1991 GMC Sierra "hot" Questions

myheaterwont blow hot air when i turn on heat it dont blow hot air Hi Dennis, I'm glad to help! Dennis, sense I'm not there to actually do diagnostics I'll tell you some things you can check and ...

Heater no hot air Doesn't blow hot air Your thermostat could be staying open,not letting the coolant to get hot,or your heater core is bad,usually leaking by driver side floor board.

...most likely problems? fuse is good, checked fuel pump relay, when key is on, only one wire of 5 is hot. CHECK FUEL PUMP WIRING.IT HAS A SHORT IN IT. Relays require two hot wires one to energize the ...

HEATING PROBLEMS MY HEATER BLOWS HOT THEN TURNS COLD WHEN I SHUT TRUCK OFF THEN START RIGHT BACK UP THE HEAT WILL BE HOT FOR ABOUT 5 MIN THEN TURN BACK COLD IF I TAKE RADITOR CAP IT WILL BLOW HOT WHEN

when I turn my 2002 Sierra on with the key and the heater dial was left in the hot (red) postion when turned off. The heater still blows constant hot air even when heater dial has been moved back to ...

1998 gmc hard to start my 1998 gmc k2500 5.7 engine is hard to start when hot, it starts fine 1st thing in the morn then will crank alot after warmed up. no codes set, fuel pressure is 60+, put a new ...

...cold air. Find the two heater hoses going through the firewall to the heater core both need to be hot at operating temp. If both are hot the problem will be inside with the heater control. I only ...

I have 2003 GMCHD 2500 and the heater is not blowing hot air, turned off the truck and started it again and it will blow hot for 5 seconds and turn to cold again. have you come across this problem ...

Starting problems when engine is hot My truck is hard to start when engine is hot. What could be the problem? Weak started windings...this use to happen alot with GM/Chevy trucks. Your starter may ...

Heater was putting out hot air this morning, then it started blowing cooler air, I checked the heater hoses. Supply to heater was hot, return hose was pretty warm but not hot like supply. losing any ...