1995 GMC Safari No Heat

N.KOZIARA

MEMBER
1995 GMC SAFARI
6 CYL
2WD
AUTOMATIC
112,200 MILES

My car gets no heat unless I am traveling at high speeds for about 10 min. My temp Gauge reads high 235, once the van runs for a while but does not overheat or change performance. I changed the thermostat, but still no change, I was told it could be my water pump, or my heater core is cloged. I see no leaks under van overnight. Also, coolant in reservour doesnt change much when van is hot. What do you think it could be?

Sunday, January 10th, 2010 AT 3:58 PM

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Retest the thermostat if okay -Could be a clogged-up radiator and heater core to include air in the system-If its the water pump it will start to overheat within 10mins

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Sunday, January 10th, 2010 AT 4:36 PM

N.KOZIARA

MEMBER
2 POSTS

The temp runs high, but I drove 40 min. On highway, no smoke no change in performance, I think it may be a clogged heater core, I've heard it is possible to use a garden hose to flush it out, have you ever heard this?

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Monday, January 11th, 2010 AT 8:16 AM

RASMATAZ

MECHANIC
75,992 POSTS

Try flushing it out and also check if it has a heater control valve and check that too-or could very well be a door problem with air mix/blend/mode, vacuum and actuator and the HVAC contol module

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Monday, January 11th, 2010 AT 9:18 AM