• put a new water pump if no coolant lost. plastic blades of water -fixanycars- ♀ 给 fixanycars 发送悄悄话 fixanycars 的博客首页 (91 bytes) () 10/13/2009 postreply 18:50:45

• Then open the radiator cap and observe the liquid flow -biglow- ♂ 给 biglow 发送悄悄话 biglow 的博客首页 (169 bytes) () 10/13/2009 postreply 20:43:47

• when the engine is hot, turn on the heater fan -xxhhwxc- ♂ 给 xxhhwxc 发送悄悄话 (81 bytes) () 10/14/2009 postreply 07:09:30

• Second xxhhwxc that logged radiator sounds more likely. -QYZ- ♂ 给 QYZ 发送悄悄话 (549 bytes) () 10/14/2009 postreply 07:40:37

• this radiator has been changed about 4 to 5 yes ago. -wimax88- ♂ 给 wimax88 发送悄悄话 (285 bytes) () 10/14/2009 postreply 08:58:22

• Thanks everyone for your ideas. I plan to take the car -wimax88- ♂ 给 wimax88 发送悄悄话 (64 bytes) () 10/14/2009 postreply 09:00:28

• 很简单 -润涛阎- ♂ 给 润涛阎 发送悄悄话 润涛阎 的博客首页 (184 bytes) () 10/14/2009 postreply 17:39:28

• if冷却水流入气缸一小部分, you should see white smoke from the tail pipe. -QYZ- ♂ 给 QYZ 发送悄悄话 (0 bytes) () 10/14/2009 postreply 19:18:41

• 他的情况是：高压把气体压入冷却水，而冷却水的压力不足以 -润涛阎- ♂ 给 润涛阎 发送悄悄话 润涛阎 的博客首页 (256 bytes) () 10/14/2009 postreply 19:26:10

• Then why coolant does not return to radiator through thermostat? -wimax88- ♂ 给 wimax88 发送悄悄话 (0 bytes) () 10/15/2009 postreply 08:53:42

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